Discrete vortex simulation of high reynolds number flows

This report describes new procedures for accurate and economical simulation of two-dimensional separated and free shear flows using the discrete vortex method. The new procedures offer improvement in several important aspects of discrete vortex simulation of complex flow fields, and consist of special vortex release, merger and removal13; strategies, interpretation of vortex patterns, solution of equations of motion and computation of- time-averaged quantities. The effectiveness of these procedures, based on the fundamental mechanisms governing such flows, is illustrated by application to three problems : (i) flow past a finite normal flat plate, (ii) flow past a 26% thick symmetric Joukowski aerofoil at an angle of attack of 15xB0; and (iii) turbulent wake of a long thin struamwise flat plate.13; The computed results show good agreement with experiments for the evolution of the flow field, growth of the separation region, the Strouhal number, the moon flow characteristics and the Reynolds shear stress. It is expected Chat the new procedures will be useful in simulating any general flow field with better accuracy and less computational effort than current methods provide