Eckhardt Advances in Turbulence XII

Proceedings of the 12th EUROMECH European Turbulence Conference, September 7-10, 2009, Marburg, Germany
2009
ISBN: 978-3-642-03085-7
Verlag: Springer
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, Band 132, 913 Seiten

Reihe: Springer Proceedings in Physics

This volume comprises the communications presented at the EUROMECH European Turbulence Conference ETC12, held in Marburg in September 2009. The topics covered by the meeting include: Acoustics of turbulent flows, Atmospheric turbulence, Control of turbulent flows, Geophysical and astrophysical turbulence, Instability and transition, Intermittency and scaling, Large eddy simulation and related techniques, Lagrangian aspects, MHD turbulence, Reacting and compressible turbulence, Transport and mixing, Turbulence in multiphase and non-Newtonian flows, Vortex dynamics and structure, formation, Wall bounded flows.

Autoren/Hrsg.

Eckhardt, Bruno

Inhaltsverzeichnis

1;Advances in Turbulence XII;3
1.1;Preface;5
1.2;Contents;7
1.3;Part I Lagrangian aspects;28
1.3.1;Lagrangian modeling and properties of particles with inertia;29
1.3.1.1;1 Lagrangian structure functions;31
1.3.1.2;2 Finite particle size;33
1.3.1.3;3 Conclusions;34
1.3.1.4;References;35
1.3.2;Effect of Fax´en forces on acceleration statisticsof material particles in turbulent flow;37
1.3.2.1;Lagrangian models for particle dynamics;37
1.3.2.2;Eulerian-Lagrangian Numerical simulations;38
1.3.2.3;Results;38
1.3.2.4;References;40
1.3.3;Lagrangian analysis of turbulent convection;41
1.3.3.1;1 Introduction;41
1.3.3.2;2 Lagrangian particle dispersion;41
1.3.3.3;3 Heat transport and acceleration;42
1.3.3.4;References;44
1.3.4;Linear and angular dynamics of an inertial particle in turbulence;45
1.3.4.1;Experimental setup and method;45
1.3.4.2;Linear motion;46
1.3.4.3;Angular dynamics;47
1.3.4.4;References;48
1.3.5;Collision rate between heavy particles in a model turbulent flow;49
1.3.5.1;1 Introduction;49
1.3.5.2;2 Direct measurements;50
1.3.5.3;3 Indirect estimation;51
1.3.5.4;References;52
1.3.6;From cloud condensation nuclei to cloud droplets: a turbulent model;53
1.3.6.1;Introduction;53
1.3.6.2;Model;54
1.3.6.3;Results;55
1.3.6.4;References;55
1.3.7;Lagrangian statistics of inertial particles in turbulent flow;57
1.3.7.1;References;60
1.3.8;Lagrangian statistics of two–dimensional turbulence in a square container;61
1.3.8.1;References;64
1.3.9;Measurement of Lagrangian Particle Trajectories by Digital in-line Holography;65
1.3.9.1;1 Introduction;65
1.3.9.2;2 Hologram recording and reconstruction;66
1.3.9.3;3 Particle detection, validation and tracking;67
1.3.9.4;4 Conclusions;67
1.3.9.5;References;68
1.3.10;3-D Particle Tracking Velocimetry (PTV) in gas flows using coloured tracer particles;69
1.3.10.1;References;72
1.3.11;Two-particle dispersion in 2D inverse cascadeturbulence and its telegraph equation model;73
1.3.11.1;1 Introduction;73
1.3.11.2;2 Results and Discussion;74
1.3.11.3;References;76
1.3.12;Numerical simulations of particle dispersion in stratfied flows;77
1.3.12.1;1 introduction;77
1.3.12.2;2 Numerical simulations and results;78
1.3.12.3;3 Conclusions;80
1.3.12.4;References;81
1.4;Part II Instability and Transition;82
1.4.1;Experimental study of the von Kármán flow from Re = 102 to 106: spontaneous symmetry breaking and turbulent bifurcations;83
1.4.1.1;1 Effect of the Reynolds number: onset of multistability;84
1.4.1.2;2 Controlled Rp-symmetry breaking;85
1.4.1.3;3 Conclusion;86
1.4.1.4;References;86
1.4.2;Flow reversals in a vertical channel;87
1.4.2.1;References;89
1.4.3;Linear Instability of Streamwise Corner Flow;90
1.4.3.1;References;93
1.4.4;DNS of turbulent plane Couette flow with emphasis on turbulent stripe;94
1.4.4.1;1 Introduction;94
1.4.4.2;2 Numerical conditions;94
1.4.4.3;3 Results and discussion;95
1.4.4.4;4 Conclusion;97
1.4.4.5;References;97
1.4.5;Geometry of state space in plane Couette flow;98
1.4.5.1;References;101
1.4.6;Linear and nonlinear instabilities of slidingCouette flow;102
1.4.6.1;1 Introduction;102
1.4.6.2;2 Formulation and Numerical Methods;103
1.4.6.3;3 Results and Discussion;103
1.4.6.3.1;3.1 Linear Analysis;103
1.4.6.3.2;3.2 Nonlinear analysis;103
1.4.6.4;References;105
1.4.7;Localization in plane Couette edge dynamics;106
1.4.7.1;References;107
1.4.8;Nonlinear optimal perturbations in plane Couette flow;108
1.4.8.1;References;111
1.4.9;Order parameter in laminar-turbulent patterns;112
1.4.9.1;References;113
1.4.10;Pattern formation in low Reynolds number plane Couette flow;115
1.4.10.1;References;118
1.4.11;Quasi-stationary and chaotic convection in lowrotating spherical shells;119
1.4.11.1;References;121
1.4.12;Linear stability of 2D rough channels;124
1.4.12.1;1 Introduction;124
1.4.12.2;2 Results;125
1.4.12.3;3 Conclusions;127
1.4.12.4;4 References;127
1.4.13;Transient turbulent bursting in enclosed flows;128
1.4.13.1;1 Introduction;128
1.4.13.2;2 Experimental setup;128
1.4.13.3;3 Results;129
1.4.13.4;4 Conclusion and outlook;131
1.4.13.5;References;131
1.4.14;On New Localized Vortex Solutions in the Couette-Ekman Layer;132
1.4.14.1;References;135
