Parallel Overset-Grid Euler Solution of Generic Wing Pylon and Finned Store.

Abstract

Introduction S INCE the 1980s, after Steger et al.1 solved twoand threedimensional multibody configurations, overset (chimera) grid systems became very popular because of their advantages in easing the grid generation. Later in 1994, Kao et al.2 used overset grids in order to perform grid adaptation in the flow regions where higher gradients exist. Tuncer3 preferred to use overset grids for unsteady Navier–Stokes solutions of sinusoidally pitching airfoil. Cho et al.4 solved the generic wing/pylon/finned store (WPFS) configuration as a steady three-dimensional problem by using the overset grids. Later Lee et al.5 used overset grid system for the solution of a store release problem. Furthermore, Holst6 also developed a new search algorithm for locating the donor cells associated with the overset grid system used in the solution of wing-fuselage geometry by full potential equations. In the present work, a three-dimensional finite differencing scheme, multiblock structured Euler and thin-layer Navier–Stokes7 solver is modified in order to enhance overset grid capability and to run in a parallel-computing environment. A wing-store configuration and Eglin WPFS8 configuration are selected as the test cases for the validation purposes.