Cogeneration and wheeling of electric power /
The goal of this thesis is to develop an efficient and
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| Format: | Book |
| Language: | English |
| Published: |
Tulsa, Okla. :
PennWell Pub. Co.,
[1995]
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| Subjects: |
| Summary: | The goal of this thesis is to develop an efficient and robust locally preconditioned multigrid algorithm for the two-dimensional Euler equations using an up-wind discrimination. Two multigrid coarsening strategies, full-coarsening and semi-coarsening, are studied to determine which is more efficient. In particular, we employ a block Jacobi iterative scheme due to its excellent high frequency damping ability and its simplicity. In addition, the Turkel preconditioned is introduced into the flux formulation to increase accuracy and efficiency for low freestream Mach numbers. A new technique to limit preconditioning based on local information has been developed to combat a stagnation point robustness problem. Numerical tests performed on a NCA 0012 airfoil, a bump flow, and a duct flow show semi-coarsening requires O(N) operations and is overwhelmingly superior to full-coarsening which requires O(N1) operations. The new limiting technique for the preconditioned appears efficient and robust, but more tests are needed in the future to verify its effectiveness. |
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| Physical Description: | xviii, 195 pages : illustrations, map ; 23 cm. |
| ISBN: | 0878144544 |