1.4.15;Shear instabilities in Taylor-Couette flow;136
1.4.15.1;1 Formulation;136
1.4.15.2;2 Subcritical equilibria from modal instabilities of Couette flow;137
1.4.15.3;3 Intermittent regimes from nonmodal instabilities;138
1.4.15.4;References;139
1.4.16;Particle Tracking Velocimetry in Transitional Plane Couette Flow;140
1.4.16.1;References;143
1.4.17;Experimental study of coherent structures in turbulent pipe flow;144
1.4.17.1;References;145
1.4.18;Forced localized turbulence in pipe flows;146
1.4.18.1;1 Introduction;146
1.4.18.2;2 Formulation;146
1.4.18.3;3 The turbulent puff: mean flow;147
1.4.18.4;4 Localized forcing;148
1.4.18.5;References;149
1.4.19;From localized to expanding turbulence;150
1.4.19.1;References;151
1.4.20;Influence of test-rigs on the laminar-to-turbulent transition of pipe flows;152
1.4.20.1;Abstract;152
1.4.20.2;1 Introduction and Aim of Work;152
1.4.20.3;2 Effects of Nozzle on Pipe Inlet Turbulence;154
1.4.20.4;3 Design Strategy for New Test Rig and Experiments;154
1.4.20.5;References;155
1.4.21;Interaction of turbulent spots in pipe flow;156
1.4.21.1;References;157
1.4.22;Large-scale transitional dynamics in pipe flow;158
1.4.22.1;References;161
1.4.23;Nonlinear coherent structures in a square duct;162
1.4.23.1;Introduction;162
1.4.23.2;Definitions;162
1.4.23.3;Results;163
1.4.23.4;Conclusions;164
1.4.23.5;References;165
1.4.24;Quantitative measurement of the life time ofturbulence in pipe flow;166
1.4.24.1;References;169
1.4.25;Experimental investigation of turbulent patch evolution in spatially steady boundary layers;170
1.4.25.1;References;171
1.4.26;Interaction of noise disturbances and streamwise streaks;172
1.4.26.1;References;175
1.4.27;Linear generation of multiple time scales by 3D unstable perturbations;176
1.4.27.1;References;179
1.4.28;Convection at very high Rayleigh number: signature of transition from a micro-thermometer inside the flow;180
1.4.28.1;1 Introduction;180
1.4.28.2;2 Micron-size thermometer;180
1.4.28.3;3 Results and interpretation;182
1.4.28.4;4 Conclusion;183
1.4.28.5;References;183
1.4.29;Estimating local instabilities for irregular flows in the differentially heated rotating annulus;184
1.4.29.1;1 Introduction;184
1.4.29.2;2 Motivation and test case;184
1.4.29.2.1;2.1 Growing modes in stable systems;184
1.4.29.2.2;2.2 Estimating the propagator from data;185
1.4.29.3;3 Thermally driven rotating annulus;186
1.4.29.3.1;3.1 Estimating growing patterns of the rotating annulus flow;187
1.4.29.4;4 Conclusion and future work;187
1.4.29.5;References;187
1.4.30;Search for the “ultimate state” in turbulent Rayleigh-B´enard convection;188
1.4.30.1;References;189
1.4.31;Rayleigh–Taylor instability in two dimensions and phase-field method;190
1.4.31.1;1 System configuration and phase-field description;190
1.4.31.2;2 Numerical investigation;192
1.4.31.3;3 Conclusions;193
1.4.31.4;References;193
1.4.32;Split energy cascade in quasi-2D turbulence;194
1.4.32.1;References;196
1.4.33;Stabililty and laminarisation of turbulent rotating channel flow;197
1.4.33.1;References;198
1.4.34;The vortical flow pattern exhibited by thechannel flow on a rotating system just pasttransition under the influence of the Coriolisforce;199
1.4.34.1;1 Introduction and scope of the work;199
1.4.34.2;2 The equations, the ansatz and the procedure for theirsolution;199
1.4.34.3;References;202
1.4.35;Transient evolution and high stratification scaling in horizontal mixing layers;203
1.4.35.1;1 Introduccion;203
1.4.35.2;2 Formulation and Methods;204
1.4.35.3;3 Results and Discussion;206
1.4.35.4;References;206
1.5;Part III Control of turbulent flows;207
1.5.1;Toward Cost-effective Control of Wall Turbulence for Skin Friction Drag Reduction;208
1.5.1.1;Abstract;208
1.5.1.2;1 Introduction;208
1.5.1.3;2 Fundamental Concepts;210
1.5.1.3.1;2.1 Control Performance Indices;210
1.5.1.3.2;2.2 Theoretical Constraint;211
1.5.1.3.3;2.3 Toward Control of High Reynolds Number Flows;212
1.5.1.4;3 Feedback Control;213
1.5.1.4.1;3.1 Control Algorithms with Wall Sensors;213
1.5.1.4.2;3.2 Power Saving with Selective Space/Scale Control;214
1.5.1.5;4 Predetermined Control;215
1.5.1.6;5 Conclusions and Challenges for the Future;218
1.5.1.7;Acknowledgements;218
1.5.1.8;References;219
1.5.2;Active control of turbulent boundary layer using an array of piezo-ceramic actuators;220
1.5.2.1;1 Introduction;220
1.5.2.2;2 Experimental Details;221
1.5.2.3;3 Results and Discussion;222
1.5.2.4;4 Conclusion;223
1.5.2.5;Acknowledgement;223
1.5.2.6;References;223
1.5.3;Flat plate turbulent boundary-layer control using vertical LEBUs;224
1.5.3.1;References;227
1.5.4;Estimation of the spanwise wall shear stress based on upstream information for wall turbulence control;228
1.5.4.1;References;231
1.5.5;Interactions between vortex generators and a flat plate boundary layer. Application to the control of separated flows.;232
1.5.5.1;References;235
1.5.6;Modulated global mode of a controlled wake;236
1.5.6.1;1 Introduction;236
1.5.6.2;2 Experiment;237
1.5.6.3;3 Results and discussion;237
1.5.6.4;4 Conclusion;239
1.5.6.5;5 Acknowledgements;239
1.5.6.6;References;239
1.5.7;Swirl effects in turbulent pipe flow;240
