Dynamic Structure Models for Scalar Flux and Dissipation in Large Eddy Simulation
نویسندگان
چکیده
منابع مشابه
Large - eddy simulation with dynamic SGS models 1 Large - eddy simulation with dynamic subgrid - scale modelsM
Diierent dynamic subgrid scale models, viz. the dynamic model of Germano et al. are evaluated by means of a priori tests. Direct numerical simulation data for fully-developed turbulent and transitional incompressible ows are used. Low correlation is obtained between exact and modeled subgrid scale stresses with the DSM. Conversely, good agreement is found for both the DMM and the DTM, since tho...
متن کاملLarge Eddy Simulation in the Scalar Field
Focusing on Large Eddy Simulation (LES) in the scalar field, this work has threefoldachievement:The development, validation and application of a new anisotropy subgrid scale (SGS)model that is designed to better describe the behavior of SGS scalar flux transportIn the frame of LES, a new developed anisotropy model is proposed and implemented.Unlike the isotropic SGS scalar f...
متن کاملA Family of Dynamic Models for Large-eddy Simulation
Since its rst application, the dynamic procedure has been recognized as an eeec-tive means to compute rather than prescribe the unknown coeecients that appear in a subgrid-scale model for Large-Eddy Simulation (LES). The dynamic procedure (Germano et al. 1991; Ghosal et al. 1995) is usually used to determine the non-dimensional coeecient in the Smagorinsky (1963) model. In reality the procedure...
متن کاملLag-modeling approach for dissipation terms in large eddy simulation
Here hi = uiφ − ūiφ̄ is the SGS scalar flux. Both τij and hi are not available from the resolved (LES) flow field and thus have to be modeled. A very promising approach to modeling τij and hi consists of utilization of extra LES quantities such as SGS kinetic energy (Schumann 1975; Ghosal et al. 1995) and SGS scalar variance (Jiménez et al. 2001; Chumakov & Rutland 2004, 2005). For these quantit...
متن کاملNumerical dissipation vs. subgrid-scale modelling for large eddy simulation
This study presents an alternative way to perform large eddy simulation based on a targeted numerical dissipation introduced by the discretization of the viscous term. It is shown that this regularisation technique is equivalent to the use of spectral vanishing viscosity. The flexibility of the method ensures high-order accuracy while controlling the level and spectral features of this purely n...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: AIAA Journal
سال: 2004
ISSN: 0001-1452,1533-385X
DOI: 10.2514/1.10416