期刊
JOURNAL OF TURBULENCE
卷 14, 期 9, 页码 43-61出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14685248.2013.854901
关键词
compressible turbulence; direct numerical simulation; free shear layers; turbulence modelling; subgrid scale
资金
- National Center for Hypersonic Combined Cycle Propulsion Grant [FA-9550-09-1-0611]
An appraisal is made of several subgrid scale (SGS) viscous/scalar dissipation closures via a priori analysis of direct numerical simulation data in a temporally evolving compressible mixing layer. The effects of the filter width, the compressibility level and the Schmidt number are studied for several models. Based on the scaling of SGS kinetic energy, a new formulation for SGS viscous dissipation is proposed. This yields the best overall prediction of the SGS viscous dissipation within the inertial subrange. An SGS scalar dissipation model based on the proportionality of the turbulent time scale with the scalar mixing time scale also performs the best for the filter widths in the inertial subrange. Two dynamic methods are implemented for the determination of the model coefficients. The one based on the global equilibrium of dissipation and production is shown to be more satisfactory than the conventional dynamic model.
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