1.5.7.1;1 Introduction;240
1.5.7.2;2 Results;241
1.5.7.3;References;243
1.5.8;Control of an axisymmetric turbulent wake by a pulsed jet;244
1.5.8.1;1 Introduction;244
1.5.8.2;2 Experimental Setup;245
1.5.8.3;3 Results;245
1.5.8.4;4 Discussion;246
1.5.8.5;References;247
1.5.9;Direct Numerical Simulations of turbulent mixed convection in enclosures with heated obstacles;248
1.5.9.1;1 Introduction;248
1.5.9.2;2 Governing equations and numerical method;248
1.5.9.3;3 Results;250
1.5.9.4;4 Acknowledgements;251
1.5.9.5;References;251
1.5.10;On Drag Reduction in Turbulent Channel Flow over Superhydrophobic Surfaces;252
1.5.10.1;1 Introduction;252
1.5.10.2;2 Superhydrophobic surfaces;252
1.5.10.3;3 Experimental methods and determination of u*;253
1.5.10.4;4 Results and Discussion;254
1.5.10.5;References;255
1.5.11;Response of Periodically ModulatedTurbulence;256
1.5.11.1;References;258
1.5.12;Turbulent drag reduction by feedback: aWiener- ltering approach;259
1.5.12.1;References;263
1.6;Part IV Vortex dynamics and structure formation;265
1.6.1;A driving mechanism of turbulent puff in pipe flow;266
1.6.1.1;Introduction;266
1.6.1.2;DNS of Pipe Flow;266
1.6.1.3;Equilibrium puff;267
1.6.1.4;Low-speed streaks and KH instability;268
1.6.1.5;Self-Sustenance Cycle;269
1.6.1.6;References;269
1.6.2;Wavelet tools to study vortex burstingand turbulence production;270
1.6.2.1;Acknowledgements;271
1.6.2.2;References;273
1.6.3;The minimum-enstrophy principle for decaying 2D turbulence in circular domains;274
1.6.3.1;Introduction;274
1.6.3.2;Set-up of the numerical simulations;274
1.6.3.3;Decaying 2D turbulence: late-time flow patterns;275
1.6.3.4;Conclusions;277
1.6.3.5;References;277
1.6.4;Direct numerical simulation of a turbulent vortex ring;278
1.6.4.1;1 Introduction;278
1.6.4.2;2 Numerical procedure;278
1.6.4.3;3 Results;279
1.6.4.4;References;281
1.6.5;Reconnection of vortex bundles;282
1.6.5.1;References;285
1.6.6;Turbulent energy cascade caused by vortex stretching;286
1.6.6.1;References;289
1.6.7;Instabilities and transient growth of trailing vortices in stratified fluid;290
1.6.7.1;1 Introduction;290
1.6.7.2;2 2-D Evolution of the base flow in a stratified fluid;290
1.6.7.3;3 Quasy-steady approximation for the stability of theflow.;291
1.6.7.4;4 Optimal perturbations;292
1.6.7.5;References;293
1.6.8;mplementation of Vor tex Str etching into the T wo-Dimensional N avier -Stokes E quations via Ar bitr ar y E xter nal Str aining;294
1.6.8.1;1 Abstract;294
1.6.8.2;2 I ntr oduction and mathematical for mulation;294
1.6.8.3;3 Applications;296
1.6.8.3.1;3.1 Isotropic decaying turbulence;296
1.6.8.3.2;3.2 Near–wall flow;297
1.6.8.3.3;References;297
1.6.9;Turbulent cascade of a quantum fluid at finitetemperature;298
1.6.9.1;1 Introduction : Motivation and Model;298
1.6.9.2;2 Numerical aspects;299
1.6.9.3;3 Results;299
1.6.9.4;4 Conclusion;301
1.6.9.5;Acknowledgements;301
1.6.9.6;References;301
1.6.10;Visualization of quantum turbulence in 3He-B by thermal excitations;302
1.6.10.1;References;305
1.6.11;The 3D structure of a dipole in a shallow two-layer fluid;306
1.6.11.1;Introduction;306
1.6.11.2;Experimental and numerical results;307
1.6.11.3;Conclusions;309
1.6.11.4;Acknowledgments;309
1.6.11.5;References;309
1.6.12;The 3D character of decaying turbulence in a shallow fluid layer;310
1.6.12.1;1 Introduction;310
1.6.12.2;2 Laboratory experiments;310
1.6.12.3;3 Numerical comparison between 3D and 2D flows;312
1.6.12.4;4 Conclusion;313
1.6.12.5;References;313
1.6.13;Vortex dynamics in a Karman street behind a heated cylinder: defects and potentialities of acoustic diagnostics;314
1.6.13.1;References;317
1.6.14;Asymmetric vortex shedding in the turbulent wake of a flat plate in a ratating fluid;318
1.6.14.1;1 Introduction;318
1.6.14.2;2 Computational approach and flow characteristics;319
1.6.14.3;3 Results and discussion;320
1.6.14.4;4 Conclusions;320
1.6.14.5;References;321
1.6.15;Stability of steady vortices and new equilibrium flows from “Imperfect-Velocity-Impulse” diagrams;322
1.6.15.1;References;325
1.6.16;The Effect of Freestream Turbulence on Far Axisymmetric Wakes;326
1.6.16.1;References;329
1.6.17;Application of the deterministic turbulence method to study of LEBU-device mechanism;330
1.6.17.1;Introduction.;330
1.6.17.2;Definitions.;330
1.6.17.3;Assumptions.;330
1.6.17.4;Deterministic Turbulence.;330
1.6.17.5;Present Approach.;331
1.6.17.6;LEBU-Devices.;331
1.6.17.7;LEBU Mechanism.;332
1.6.17.8;References;333
1.6.18;The role of the intense vorticity structures in the turbulent structure of the jet edge;334
1.6.18.1;1 Introduction;334
1.6.18.2;2 Direct numerical simulation of a turbulent plane jet;334
1.6.18.3;3 Results and discussion;334
1.6.18.4;References;336
1.6.19;Large Scale Dynamics of a Jet in a Counter Flow;337
1.6.19.1;References;339
1.6.20;Dynamics of vortex filaments in turbulentflows and their impact on particle dispersion;341
1.6.20.1;References;344
1.6.21;The effect of coherent structureson the secondary flow in a square duct;345
1.6.21.1;1 Introduction;345
1.6.21.2;2 Numerical methods;345
1.6.21.3;3 Results;346
1.6.21.4;References;347
1.7;Part V Multiphase and non-Newtonian flows;349
