Advances in Turbulence XII: Proceedings of the 12th EUROMECH European Turbulence Conference, September 7-10, 2009, Marburg, Germany

ISBN-13: 9783642030840 / Angielski / Twarda / 2009 / 973 str.

Eckhardt, Bruno

Opis

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.

Spis treści

Lagrangian aspects.- Lagrangian modeling and properties of particles with inertia.- Effect of Fax#x00E9;n forces on acceleration statistics of material particles in turbulent flow.- Lagrangian analysis of turbulent convection.- Linear and angular dynamics of an inertial particle in turbulence.- Collision rate between heavy particles in a model turbulent flow.- From cloud condensation nuclei to cloud droplets: a turbulent model.- Lagrangian statistics of inertial particles in turbulent flow.- Lagrangian statistics of two#x2013;dimensional turbulence in a square container.- Measurement of Lagrangian Particle Trajectories by Digital in-line Holography.- 3-D Particle Tracking Velocimetry (PTV) in gas flows using coloured tracer particles.- Two-particle dispersion in 2D inverse cascade turbulence and its telegraph equation model.- Numerical simulations of particle dispersion in stratified flows.- Instability and Transition.- Experimental study of the von K#x00E1;rm#x00E1;n flow from = 10 to 10: spontaneous symmetry breaking and turbulent bifurcations.- Flow reversals in a vertical channel.- Linear Instability of Streamwise Corner Flow.- DNS of turbulent plane Couette flow with emphasis on turbulent stripe.- Geometry of state space in plane Couette flow.- Linear and nonlinear instabilities of sliding Couette flow.- Localization in plane Couette edge dynamics.- Nonlinear optimal perturbations in plane Couette flow.- Order parameter in laminar-turbulent patterns.- Pattern formation in low Reynolds number plane Couette flow.- Quasi-stationary and chaotic convection in low rotating spherical shells.- Linear stability of 2D rough channels.- Transient turbulent bursting in enclosed flows.- On New Localized Vortex Solutions in the Couette-Ekman Layer.- Shear instabilities in Taylor-Couette flow.- Particle Tracking Velocimetry in Transitional Plane Couette Flow.- Experimental study of coherent structures in turbulent pipe flow.- Forced localized turbulence in pipe flows.- From localized to expanding turbulence.- Influence of test-rigs on the laminar-to-turbulent transition of pipe flows.- Interaction of turbulent spots in pipe flow.- Large-scale transitional dynamics in pipe flow.- Nonlinear coherent structures in a square duct.- Quantitative measurement of the life time of turbulence in pipe flow.- Experimental investigation of turbulent patch evolution in spatially steady boundary layers.- Interaction of noise disturbances and streamwise streaks.- Linear generation of multiple time scales by 3D unstable perturbations.- Convection at very high Rayleigh number: signature of transition from a micro-thermometer inside the flow.- Estimating local instabilities for irregular flows in the differentially heated rotating annulus.- Search for the #x201C;ultimate state#x201D; in turbulent Rayleigh-B#x00E9;nard convection.- Rayleigh#x2013;Taylor instability in two dimensions and phase-field method.- Split energy cascade in quasi-2D turbulence.- Stabililty and laminarisation of turbulent rotating channel flow.- The vortical flow pattern exhibited by the channel flow on a rotating system just past transition under the influence of the Coriolis force.- Transient evolution and high stratification scaling in horizontal mixing layers.- Control of turbulent flows.- Toward cost-effective Control of Wall Turbulence for Skin Friction Drag Reduction.- Active control of turbulent boundary layer using an array of piezo-ceramic actuators.- Flat plate turbulent boundary-layer control using vertical LEBUs.- Estimation of the spanwise wall shear stress based on upstream information for wall turbulence control.- Interactions between vortex generators and a flat plate boundary layer. Application to the control of separated flows..- Modulated global mode of a controlled wake.- Swirl effects in turbulent pipe flow.- Control of an axisymmetric turbulent wake by a pulsed jet.- Direct Numerical Simulations of turbulent mixed convection in enclosures with heated obstacles.- On Drag Reduction in Turbulent Channel Flow over Superhydrophobic Surfaces.- Response of Periodically Modulated Turbulence.- Turbulent drag reduction by feedback: a Wiener-filtering approach.- Vortex dynamics and structure formation.- A driving mechanism of turbulent puff in pipe flow.- Wavelet tools to study vortex bursting and turbulence production.- The minimum-enstrophy principle for decaying 2D turbulence in circular domains.