Highly Accurate Prediction of Unsteady Viscous Flows
Final rept. 1 Jan 1991-1 Jan 1992
GRUMMAN AEROSPACE CORP BETHPAGE NY
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This report describes a detailed investigation of the effects of computational accuracy on the prediction of shock waveboundary layer interaction. In particular, the result of inaccuracies in the computation of the shock and the flow in its vicinity is studied. A new computational procedure computes all shocks as discontinuities while including all viscous effects. This scheme is used as a standard against which the accuracy of widely used shock capturing schemes is measured. The effect of the numerical error generated by spreading a shock over a few mesh intervals instead of a few mean free paths is evaluated with regard to shockboundary layer interaction. We consider the spreading error, as well as the error produced by reducing the formal accuracy of these schemes near shocks in order to eliminate wiggles. In this report, we present the computational scheme and results for a number of flow configurations.
- Fluid Mechanics