1.7.1;How to Discriminate Between Light and Heavy Particles in Turbulence;350
1.7.1.1;References;353
1.7.2;Anisotropic clustering and particles velocity statistics in shear turbulence;354
1.7.2.1;References;357
1.7.3;Direct Numerical Simulation of inertialparticle accelerations in near-wall turbulence: effect of gravity;358
1.7.3.1;Introduction;358
1.7.3.2;Numerical Methodology;359
1.7.3.3;Results and Discussion;359
1.7.3.4;Conclusions;361
1.7.4;Simulating Fibre Suspensions: Lagrangian versus Statistical Approach;362
1.7.4.1;INTRODUCTION;362
1.7.4.2;RESULTS;363
1.7.4.3;References;365
1.7.5;Inertial particles in a turbulent pipe flow:spatial evolution;366
1.7.5.1;1 Results & discussion;366
1.7.5.2;References;369
1.7.6;Heat transfer mechanisms in bubbly Rayleigh-B´enard convection;370
1.7.6.1;References;372
1.7.7;Scaling of polymer drag reduction withpolymer and flow parameters in turbulent channel flow;373
1.7.7.1;1 Introduction;373
1.7.7.2;2 Results and Discussion;374
1.7.7.3;References;376
1.7.8;DNS study on “diameter effect” of drag reduction in viscoelastic-fluid flow;377
1.7.8.1;1 Introduction;377
1.7.8.2;2 Numerical conditions;377
1.7.8.3;3 Results and discussion;378
1.7.8.4;4 Conclusion;380
1.7.8.5;References;380
1.7.9;Modifications of the turbulent structure in a bubbly boundary layer;381
1.7.9.1;References;384
1.7.10;Budgets of polymer free energy inhomogeneous turbulence;385
1.7.10.1;1 Mathematical formulation and results;385
1.7.10.2;References;388
1.7.11;Shear-induced self-diffusion in a Couette flow of a dilute suspension;389
1.7.11.1;References;392
1.8;Part VI Atmospheric turbulence;393
1.8.1;Turbulent flow over rough walls;394
1.8.1.1;1 Introduction;394
1.8.1.2;2 Zero plane displacement and von K´arm´an’s constant;395
1.8.1.3;3 The near-wall turbulence;397
1.8.1.4;4 Conclusions;400
1.8.1.5;References;401
1.8.2;Top-down and bottom-up eddy motion in wallbounded turbulence;402
1.8.2.1;1 Use of sweeps and ejections;403
1.8.2.2;2 Eddy identification with a vorticity threshold;404
1.8.2.3;References;405
1.8.3;A study of turbulent Poiseuille-Ekman flow at different rotation rates using DNS;406
1.8.3.1;1 Abstract;406
1.8.3.2;2 Introduction;406
1.8.3.3;3 DNS of turbulent Poiseuille-Ekman flow;407
1.8.3.4;References;409
1.8.4;Experimental study of forced stratifiedturbulence;410
1.8.4.1;References;413
1.8.5;DNS of the turbulent cloud-top mixing layer;414
1.8.5.1;1 Introduction;414
1.8.5.2;2 Results;415
1.8.5.3;References;417
1.8.6;Modeling and Simulation of Momentum and Heat Transfer in the Atmospheric Boundary Layer over Rough Surface: Study with Improved;418
1.8.6.1;1 Introduction;418
1.8.6.2;2 Anisotropic three-parameter turbulence model;418
1.8.6.3;3 Turbulent Prandtl number in a Stably Stratified Boundary Layer over Rough Surface;420
1.8.6.4;References;421
1.8.7;Wind Direction Effects on Urban Like Roughness: an LES Study;422
1.8.7.1;1 Introduction;422
1.8.7.2;2 Numerical Approach;422
1.8.7.3;3 Results;423
1.8.7.3.1;3.1 Mean Flow;423
1.8.7.3.2;3.2 Drag and lift forces;424
1.8.7.4;4 Conclusions;425
1.8.7.5;References;425
1.9;Part VII Geophysical and astrophysical turbulence;426
1.9.1;Anisotropy in turbulent rotating convection;427
1.9.1.1;Introduction;427
1.9.1.2;Anisotropy quantified;427
1.9.1.3;Experimental and numerical methods;428
1.9.1.4;Results;429
1.9.1.5;Discussion and conclusion;430
1.9.1.6;References;430
1.9.2;Nonlocal interactions and condensation inforced rotating turbulence;431
1.9.2.1;1 Introduction;431
1.9.2.2;2 Method and results;432
1.9.2.3;3 Conclusion;434
1.9.2.4;References;434
1.9.3;Structural Features of Rotating ShearedTurbulence;435
1.9.3.1;References;438
1.9.4;Structure functions and energy transfers in adecaying rotating turbulence experiment;439
1.9.4.1;References;442
1.9.5;Table-top rotating turbulence: an experimentalinsight through particle tracking;443
1.9.5.1;Introduction;443
1.9.5.2;Exploratory experiments in rotating turbulence;444
1.9.5.3;Ongoing experiments;445
1.9.5.4;References;446
1.9.6;On the structure of rapidly-rotating, decayingturbulence;447
1.9.6.1;Introduction;447
1.9.6.2;How columnar eddies form;448
1.9.6.3;The experimental evidence at Ro ~ 1;448
1.9.6.4;Why linear behaviour at Ro ~1?;449
1.9.6.5;The Decay of Energy;450
1.9.6.6;References;450
1.9.7;Large-eddy simulations of gravity current flows past submerged cylinders;451
1.9.7.1;References;452
1.9.8;Large scale quasi-2D structures and the problem of nonlinear bottom friction;455
1.9.8.1;References;458
1.9.9;Double-period oscillation of passive scalar flux in stratified turbulence;459
1.9.9.1;References;459
1.9.10;Energy spectra of stably stratified turbulence;461
1.9.10.1;References;464
1.9.11;The wind-driven turbulent oscillating channel flow subjected to a stable stratification;465
1.9.11.1;Introduction;465
1.9.11.2;Turbulent oscillating channel flow;465
1.9.11.3;Stably stratified turbulent oscillating channel flow;467
1.9.11.4;Conclusion;468
1.9.11.5;References;468
1.9.12;Numerical studies of turbulence in breaking internal waves;469
1.9.12.1;References;470
1.9.13;Vortex self-similarity and the evolution of unforced inviscid two-dimensional turbulence;473
