Analysis of Three-Dimensional Transonic Potential Flows Using Optimum Grid.
Final rept. 1 Jan-31 Dec 82,
INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS SCHOOL OF ENGINEERING AND TECHNOLOGY
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A three-dimensional finite element procedure is developed for the analysis of three-dimensional transonic flows and applied to the analysis of wing-body combinations. A finite element grid generation scheme for three-dimensional bodies with complex geometries is presented. The design of efficient, body-fitted computational grids with isoparametric mappings, as well as the application of higher-order finite elements in analyzing transonic potential flows are investigated. Two different computational grids were designed and studied with a numerical scheme based on the density upwinding in the supersonic regions. A pseudo-unsteady type formulation is employed in determining a steady-state solution. It is concluded that the grid generation scheme is quite flexible and efficient for generating solution adaptive grids and providing local refinements in the sensitive flow regions. Also, it is shown that the employed numerical scheme with higher-order elements at flow regions of high gradients produced results which compare favorable with experimental data. Author
- Fluid Mechanics