23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-R40

IMPLEMENTATION AND VALIDATION OF THE SPALART-ALLMARAS TURBULENCE MODEL FOR HIGH SPEED FLOWS

R. Marsilio, D. Grillo
Turin Polytechnic University, Italy

Keywords: turbulence modeling,air breathing propulsion

Since the direct numerical simulation of turbulence is not possible for practical flow problems due to computer limitations, and as large-eddy simulation has not yet become a practical tool in aerodynamics, the only way to simulate high speed and high Reynolds-number flows is to solve the Reynolds-averaged Navier-Stokes equations (RANS)together with a turbulence model. The aim of this paper is to develop an axysimmetric numerical procedure, easily extendible to 3-D configurations, based on the RANS equations coupled with a turbulence model to compute the external flow of a plug nozzle. The governing equations are discretized in the physical domain according with a time-dependent finite-volume technique with second order accuracy achieved by ENO criteria. The one-equation Splalart-Allmaras turbulence model is written in integral form and solved together with the flow equations. The complex shock-slip surfaces, shock-boundary layer interactions appear in the flowfield will be numerically captured by the method. The numerical data carried-out by the methodology will be validate against analogous experimental, analytical and numerical results obtained by other authors.

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