Accession Number : ADA317103

Title :   A New Approach to Validate Subgrid Models in Complex High Reynolds Number Flows.

Descriptive Note : Annual rept. Jun 94-May 95,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING

Personal Author(s) : Menon, Suresh

PDF Url : ADA317103

Report Date : JUN 1996

Pagination or Media Count : 193

Abstract : A dynamic sub grid model was developed by using a method that employed the scale similarity concept for validating the behavior of the subgrid models. Since the scale similarity approach can be used directly in the physical space, there was no need to employ spectral space information for implementing the subgrid model (although spectral space analysis was carried out to compare with past models). Thus, the new dynamic approach has potential for application to more complex flows. The key feature of the dynamic model is that it is a truly local model and does not require any type of averaging for a range of flow problems. The flow fields where no averaging was required are: (1) Taylor-Green flow, (2) decaying isotropic turbulence, (3) forced isotropic turbulence, (4) temporal mixing layers and, (5) free circular jet with axial entrainment.

Descriptors :   *DYNAMICS, *GRIDS, *REYNOLDS NUMBER, TURBULENCE, FLOW FIELDS, ISOTROPISM, MEAN, SPACE(ROOM), ENTRAINMENT, CIRCULAR.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE