Publication: CVS and SCALES simulation of 3-D isotropic turbulence

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Title CVS and SCALES simulation of 3-D isotropic turbulence
Authors/Editors* D. Goldstein, O.V. Vasilyev, N. K.-R. Kevlahan
Where published* J. Turbulence
How published* Journal
Year* 2005
Volume 6
Number 37
Pages 20
In this work CVS and SCALES simulations of decaying incompressible isotropic turbulence are compared to DNS and LES results. Current large eddy simulation (LES) relies on, at best, a zonally adapted filter width to reduce the computational cost of simulating complex turbulent flows. While an improvement over a uniform filter width, this approach has two limitations. First, it does not capture the high wave number components of the coherent vortices that make up the organized part of turbulent flows, thus losing essential physical information. Secondly, the flow is over-resolved in the regions between the coherent vortices, thus wasting computational resources. The stochastic coherent adaptive large eddy simulation (SCALES) approach addresses these shortcomings of LES by using a dynamic grid adaptation strategy that is able to resolve and track the most energetic coherent structures in a turbulent flow field. This corresponds to a dynamically adaptive local filter width. Unlike coherent vortex simulation (CVS), which we show is able to recover low order statistics with no subgrid scale stress model, the higher compression used in SCALES necessitates that the effect of the unresolved subgrid scale (SGS) stresses must be modeled. These SGS stresses are approximated using a new dynamic eddy viscosity model based on Germano
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