Interface and turbulence

Theoretical and computational modeling of turbulence / interface interactions

The interaction between turbulence and surface tension is studied through direct numerical simulation of a canonical multiphase flow. An initially flat interface is inserted into a triply periodic box of decaying homogeneous isotropic turbulence, simulated for a variety of turbulent Reynolds and Weber numbers on mesh sizes of 512 and 1024. Unity density and viscosity ratios are used in order to...

Active Turbulence and Scalar Transport near the Forest–Atmosphere Interface

Turbulent velocity, temperature, water vapor concentration, and other scalars were measured at the canopy– atmosphere interface of a 13–14-m-tall uniform pine forest and a 33-m-tall nonuniform hardwood forest. These measurements were used to investigate whether the mixing layer (ML) analogy of Raupach et al. predicts eddy sizes and flow characteristics responsible for much of the turbulent stre...

burger s equation and turbulence

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Universality classes for self-similarity of noiseless multi-dimensional Burgers turbulence and interface growth

The present work is devoted to the evolution of random solutions of the unforced Burgers and KPZ equations in d–dimensions in the limit of vanishing viscosity. We consider a cellular model and as initial condition assign a value for the velocity potential chosen independently within each cell. We show that the asymptotic behavior of the turbulence at large times is determined by the tail of the...

Near Surface Turbulence and Gas Exchange Across the Air-Sea Interface