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By G. S. Deiwert, E. Venkatapathy, C. Davies, J. Djomehri and K. AbrahamsonG. S. Deiwen, E. Venkatapathy, C. Davies, J. Djomehri and K. Abrahamson


A directional-split, modular, user-friendly grid point distribution code is applied to several test problems. The code is self-adaptive in the sense that grid point spacing is determined by user-specified constants denoting maximum and minimum grid spacings and constants relating the relative influence of smoothness and orthogonality. Estimates of truncation error, in terms of flow-field gradients and/or geometric features, are used to determine the point distribution. Points are redistributed along grid lines in a specified direction in an elliptic manner over a user-specified subdomain, while orthogonality and smoothness are controlled in a parabolic (marching) manner in the remaining directions. Multidlrectional adaption is achieved by sequential application of the method in each coordinate direction. The flow-field solution is redistributed onto the newly distributed grid points after each unidirectional adaption by a simple one-dimensional interpolation scheme. For time-accurate schemes such interpolation is not necessary and time-dependent metrics are carried in the fluid dynamic equations to account for grid movement. THE METHOD The grid adaption method used herein is a pointwise redistribution of node points based on an approximation of the three-dimensional variational method of Brackbill and Saltzman (1982). Their variationa

Year: 1989
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