A comparative study of turbulence models for overset gridsThe implementation of two different types of turbulence models for a flow solver using the Chimera overset grid method is examined. Various turbulence model characteristics, such as length scale determination and transition modeling, are found to have a significant impact on the computed pressure distribution for a multielement airfoil case. No inherent problem is found with using either algebraic or one-equation turbulence models with an overset grid scheme, but simulation of turbulence for multiple-body or complex geometry flows is very difficult regardless of the gridding method. For complex geometry flowfields, modification of the Baldwin-Lomax turbulence model is necessary to select the appropriate length scale in wall-bounded regions. The overset grid approach presents no obstacle to use of a one- or two-equation turbulence model. Both Baldwin-Lomax and Baldwin-Barth models have problems providing accurate eddy viscosity levels for complex multiple-body flowfields such as those involving the Space Shuttle.
Document ID
19920043660
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Renze, Kevin J. (Iowa State University of Science and Technology, Ames, United States)
Buning, Pieter G. (NASA Ames Research Center Moffett Field, CA, United States)
Rajagopalan, R. G. (Iowa State University of Science and Technology, Ames, United States)