AN ADAPTIVE GRID GENERATOR FOR STRUCTURED GRIDS

Authors
  1. Hall, D.J.
  2. Zingg, D.W.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);Toronto Univ, Downsview ONT (CAN) Inst for Aerospace Studies
Abstract
Computer programs have been developed for the generation of two-dimensional adaptive structure grids. A method has been selected in which source terms are added to an elliptic grid generation system to allow adaptation to high gradient regions. The adaptive source terms, which are derived from equidistribution of positive weight functions, are linearly combined with geometric source terms. The geometric source terms allow the off-boundary spacing and angle of the transverse grid lines to be controlled at boundaries of the domain. Thus, this formulation combines adaptation with smoothness, near-orthogonality of coordinate curves, and control over the grid characteristics in boundary regions. The adaptive grid generator has been tested on several test cases including viscous, compressible fluid flows about airfoil sections. Parametric studies have been performed for the airfoil test cases to determine optimum parameters for adaptation to boundary layers and streamwise pressure gradients. Adaptive results are compared to grid-independent solutions to quantify the reduction in numerical error due to adaptation.
Keywords
GRID GENERATOR
Report Number
DRES-CR-93-35 — Contractor Report
Date of publication
01 Dec 1992
Number of Pages
169
DSTKIM No
94-04630
CANDIS No
140280
Format(s):
Hardcopy;Originator's fiche received by DSIS

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