- Direct numerical simulation of a turbulent vortex ring.- Reconnection of vortex bundles.- Turbulent energy cascade caused by vortex stretching.- Instabilities and transient growth of trailing vortices in stratified fluid.- Implementation of Vortex Stretching into the Two-Dimensional Navier-Stokes Equations via Arbitrary External Straining.- Turbulent cascade of a quantum fluid at finite temperature.- Visualization of quantum turbulence in He-B by thermal excitations.- The 3D structure of a dipole in a shallow two-layer fluid.- The 3D character of decaying turbulence in a shallow fluid layer.- Vortex dynamics in a Karman street behind a heated cylinder: defects and potentialities of acoustic diagnostics.- Asymmetric vortex shedding in the turbulent wake of a flat plate in a rotating fluid.- Stability of steady vortices and new equilibrium flows from #x201C;Imperfect-Velocity-Impulse#x201D; diagrams.- The effect of Freestream Turbulence on Far Axisymmetric Wakes.- Application of the deterministic turbulence method to study of LEBU-device mechanism.- The role of the intense vorticity structures in the turbulent structure of the jet edge.- Large Scale Dynamics of a Jet in a Counter Flow.- Dynamics of vortex filaments in turbulent flows and their impact on particle dispersion.- The effect of coherent structures on the secondary flow in a square duct.- Multiphase and non-Newtonian flows.- How to Discriminate Between Light and Heavy Particles in Turbulence.- Anisotropic clustering and particles velocity statistics in shear turbulence.- Direct Numerical Simulation of inertial particle accelerations in near-wall turbulence: effect of gravity.- Simulating Fibre Suspensions: Lagrangian versus Statistical Approach.- Inertial particles in a turbulent pipe flow: spatial evolution.- Heat transfer mechanisms in bubbly Rayleigh-B#x00E9;nard convection.- Scaling of polymer drag reduction with polymer and flow parameters in turbulent channel flow.- DNS study on #x201C;diameter effect#x201D; of drag reduction in viscoelastic-fluid flow.- Modifications of the turbulent structure in a bubbly boundary layer.- Budgets of polymer free energy in homogeneous turbulence.- Shear-induced self-diffusion in a Couette flow of a dilute suspension.- Atmospheric turbulence.- Turbulent flow over rough walls.- Top-down and bottom-up eddy motion in wall bounded turbulence.- A study of turbulent Poiseuille-Ekman flow at different rotation rates using DNS.- Experimental study of forced stratified turbulence.- DNS of the turbulent cloud-top mixing layer.- Modelling and Simulation of Momentum and Heat Transfer in the Atmospheric Boundary Layer over Rough Surface: Study with Improved Turbulence Model.- Wind Direction Effects on Urban Like Roughness: an LES Study.- Geophysical and astrophysical turbulence.- Anisotropy in turbulent rotating convection.- Nonlocal interactions and condensation in forced rotating turbulence.- Structural Features of Rotating Sheared Turbulence.- Structure functions and energy transfers in a decaying rotating turbulence experiment.- Table-top rotating turbulence: an experimental insight through particle tracking.- On the structure of rapidly-rotating, decaying turbulence.- Large-eddy simulations of gravity current flows past submerged cylinders.- Large scale quasi-2D structures and the problem of nonlinear bottom friction.- Double-period oscillation of passive scalar flux in stratified turbulence.- Energy spectra of stably stratified turbulence.- The wind-driven turbulent oscillating channel flow subjected to a stable stratification.- Numerical studies of turbulence in breaking internal waves.- Vortex self-similarity and the evolution of unforced inviscid two-dimensional turbulence.- Large Eddy Simulation of compressible magnetohydrodynamic turbulence in the local interstellar medium.- Transport and mixing.- Experimental Studies of Turbulent Rayleigh-B#x00E9;nard Convection.- Various flow amplitudes in 2D non-Oberbeck-Boussinesq Rayleigh-B#x00E9;nard convection in water.- A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux boundaries.- Diffusion of heavy particles in turbulent flows.- Quantification of heavy particle segregation in turbulent flows: a Lagrangian approach.- The dispersion of lines written in a turbulent jet flow.- PDF modeling of vapour micromixing in turbulent evaporating sprays.- Forces on light particles in stratified turbulence.- Renormalized transport of inertial particles.- Turbulence modification in the vicinity of a solid particle.- Particle Transport in Turbulent Wakes Behind Spherical Caps.- Turbulent heat transfer and large-scale flow in convection cells with aspect ratio #x0393; #x003E; 1.