1.9.13.1;References;476
1.9.14;Large Eddy Simulation of compressible magnetohydrodynamic turbulence in the local interstellar medium;477
1.9.14.1;References;480
1.10;Part VIII Transport and mixing;481
1.10.1;Experimental Studies of Turbulent Rayleigh-Bénard Convection;482
1.10.1.1;References;488
1.10.2;Various flow amplitudes in 2D non-Oberbeck-Boussinesq Rayleigh-Bénard convection in water;490
1.10.2.1;References;493
1.10.3;A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux boundaries;494
1.10.4;Diffusion of heavy particles in turbulent flows;495
1.10.4.1;References;498
1.10.5;Quantification of heavy particle segregation in turbulent flows: a Lagrangian approach;499
1.10.5.1;References;502
1.10.6;The dispersion of lines written in a turbulent jet flow;503
1.10.6.1;References;505
1.10.7;PDF modeling of vapour micromixing in turbulent evaporating sprays;506
1.10.7.1;References;507
1.10.8;Forces on light particles in stratified turbulence;509
1.10.8.1;Introduction;509
1.10.8.2;Forces on light inertial particles;509
1.10.8.3;Particle dispersion: the role of the Basset force;511
1.10.8.4;Conclusions;512
1.10.8.5;References;512
1.10.9;Renormalized transport of inertial particles;513
1.10.9.1;References;516
1.10.10;Turbulence modification in the vicinity of a solid particle;517
1.10.10.1;References;520
1.10.11;Particle Transport in Turbulent Wakes Behind Spherical Caps;521
1.10.11.1;1 Introduction;521
1.10.11.2;2 Methods;521
1.10.11.3;3 Results;522
1.10.11.4;4 Discussion and Conclusion;524
1.10.11.5;References;524
1.10.12;Turbulent heat transfer and large-scale flow in convection cells with aspect ratio G > 1;525
1.10.12.1;1 Introduction;525
1.10.12.2;2 Dependence of heat transfer on aspect ratio;526
1.10.12.3;3 Large-scale circulation (LSC);526
1.10.12.3.1;3.1 Proper Orthogonal Decomposition (POD);527
1.10.12.4;References;528
1.10.13;Shot noise of thermal plumes : Evidence of a boundary layer instability consistent with the onset of Kraichnan’s Regime of convection;529
1.10.13.1;1 Introduction and Motivation;529
1.10.13.2;2 Experimental set-up;529
1.10.13.3;3 Results : a new signatures of the transition to the Ultimate Regime;530
1.10.13.4;4 Interpretation and Conclusion : a boundary layer instability;530
1.10.13.5;References;532
1.10.14;Scalar mixing in turbulent confined flow;533
1.10.14.1;References;536
1.10.15;Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent rotating Rayleigh-Bénard convection;537
1.10.15.1;References;540
1.10.16;Oscillations of Large-Scale Structures in turbulent Mixed Convection in a rectangular enclosure;541
1.10.16.1;1 Introduction;541
1.10.16.2;2 Experimental set up;542
1.10.16.3;3 Results;542
1.10.16.4;References;544
1.10.17;Interaction between slope flows and an urban heat island;545
1.10.17.1;1 Introduction;545
1.10.17.2;2 Experimental setup;545
1.10.17.3;3 Results;546
1.10.17.4;References;548
1.10.18;Origin of the small-scale anisotropy of the passive scalar fluctuations;549
1.10.18.1;References;552
1.10.19;Mixing asymmetry in variable densityturbulence;553
1.10.19.1;References;556
1.10.20;Turbulent transport close to a wall;557
1.10.20.1;References;560
1.10.21;Persistence of inhomogeneity of the turbulence generated by the static grid structures;561
1.10.21.1;1 Introduction;561
1.10.21.2;2 Results and Discussion;562
1.10.21.3;References;564
1.10.22;On the energy decay of grid generated turbulence;565
1.10.22.1;References;568
1.10.23;Turbulent Entrainment in Jets: The role of Kinetic Energy;569
1.10.23.1;1 Introduction;569
1.10.23.2;2 DNS of a turbulent plane jet;569
1.10.23.3;3 Results and Discussion;569
1.10.23.4;References;570
1.10.24;Fast and slow changes of the length of gradient trajectories in homogeneous shear turbulence;573
1.10.24.1;References;577
1.11;Part IX W all bounded flows;578
1.11.1;Coherent streaky structures and optimal perturbations of turbulent boundary layers;579
1.11.1.1;References;582
1.11.2;Time-mean description of turbulent bluff-body separation in the high-Reynolds-number limit;583
1.11.2.1;1 Motivation;583
1.11.2.2;2 Asymptotic picture of the flow near separation;584
1.11.2.3;3 Current research and further outlook;586
1.11.2.4;References;586
1.11.3;Isotropic Free-stream Turbulence Promotes Anisotropy in a Turbulent Boundary Layer;587
1.11.3.1;References;590
1.11.4;Travelling waves in a straight square duct;591
1.11.4.1;1 Introduction;591
1.11.4.2;2 Numerical method;591
1.11.4.3;3 Results;592
1.11.4.4;References;594
1.11.5;Thermal boundary layers in turbulent Rayleigh-B´enard convection;595
1.11.5.1;1 Introduction;595
1.11.5.2;2 Experimental Results;597
1.11.5.3;References;598
1.11.6;DNS of turbulent transport of scalar concentration in various thermally stratified boundary layers;599
1.11.6.1;References;601
1.11.7;Wall turbulence without walls;603
1.11.7.1;1 Introduction;603
1.11.7.2;2 Numerical experiment;604
1.11.7.3;3 Results;604
1.11.7.4;4 Conclusions;605
1.11.7.5;References;606
1.11.8;Turbulent flow and heat transfer in eccentric annulus;607
1.11.8.1;1 Introduction;607
1.11.8.2;2 Research approach and methods;607
1.11.8.3;3 Results and discussions;607
1.11.8.3.1;3.1 Law of the wall;608
