نتایج جستجو برای: eddy viscosity model

تعداد نتایج: 2143237  

Journal: :Journal of Fluid Mechanics 2021

We present an investigation of the fundamental physical processes involved in deep-water gravity wave breaking. Our motivation is to identify underlying reason causing deficiency eddy viscosity breaking model (EVBM) predicting surface elevation for strongly nonlinear waves. Owing limitation experimental methods provision high-resolution flow information, we propose a numerical methodology by de...

2010
Jun Li Zhengwei Wang Mehrdad Massoudi

Large eddy simulations LES based on the Smagorinsky model can be conveniently used in the lattice Boltzmann method LBM because the strain rate tensor, Sij , used to determine the eddy kinematic viscosity can be calculated from the second-order moment of the nonequilibrium distribution function, and the current total nondimensional relaxation time can be determined explicitly. A new method is de...

2015
Christoph Federrath

Turbulence in compressible plasma plays a key role inmany areas of astrophysics and engineering. The extreme plasma parameters in these environments, e.g. highReynolds numbers, supersonic and super-Alfvenic flows, however,make direct numerical simulations computationally intractable even for the simplest treatment—magnetohydrodynamics (MHD). To overcome this problemone can use subgrid-scale (SG...

1999
Qin Chen James T. Kirby Robert A. Dalrymple Andrew B. Kennedy Arun Chawla

In this paper, we focus on the implementation and verification of an extended Boussinesq model for surf zone hydrodynamics in two horizontal dimensions. The time-domain numerical model is based on the fully nonlinear Boussinesq equations. As described in Part I of this two-part paper, the energy dissipation due to wave breaking is modeled by introducing an eddy viscosity term into the momentum ...

Journal: :Mechanics Research Communications 2021

The variational multiscale (VMS) formulation is used to develop residual-based VMS large eddy simulation (LES) models for Rayleigh-Bénard convection. resulting model a mixed that incorporates the and an viscosity model. Wall-Adapting Local Eddy-viscosity (WALE) as in this work. new LES were implemented finite element code Drekar. Simulations are performed using continuous, piecewise linear elem...

2000
STEFANO CERUTTI CHARLES MENEVEAU OMAR M. KNIO

For the purpose of studying the spectral properties of energy transfer between large and small scales in high-Reynolds-number turbulence, we measure the longitudinal subgrid-scale (SGS) dissipation spectrum, defined as the co-spectrum of the SGS stress and filtered strain-rate tensors. An array of four closely spaced X-wire probes enables us to approximate a two-dimensional box filter by averag...

2007
JAN KLEISSL CHARLES MENEVEAU MARC B. PARLANGE

Eddy-viscosity closures for large eddy simulations (LES) of atmospheric boundary layer dynamics include a parameter (Smagorinsky constant cs), which depends upon physical parameters, such as distance to the ground, atmospheric stability, and strain. A field study [Horizontal Arrays Turbulence Study (HATS)] specifically designed to measure turbulence quantities of interest in LES, such as the pa...

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