- Shot noise of thermal plumes : Evidence of a boundary layer instability consistent with the onset of Kraichnan#x2019;s Regime of convection.- Scalar mixing in turbulent confined flow.- Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent Rotating Rayleigh-B#x00E9;nard convection.- Oscillations of Large-Scale Structures in turbulent Mixed Convection in a rectangular enclosure.- Interaction between slope flows and an urban heat island.- Origin of the small-scale anisotropy of the passive scalar fluctuations.- Mixing asymmetry in variable density turbulence.- Turbulent transport close to a wall.- Persistence of inhomogeneity of the turbulence generated by the static grid structure.- On the energy decay of grid generated turbulence.- Turbulent Entrainment in Jets: The role of Kinetic Energy.- Fast and slow changes of the length of gradient trajectories in homogeneous shear turbulence.- Wall bounded flows.- Coherent streaky structures and optimal perturbations of turbulent boundary layers.- Time-mean description of turbulent bluff-body separation in the high-Reynolds-number limit.- Isotropic Free-stream Turbulence Promotes Anisotropy in a Turbulent Boundary Layer.- Travelling waves in a straight square duct.- Thermal boundary layers in turbulent Rayleigh-B#x00E9;nard convection.- DNS of turbulent transport of scalar concentration in various thermally stratified boundary layers.- Wall turbulence without walls.- Turbulent flow and heat transfer in eccentric annulus.- On imperfect hot-wire resolution issues and their effect on mean quantities.- The diagnostic plot - a new way to appraise turbulent boundary-layer data.- DHMPIV and Tomo-PIV measurements of three-dimensional structures in a turbulent boundary layer.- LDA measurements of Reynolds stresses in a swirling turbulent pipe flow.- Time-resolved stereoscopic PIV of the log-layer in fully developed turbulent pipe flow.- Massive separation in rotating turbulent flows.- Scaling of torque in turbulent Taylor-Couette flow with background rotation.- Velocity gradient statistics in a turbulent channel flow.- Channel flow LES with stochastic modeling of the sub-grid acceleration.- DNS of three-dimensional separation in turbulent diffuser flows.- Optimal amplification of large scale streaks in the turbulent Couette flow.- Symmetry of Coherent Vortices in Plane Couette Flow.- Universal character of perturbation growth in near-wall turbulence.- Experimental assessment of turbulent drag reduction by wall traveling waves.- Effects of very-large roughness in turbulent channel flow.- Roughness effects in a rotating turbulent channel.- Mean Flow and Turbulence over Rough Surfaces.- Intermittency and scaling.- DNS of vibrating grid turbulence.- Step onset from an initial uniform distribution of turbulent kinetic energy..- Fractal-generated turbulent scaling laws from a new scaling group of the multi-point correlation equation.- Casimir Cascades in Two-Dimensional Turbulence.- The development of truncated inviscid turbulence and the FPU-problem.- The renormalized eddy-fragmentation equation and its exact solutions.- Determination of the statistics of the velocity gradient tensor as a function of scale : solution of the tetrad model.- TSF Experiment for comparision of high Reynold#x2019;s number turbulence in He I and He II : first results..- Extraction of the non-equilibrium energy spectrum in high Reynolds number turbulence.- Universality of Kolmogorov law in spectrally condensed turbulence in thin layers.- Multi-scale correlations in regular and fractal-generated turbulence.- On an alternative explanation of anomalous scaling and how inertial is the inertial range.- Phenomenological relation between the Kolmogorov constant and the skewness in turbulence.- Kolmogorov scaling and intermittency in Rayleigh-Taylor turbulence.- Observation of weak turbulence spectra of capillary waves.- A new numerical methodology to follow the time-decay of turbulence.- Velocity kinematic relations in decaying turbulent flow past a grid.- Lagrangian intermittency and time-correlations in two-dimensional turbulence.- Large eddy simulation.- Implicit Large-Eddy Simulation: Theory and Application.- A challenging new problem for LES: the flow near the turbulent/nonturbulent interface.- Towards practical large-eddy simulations of complex turbulent flows.- Coherent Vortex Simulation: application to 3D homogeneous isotropic turbulence.- LES of a Non-Premixed Flame with an Assumed Tophat FDF.- Closure models for inhomogeneous turbulence.- Statistical Mechanics of Fluid Turbulence based on the Cross-Independence Closure Hypothesis.