1.11.8.3.2;3.2 Reynolds stress tensor;608
1.11.8.3.3;3.3 Secondary motion;608
1.11.8.3.4;3.4 Intensity of the temperature fluctuations;609
1.11.8.4;4 Conclusions and further Work;610
1.11.8.5;References;610
1.11.9;On imperfect hot-wire resolution issues and their effect on mean quantities;611
1.11.9.1;1 Introduction;611
1.11.9.2;2 Motivation and Strategy;612
1.11.9.3;3 Results and Discussion;613
1.11.9.4;4 Final Remarks;614
1.11.9.5;References;614
1.11.10;The diagnostic plot - a new way to appraise turbulent boundary-layer data;615
1.11.10.1;1 Introduction;615
1.11.10.2;2 The diagnostic plot;616
1.11.10.3;3 Final remarks;618
1.11.10.4;References;618
1.11.11;DHMPIV and Tomo-PIV measurements of three-dimensional structures in a turbulent boundary layer;619
1.11.11.1;1 Experimental setup;619
1.11.11.2;2 Results;620
1.11.11.3;3 Conclusion;622
1.11.12;LDA measurements of Reynolds stresses in aswirling turbulent pipe flow;623
1.11.12.1;1 Background;623
1.11.12.2;2 Experimental Facility;624
1.11.12.3;3 Results and Conclusions;624
1.11.12.4;References;625
1.11.13;Time-resolved stereoscopic PIV of the log-layer in fully developed turbulent pipe flow;627
1.11.13.1;1 Introduction;627
1.11.13.2;2 Experimental Setup;627
1.11.13.3;3 Preliminary Discussion of Results;628
1.11.13.4;4 Outlook;630
1.11.13.5;References;630
1.11.14;Massive separation in rotating turbulent flows;631
1.11.14.1;1 Motivation;631
1.11.14.2;2 Results;632
1.11.14.3;References;634
1.11.15;Scaling of torque in turbulent Taylor-Couetteflow with background rotation;635
1.11.15.1;References;638
1.11.16;Velocity gradient statistics in a turbulentchannel flow;639
1.11.16.1;References;642
1.11.17;Channel flow LES with stochastic modeling of the sub-grid acceleration;643
1.11.17.1;References;646
1.11.18;DNS of three-dimensional separation in turbulent diffuser flows;647
1.11.18.1;References;650
1.11.19;Optimal amplification of large scale streaks in the turbulent Couette flow;651
1.11.19.1;1. Introduction;651
1.11.19.2;2. Results and discussion;652
1.11.19.3;References;653
1.11.20;Symmetry of Coherent Vortices in Plane Couette Flow;655
1.11.20.1;References;658
1.11.21;Universal character of perturbation growth in near-wall turbulence;659
1.11.21.1;1 Introduction;659
1.11.21.2;2 Formulation and numerical method;659
1.11.21.3;3 Results;660
1.11.21.3.1;3.1 Temporal evolution of perturbations;662
1.11.21.4;References;662
1.11.22;Experimental assessment of turbulent drag reduction by wall traveling waves;663
1.11.22.1;References;666
1.11.23;Effects of very-large roughness in turbulent channel flow;667
1.11.23.1;1 Introduction;667
1.11.23.2;2 Experimental details;668
1.11.23.3;3 Results and discussion;668
1.11.23.4;4 Conclusions;670
1.11.23.5;References;670
1.11.24;Roughness effects in a rotating turbulent channel;671
1.11.24.1;References;674
1.11.25;Mean Flow and Turbulence over Rough Surfaces;675
1.11.25.1;References;678
1.12;Part X Intermittency and scaling;679
1.12.1;DNS of vibrating grid turbulence;680
1.12.1.1;References;680
1.12.2;Step onset from an initial uniform distribution of turbulent kinetic energy.;681
1.12.2.1;1 Introduction;681
1.12.2.2;2 Results and discussion;681
1.12.2.3;References;683
1.12.3;Fractal-generated turbulent scaling laws from a new scaling group of the multi-point correlation equation;685
1.12.3.1;1 Multi-point equation of homogeneous turbulence;685
1.12.3.2;2 Invariant solutions and turbulent decay scaling laws;686
1.12.3.3;References;688
1.12.4;Casimir Cascades in Two-Dimensional Turbulence;689
1.12.4.1;1 Two-Dimensional Turbulence;689
1.12.4.2;References;692
1.12.5;The development of truncated inviscid turbulence and the FPU-problem;693
1.12.5.1;References;696
1.12.6;The renormalized eddy-fragmentation equation and its exact solutions;697
1.12.6.1;References;700
1.12.7;Determination of the statistics of the velocity gradient tensor as a function of scale : solution of the tetrad model;701
1.12.7.1;References;704
1.12.8;TSF Experiment for comparision of high Reynold’s number turbulence in He I and He II : first results.;705
1.12.8.1;1 Experimental facility and sensors;705
1.12.8.2;2 First results;707
1.12.8.3;3 Conclusion;708
1.12.8.4;References;708
1.12.9;Extraction of the non-equilibrium energy spectrum in high Reynolds number turbulence;709
1.12.9.1;References;712
1.12.10;Universality of Kolmogorov law in spectrally condensed turbulence in thin layers;713
1.12.10.1;References;714
1.12.11;Multi-scale correlations in regular and fractal-generated turbulence;715
1.12.11.1;Introduction;715
1.12.11.2;Results for fractal-generated turbulence;716
1.12.11.3;References;718
1.12.12;On an alternative explanation of anomalous scaling and how inertial is the inertial range;719
1.12.12.1;References;722
1.12.13;Phenomenological relation between the Kolmogorov constant and the skewness in turbulence;723
1.12.13.1;References;724
1.12.14;Kolmogorov scaling and intermittency in Rayleigh-Taylor turbulence;725
1.12.14.1;References;728
1.12.15;Observation of weak turbulence spectra of capillary waves;729
1.12.15.1;References;732
1.12.16;A new numerical methodology to follow the time-decay of turbulence;733
