The dispersion of particles in a flow is of central importance in various geophysical and environmental problems. The spreading of aerosols and soot in the air, the growth and dispersion of plankton blooms in seas and oceans, or the transport of sediment in rivers, estuaries and coastal regions are striking examples. These problems are characterized by strong nonlinear coupling between several dynamical mechanisms. As a result, processes on widely different length and time scales are simultaneously of importance. The multiscale nature of this challenging field motivated the EUROMECH colloquium on particle-laden flow that was held at the University of Twente in 2006. This book contains a selection of the papers that were presented.
Author(s): B.J. Geurts, H. Clercx, W. Uijttewaal
Edition: 1
Year: 2007
Language: English
Pages: 436
Contents......Page 6
Preface......Page 10
Part I: Dispersion in environmental flows......Page 12
Sand motion induced by oscillatory flows: sheet flow and vortex ripples......Page 13
Sediment transport, ripple dynamics and object burial under shoaling waves......Page 25
On the influence of suspended sediment transport on the generation of offshore sand waves......Page 38
Sediment transport by coherent structures in a turbulent open channel flow experiment......Page 51
Transport and mixing in the stratosphere: the role of Lagrangian studies......Page 64
Numerical modeling of heat and water vapor transport through the interfacial boundary layer into a turbulent atmosphere......Page 77
Stromatactic patterns formation in geological sediments: field observations versus experiments......Page 90
Part II: Lagrangian statistics, simulation and experiments of turbulent dispersion......Page 100
Anomalous diffusion in rotating stratified turbulence......Page 101
Geometry and statistics in homogeneous isotropic turbulence......Page 106
Refined vorticity statistics of decaying rotating three-dimensional turbulence......Page 117
Lagrangian passive scalar intermittency in marine waters: theory and data analysis......Page 130
Compositional and particulate gravity currents: a computational investigation......Page 140
The effect of stable stratification on fluid particle dispersion......Page 152
DNS of particle-laden flow over a backward facing step at a moderate Reynolds number......Page 165
Stochastic modeling of fluid velocity seen by heavy particles for two-phase LES of non-homogeneous and anisotropic turbulent flows......Page 178
DNS study of local-equilibrium models in dilute particle-laden turbulent pipe flows......Page 192
Numerical particle tracking studies in a turbulent round jet......Page 206
Acceleration and velocity statistics of Lagrangian particles in turbulence......Page 219
Numerical studies of viscous effects for particle fluxes to perfectly absorbing spherical surfaces in turbulent environments: biological applications......Page 227
3D acoustic Lagrangian velocimetry......Page 240
Lagrangian multi-particle statistics......Page 254
Simultaneous measurements of the fluid and the solid phasesin homogeneous turbulence: preliminary results at Re[sub(λ)] = 250......Page 267
Laboratory model of two-dimensional polar beta-plane turbulence......Page 280
Lagrangian particle tracking in high Reynolds number turbulence......Page 293
Part III: Heavy particles, aggregation and patterns in turbulence......Page 306
Lagrangian dispersion in coastal applications......Page 307
Influence of Coriolis forces on turbidity currents and sedimentdeposition......Page 322
A stochastic model for large eddy simulation of a particle-laden turbulent flow......Page 335
Aggregate formation in 3D turbulent-like flows......Page 349
Influence of the turbulence structure on the particle sedimentation in wall-bounded flows......Page 362
Mean and variance of the velocity of solid particles in turbulence......Page 374
The turbulent rotational phase separator......Page 381
Particle laden geophysical flows: from geophysical to sub-kolmogorov scales......Page 394
