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- W2809080506 abstract "An energy budget analysis and a posteriori tests of subgrid-scale (SGS) models for large eddy simulation (LES) of stationary highly compressible homogeneous isotropic turbulence are carried out at the turbulent Mach number Mt ranging from 0.4 to 1.0 and the Taylor Reynolds number Reλ ranging from 180 to 250. An energy budget analysis shows that the SGS stress τij and the SGS heat flux Qj are dominant terms in the current Mt and Reλ ranges, while other terms are significantly smaller than the divergence of the SGS heat flux Qj and can be neglected in LES. We perform LES of compressible isotropic turbulence by using several SGS models including a dynamic Smagorinsky model, a dynamic mixed model, and an optimal model. In addition, a modified optimal model is constructed based on the magnitude of the filtered strain-rate tensor |S̃|, inspired by the physical insight that the region of the large magnitude of the filtered strain-rate tensor plays a significant role in kinetic energy transfer. Spectra, statistics, and scaling of velocity and thermodynamic variables from LES are tested. The modified optimal model performs better than other models, especially for the spectrum of the compressible velocity component at relatively low turbulent Mach numbers and high Taylor Reynolds numbers. The probability density function and the structure functions of velocity and thermodynamic variables are further studied, demonstrating that the statistical properties of the simulated flows are improved by the modified optimal model." @default.
- W2809080506 created "2018-06-29" @default.
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- W2809080506 date "2018-06-01" @default.
- W2809080506 modified "2023-10-17" @default.
- W2809080506 title "A modified optimal LES model for highly compressible isotropic turbulence" @default.
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- W2809080506 doi "https://doi.org/10.1063/1.5027754" @default.
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