Compressibility Corrections to Closure Approximations for Turbulent Flow Simulations

Cloutman, L D

Lawrence Livermore National Laboratory

关键词: Turbulent Flow;    Heat Flux;    Compressibility;    Modifications;    Pressure Gradients;   

DOI  :  10.2172/15004305
RP-ID  :  UCRL-ID-147757
RP-ID  :  W-7405-ENG-48
RP-ID  :  15004305

美国|英语

来源: UNT Digital Library

【 摘 要 】

We summarize some modifications to the usual closure approximations for statistical models of turbulence that are necessary for use with compressible fluids at all Mach numbers. We concentrate here on the gradient-flu approximation for the turbulent heat flux, on the buoyancy production of turbulence kinetic energy, and on a modification of the Smagorinsky model to include buoyancy. In all cases, there are pressure gradient terms that do not appear in the incompressible models and are usually omitted in compressible-flow models. Omission of these terms allows unphysical rates of entropy change.