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Application of a low order panel method to complex three-dimensional internal flow problemsAn evaluation of the ability of a low order panel method to predict complex three-dimensional internal flow fields was made. The computer code VSAERO was used as a basis for the evaluation. Guidelines for modeling internal flow geometries were determined and the effects of varying the boundary conditions and the use of numerical approximations on the solutions accuracy were studied. Several test cases were run and the results were compared with theoretical or experimental results. Modeling an internal flow geometry as a closed box with normal velocities specified on an inlet and exit face provided accurate results and gave the user control over the boundary conditions. The values of the boundary conditions greatly influenced the amount of leakage an internal flow geometry suffered and could be adjusted to eliminate leakage. The use of the far-field approximation to reduce computation time influenced the accuracy of a solution and was coupled with the values of the boundary conditions needed to eliminate leakage. The error induced in the influence coefficients by using the far-field approximation was found to be dependent on the type of influence coefficient, the far-field radius, and the aspect ratio of the panels.
Document ID
19860021529
Document Type
Contractor Report (CR)
Authors
Ashby, D. L. (California Polytechnic State Univ. San Luis Obispo, CA, United States)
Sandlin, D. R. (California Polytechnic State Univ. San Luis Obispo, CA, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1986
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
NASA-CR-177424
NAS 1.26:177424
Funding Number(s)
CONTRACT_GRANT: NCC2-226
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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