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NASA Technical Reports Server (NTRS) 20150012291: Robust and Simple... |
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by NASA Technical Reports Server (NTRS) |
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This paper reports on a significant advance in the area |
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of nonreflecting boundary conditions (NRBCs) for unsteady |
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flow computations. As a part of t he development of t he |
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space-time conservation element and solution element |
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(CE/SE) method, sets of NRBCs for 1D Euler problems are |
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developed without using any characteristics- based |
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techniques. These conditions are much simpler than those |
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commonly reported in the literature, yet so robust that |
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they are applicable to subsonic, transonic and supersonic |
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flows even in the presence of discontinuities. In |
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addition, the straightforward multidimensional extensions |
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of the present 1D NRBCs have been shown numerically to be |
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equally simple and robust. The paper details the |
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theoretical underpinning of these NRBCs, and explains t |
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heir unique robustness and accuracy in terms of t he |
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conservation of space-time fluxes. Some numerical results |
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for an extended Sod's shock-tube problem, illustrating |
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the effectiveness of the present NRBCs are included, |
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together with an associated simple Fortran computer |
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program. As a preliminary to the present development, a |
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review of the basic CE/SE schemes is also included. |
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Date Published: 2016-10-26 13:48:52 |
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Identifier: NASA_NTRS_Archive_20150012291 |
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Item Size: 38294372 |
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Language: english |
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Media Type: texts |
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