Large Eddy Simulation of Three-Dimensional High Speed Aerodynamic Flows
Final technical rept. 1 Aug 96-30 Nov 98
RUTGERS - THE STATE UNIV PISCATAWAY NJDEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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An unstructured grid Large Eddy Simulation LES methodology has been developed for compressible high speed flows. The filtered compressible Navier-Stokes equations are solved on an unstructured grid of tetrahera. The inviscid fluxes are obtained from an exact locally one-dimensional Riemann solver using Godunovs method. The viscous fluxes are obtained using a discrete analog of Gauss Theorem. The reconstruction is performed using a Least Squares technique. The temporal integration is a Runge-Kutta method. The algorithm is overall second order accurate in space and time. Four flowfields have been computed decay of isotropic turbulence, channel flow, supersonic flat plate boundary layer and supersonic compression corner. The first and second cases are effectively incompressible, while the third and fourth cases are supersonic Mach 3. The computed results show close agreement with experiment and Direct Numerical Simulation and validate the unstructured grid LES methodology.
- Fluid Mechanics