Accession Number : ADA332268

Title :   A Combined Large-Eddy Simulation and Time-Dependent RANS Capability for High-Speed Compressible Flows.

Descriptive Note : Technical rept. 1 May-9 Sep 97,

Corporate Author : BOSTON UNIV MA DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s) : Speziale, Charles G.

PDF Url : ADA332268

Report Date : 09 SEP 1997

Pagination or Media Count : 35

Abstract : An entirely new approach to the large-eddy simulation (LES) of high-speed compressible turbulent flows is presented. Subgrid scale stress models are proposed that are dimensionless functions of the computational mesh size times a Reynolds stress model. This allows a DNS to go continuously to an LES and then a Reynolds-averaged Navier-Stokes (RANS) computation as the mesh becomes successively more coarse or the Reynolds number becomes much larger. Here, the level of discretization is parameterized by the non-dimensional ratio of the computational mesh size to the Kolmogorov length scale. The Reynolds stress model is based on a state-of-the-art two-equation model whose enhanced performance is documented in detail in a variety of benchmark flows. It contains many of the most recent advances in compressible turbulence modeling. Applications to the high-speed aerodynamic flows of technological importance are briefly discussed.

Descriptors :   *TURBULENT FLOW, *COMPRESSIBLE FLOW, SIMULATION, EDDIES(FLUID MECHANICS), COMPUTATIONAL FLUID DYNAMICS, SHEAR STRESSES, NAVIER STOKES EQUATIONS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE