Title: Implicit solution of inviscid flows on an unstructured mesh for bodies in large relative motion using a new grid movement scheme

Authors: Karim Mazaheri, Ali Ramezani

Addresses: Aerospace Engineering Department, Sharif University of Technology, Tehran, Iran. ' Aerospace Engineering Department, Sharif University of Technology, Tehran, Iran

Abstract: Both the grid movement scheme and the moving grid solver are considered. A new grid movement scheme for large amplitude moving boundaries such as store separation has been developed. Some popular grid movement methods have been studied to analyse capabilities of this method. In fact, this scheme could be an optimal combination of the overset grids method and the local remeshing as it uses their advantages and avoids some of their disadvantages. To have valid solution in moving grids, two conservation laws, which preserve independences of solution from grid motions, have been considered. These constraints, which are called Geometric Conservation Laws (GCL), have been satisfied implicitly using Arbitrary Lagrangian Eulerain (ALE) formulation. Validation study and a grid independency have been performed using a standard test case. A 2D store separation example is used for comparison of this and other popular algorithms to show their performance in analysis of large amplitude motions.

Keywords: moving boundaries; unstructured grids; compressible flow; implicit solution; geometric conservation laws; inviscid flows; unstructured mesh; grid movement; large amplitude motions; fluid mechanics; CFD; computational fluid dynamics.

DOI: 10.1504/PCFD.2006.010963

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.7, pp.379 - 388

Published online: 22 Sep 2006 *

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