1.12.16.1;References;736
1.12.17;Velocity kinematic relations in decaying turbulent flow past a grid;737
1.12.17.1;References;740
1.12.18;Lagrangian intermittency and time-correlations in two-dimensional turbulence;741
1.12.18.1;References;744
1.13;Part XI Large eddy simulation;745
1.13.1;Implicit Large-Eddy Simulation: Theory and Application;746
1.13.1.1;1 General Concept of ILES;746
1.13.1.2;2 The Modified Differential Equation;747
1.13.1.3;3 Review of ILES approaches;749
1.13.1.3.1;3.1 The Volume Balance Procedure of Schumamm;749
1.13.1.3.2;3.2 The Kawamura-Kuwahara scheme;749
1.13.1.3.3;3.3 The Piecewise-Parabolic Method;749
1.13.1.3.4;3.4 The Flux-Corrected-Transport Method;750
1.13.1.3.5;3.5 The MPDATA Method;750
1.13.1.3.6;3.6 The Optimum Finite-Volume Scheme;750
1.13.1.3.7;3.7 Implicit LES by Adaptive Local Deconvolution;751
1.13.1.4;References;751
1.13.2;A challenging new problem for LES: the flow near the turbulent/nonturbulent interface;754
1.13.2.1;1 Introduction;754
1.13.2.2;2 Direct numerical Simulation of turbulent plane jets;754
1.13.2.3;3 Results and discussion;756
1.13.2.4;References;757
1.13.3;Towards practical large-eddy simulations of complex turbulent flows;758
1.13.3.1;References;761
1.13.4;Coherent Vortex Simulation: application to 3D homogeneous isotropic turbulence;762
1.13.4.1;1 Introduction;762
1.13.4.2;2 Methodology;763
1.13.4.3;3 Numerical Results;763
1.13.4.4;4 Conclusions and Discussions;764
1.13.4.5;References;764
1.13.5;LES of a Non-Premixed Flame with anAssumed Tophat FDF;766
1.13.5.1;References;769
1.13.6;Closure models for inhomogeneous turbulence;770
1.13.6.1;References;773
1.13.7;Statistical Mechanics of Fluid Turbulence based on the Cross-Independence Closure Hypothesis;774
1.13.7.1;1.1 Introduction;774
1.13.7.2;1.2 Cross-independence Closure Hypothesis;774
1.13.7.3;1.3 Inhomogeneous Turbulence;775
1.13.7.4;1.4 Turbulent Wakes;776
1.13.7.5;1.5 References;777
1.13.8;Large-Eddy Simulation of a Two-Phase Plane Mixing-Layer;778
1.13.8.1;1 Introduction;778
1.13.8.2;2 Flow and Boundary Conditions;778
1.13.8.3;3 Results and Discussion;779
1.13.8.3.1;3.1 Gas-phase;779
1.13.8.3.2;3.2 Liquid-phase;779
1.13.8.4;4 Conclusions;779
1.13.8.5;5 Acknowledgement;780
1.13.8.6;References;780
1.13.9;Subgrid particle resolution for the turbulenttransport of a passive scalar;782
1.13.9.1;1 Introduction;782
1.13.9.2;2 The numerical method;782
1.13.9.3;3 Results;783
1.13.9.4;4 Conclusion;785
1.13.9.5;References;785
1.13.10;An adaptive local deconvolution method forgeneral curvilinear coordinate systems;786
1.13.10.1;References;788
1.13.11;On under-resolved simulation of atmosphericconvection;790
1.13.11.1;References;792
1.13.12;The Multispectral Method: Progress and Prospects;793
1.13.12.1;1 Introduction;793
1.13.12.2;2 The models in question;793
1.13.12.3;3 Spectral Reduction;794
1.13.12.4;4 Interpolation;795
1.13.12.5;5 The Multispectral Method;796
1.13.12.6;References;796
1.13.13;Discretization errors and subgrid scale implementations in Large Eddy Simulations;797
1.13.13.1;References;800
1.14;Part XII Magnetohydrodynamical turbulence;801
1.14.1;Reversals of the magnetic field generated by a turbulent flow;802
1.14.1.1;1 A dynamo generated by a von Karman swirling flow;802
1.14.1.2;2 Geometry of the mean magnetic field: equatorial versus axial dipoles;804
1.14.1.3;3 Broken symmetries and dynamics of the large scale magnetic field;805
1.14.1.4;4 A mechanism for oscillations and reversals;806
1.14.1.5;5 A simple model for Earth’s magnetic field reversals;808
1.14.1.6;References;809
1.14.2;Direct measurement of turbulent magnetic diffusivity in liquid metal flow;810
1.14.2.1;References;813
1.14.3;Shell models of MHD turbulence;814
1.14.3.1;References;817
1.14.4;Turbulence induced by magnetic fields;818
1.14.4.1;References;821
1.14.5;Spin-up in MHD turbulence;822
1.14.5.1;Acknowledgments;825
1.14.5.2;References;825
1.14.6;Influence of helicities on statistical properties of MHD turbulence;826
1.14.6.1;References;828
1.14.7;Transient growth in MHD duct flow;830
1.14.7.1;References;833
1.14.8;Optical visualisation of the flow around a cylinder in electrolyte under strong axial magnetic field.;834
1.14.8.1;Introduction;834
1.14.8.2;Experimental device;836
1.14.8.3;Results;836
1.14.8.4;Acknowledgments;837
1.14.8.5;References;837
1.14.9;Synthetic turbulence model and DNS formagnetohydrodynamics with rotation;838
1.14.9.1;1 Introduction;838
1.14.9.2;2 Numerical method;838
1.14.9.3;3 Results;839
1.14.9.4;4 Perspectives;841
1.14.9.5;References;841
1.14.10;Spectral analysis of energy transfers in anisotropic MHD turbulence;842
1.14.10.1;References;845
1.15;Part XIII Acoustics of turbulence flows;846
1.15.1;Boundary layer influence on cavity noisegeneration;847
1.15.1.1;Introduction;847
1.15.1.2;Experimental setup;848
1.15.1.3;Results;848
1.15.1.4;References;850
1.15.2;Instability waves as a source of subsonic jetnoise;851
1.15.2.1;References;853
1.15.3;Experimental study of sound production for constricted channels: application to simplified vocal tract geometries;855
1.15.3.1;1 Introduction;855
1.15.3.2;2 From “in-vivo” observations to “in-vitro” experiments;855