- Large-Eddy Simulation of a Two-Phase Plane Mixing-Layer.- Subgrid particle resolution for the turbulent transport of a passive scalar.- An adaptive local deconvolution method for general curvilinear coordinate systems.- On under-resolved simulation of atmospheric convection.- The Multispectral Method: Progress and Prospects.- Discretization errors and subgrid scale implementations in Large Eddy Simulations.- Magnetohydrodynamical turbulence.- Reversals of the magnetic field generated by a turbulent flow.- Direct measurement of turbulent magnetic diffusivity in liquid metal flow.- Shell models of MHD turbulence.- Turbulence induced by magnetic fields.- Spin-up in MHD turbulence.- Influence of helicities on statistical properties of MHD turbulence.- Transient growth in MHD duct flow.- Optical visualisation of the flow around a cylinder in electrolyte under strong axial magnetic field..- Synthetic turbulence model and DNS for magnetohydrodynamics with rotation.- Spectral analysis of energy transfers in anisotropic MHD turbulence.- Acoustics of turbulence flows.- Boundary layer influence on cavity noise generation.- Instability waves as a source of subsonic jet noise.- Experimental study of sound production for constricted channels: application to simplified vocal tract geometries.- Turbulant Pressure Statistics in an Underwater Boundary-Layer Experiment.- Spectral reconstruction of sound radiated by an organ pipe.- Aerodynamic sound generation by turbulence in shear flows.- Reacting and compressible turbulence.- On implicit turbulence modeling for LES of compressible flows.- Injection of a plane reacting jet into a supersonic turbulent channel flow.- Turbulent premixed flame fronts: fractal scaling and implications for LES modeling.- Large eddy simulation of a lean premixed swirl flame in complex geometry - comparison of two turbulent combustion models.- Posters.- KS inertial range and validity of Richardson#x2019;s law.- Lagrangian Vortex Methods in Turbulent Channel Flows.- Unstable and turbulent flows simulated by means of the Boltzmann kinetic equation.- Natural Transition in Plane Poiseuille Flow.- Stabilization of the turbulent flows in anisotropic viscoelastic tubes.- Simulation of induced transition in hypersonic regime: Validation of foot print of the vortical structures.- Active grid generated turbulence.- Velocity characterisation of axisymmetric jets from human-sized channels.- The role of nonlocality in unsteady turbulence.- Coherent enstrophy production and dissipation in 2D turbulence with and without walls.- Space scale analysis of enstrophy transfers in two-dimensional turbulence.- Hydrodynamic stability of a stratified suspension flow in a plane channel.- Localization of compact invariant sets of the Lorenz#x2019; 1984 model.- Large-scale energy dissipation and equatorial superrotation in shallow water turbulence.- The effects of rain on wind-driven turbulent flow.- New results on grid-generated turbulence.- Gas-liquid interaction under vibration field effect.- An Invariant Nonlinear Eddy Viscosity Model based on a 4D Modelling Approach.- Projection of the turbulence closure problem on the invariant triangle as the basis for improved predictions of complex flows.- A computational study of the hydrodynamic forces on a rough wall.- Turbulent flow structure investigation within target fluidic flowmeter.- The Wake of a Single 2D Roughness Element Immersed in a Turbulent Boundary Layer.- High spanwise wall-shear stress events in turbulent duct flow.- A POD-based reconstruction method for the flow in the near-wall region.- Near-wall velocity and wall shear stress correlations in a separating boundary layer.- Lifetimes of flow topology in a turbulent boundary layer.- RDT or low wavenumber modes#x2019; dynamics?.- Intermittency in high resolution direct numerical simulation of turbulence in a periodic box: a wavelet viewpoint.- Detached Eddy Simulation of Turbulence Flows in a Pipe with Fractal Shape Orifices.- Recovery of subgrid-scale turbulence kinetic energy in LES of channel flow.- Beyond Reynolds stress analysis of quasilaminar flows.- Anisotropic Organised Eddy Simulation for statistical and hybrid modelling of turbulent flows around bodies.- Experimental vortex generation and instabilities at flow around a magnetic obstacle.- A dynamic multiscale subgrid model for MHD turbulence based on Kolmogorov#x2019;s equation.- Low-Prandtl number MHD cooling in a vertical cylindrical container.- Anomalous scaling of passively advected magnetic field in the kinematic MHD Kazantsev-Kraichnan model.- A new compressible turbulence model for free and wall-bounded shear layers.- Modelling of turbulent flow in a gas burner.