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Application of a self-adaptive grid method to complex flowsA 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. Multidirectional 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.
Document ID
19900004008
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Deiwert, G. S. (NASA Ames Research Center Moffett Field, CA., United States)
Venkatapathy, E. (Eloret Corp. Sunnyvale, CA., United States)
Davies, C. (Sterling Software Palo Alto, CA., United States)
Djomehri, J. (NASA Ames Research Center Moffett Field, CA., United States)
Abrahamson, K. (Boeing Military Airplane Development Wichita, KS., United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1989
Subject Category
Aeronautics (General)
Report/Patent Number
A-89172
NASA-TM-102223
NAS 1.15:102223
Accession Number
90N13324
Funding Number(s)
PROJECT: RTOP 506-40-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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