1.15.3.3;3 Results;857
1.15.3.4;Conclusion and perspectives;858
1.15.3.5;References;858
1.15.4;Turbulent Pressure Statistics in an Underwater Boundary-Layer Experiment;859
1.15.4.1;Introduction;859
1.15.4.2;Wavenumber-frequency decomposition;859
1.15.4.3;Flow noise;860
1.15.4.4;Summary;862
1.15.4.5;References;862
1.15.5;Spectral reconstruction of sound radiated byan organ pipe;863
1.15.5.1;References;866
1.15.6;Aerodynamic sound generation by turbulence in shear flows;867
1.15.6.1;References;870
1.16;Part XIV Reacting and compressible turbulence;871
1.16.1;On implicit turbulence modeling for LES of compressible flows;872
1.16.1.1;References;873
1.16.2;Injection of a plane reacting jet into a supersonic turbulent channel flow;875
1.16.2.1;1 Introduction;875
1.16.2.2;2 Numerical details;875
1.16.2.3;3 Results;876
1.16.2.4;References;877
1.16.3;Turbulent premixed flame fronts: fractalscaling and implications for LES modeling;879
1.16.3.1;1 Introduction;879
1.16.3.2;2 Methodology: experiments and numerics;879
1.16.3.3;3 Results and analysis;880
1.16.3.4;References;882
1.16.4;Large eddy simulation of a lean premixed swirl flame in complex geometry - comparison of two turbulent combustion models;883
1.16.4.1;References;885
1.17;Part XV Posters;887
1.17.1;KS inertial range and validity of Richardson’slaw;888
1.17.1.1;1 Kinematic Simulation;888
1.17.1.2;2 Kinematic Simulation and t³ law;888
1.17.1.3;3 Present study;889
1.17.1.4;References;889
1.17.2;Lagrangian Vortex Methods in Turbulent Channel Flows;890
1.17.2.1;References;890
1.17.3;Unstable and turbulent flows simulated by means of the Boltzmann kinetic equation;891
1.17.3.1;References;891
1.17.4;Natural Transition in Plane Poiseuille Flow;892
1.17.4.1;References;893
1.17.5;Stabilization of the turbulent flows in anisotropic viscoelastic tubes;894
1.17.5.1;References;894
1.17.6;Simulation of induced transition in hypersonic regime: Validation of foot print of the vortical structures;895
1.17.6.1;References;896
1.17.7;Active grid generated turbulence;897
1.17.8;Velocity characterisation of axisymmetric jets from human-sized channels;898
1.17.9;The role of nonlocality in unsteady turbulence;899
1.17.9.1;References;899
1.17.10;Coherent enstrophy production and dissipation in 2D turbulence with and without walls;900
1.17.10.1;References;900
1.17.11;Space-scale analysis of enstrophy transfers in two-dimensional turbulence;901
1.17.12;Hydrodynamic stability of a stratified suspension flow in a plane channel;902
1.17.12.1;References;902
1.17.13;Localization of compact invariant sets of theLorenz’ 1984 model;903
1.17.13.1;References;903
1.17.14;Large-scale energy dissipation and equatorialsuperrotation in shallow water turbulence;904
1.17.15;The effects of rain on wind-driven turbulent flow;905
1.17.15.1;References;905
1.17.16;New results on grid-generated turbulence;906
1.17.17;Gas-liquid interaction under vibration field effect;907
1.17.18;An Invariant Nonlinear Eddy Viscosity Model based on a 4D Modelling Approach;908
1.17.18.1;References;908
1.17.19;Projection of the turbulence closure problem on the invariant triangle as the basis for improved predictions of complex flows;909
1.17.19.1;References;909
1.17.20;A computational study of the hydrodynamicforces on a rough wall;910
1.17.20.1;References;910
1.17.21;Turbulent flow structure investigation within target fluidic flowmeter;911
1.17.22;The Wake of a Single 2D Roughness Element Immersed in a Turbulent Boundary Layer;912
1.17.22.1;References;912
1.17.23;High spanwise wall-shear stress events inturbulent duct flow;913
1.17.23.1;References;914
1.17.24;A POD-based reconstruction method for the flow in the near-wall region;915
1.17.25;Near-wall velocity and wall shear stress correlations in a separating boundary layer;916
1.17.26;Lifetimes of flow topology in a turbulent boundary layer;917
1.17.27;RDT or low wavenumber modes’ dynamics?;918
1.17.28;Intermittency in high resolution direct numerical simulation of turbulence in a periodic box: a wavelet viewpoint;919
1.17.28.1;References;919
1.17.29;Detached Eddy Simulation of Turbulence Flows in a Pipe with Fractal Shape Orifices;920
1.17.29.1;References;920
1.17.30;Recovery of subgrid-scale turbulence kinetic energy in LES of channel flow;922
1.17.30.1;References;922
1.17.31;Beyond Reynolds stress analysis of quasilaminar flows;923
1.17.32;Anisotropic Organised Eddy Simulation for statistical and hybrid modelling of turbulent flows around bodies;924
1.17.32.1;References;925
1.17.33;Experimental vortex generation and instabilities at flow around a magnetic obstacle;926
1.17.33.1;References;926
1.17.34;A dynamic multiscale subgrid model for MHD turbulence based on Kolmogorov’s equation;927
1.17.34.1;References;927
1.17.35;Low-Prandtl number MHD cooling in a vertical cylindrical container;928
1.17.35.1;References;928
1.17.36;Anomalous scaling of passively advected magnetic field in the kinematic MHD Kazantsev-Kraichnan model;929
1.17.37;A new compressible turbulence model for free and wall-bounded shear layers;930
1.17.38;Modelling of turbulent flow in a gas burner.;931
1.17.38.1;References;931
1.18;Contributors;932