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dc.contributor.authorWu, J. -S.en_US
dc.contributor.authorLian, Y. -Y.en_US
dc.contributor.authorCheng, G.en_US
dc.contributor.authorKoomullil, R. P.en_US
dc.contributor.authorTseng, K. -C.en_US
dc.date.accessioned2014-12-08T15:15:13Z-
dc.date.available2014-12-08T15:15:13Z-
dc.date.issued2006-12-10en_US
dc.identifier.issn0021-9991en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.jcp.2006.04.013en_US
dc.identifier.urihttp://hdl.handle.net/11536/11442-
dc.description.abstractAn efficient and accurate parallel coupled DSMC-NS method using three-dimensional unstructured grid topology is proposed and verified for the simulation of high-speed gas flows involving continuum and rarefied regimes. A domain overlapping strategy, taking advantage of unstructured data format, with Dirichlet-Dirichlet type boundary conditions based on two breakdown parameters is used iteratively to determine the choice of solvers in the spatial domain. The selected breakdown parameters for this study include: (1) a local maximum Knudsen number defined as the ratio of the local mean free path and local characteristic length based on property gradient and (2) a thermal non-equilibrium indicator defined as the ratio of the difference between translational and rotational temperatures to the translational temperature. A supersonic flow (M-infinity = 4) over a quasi-2-D 25 degrees wedge is employed as the first step in verifying the present coupled method. The results of simulation using the coupled method are in excellent agreement with those of the pure DSMC method, which is taken as the benchmark solution. Effects of the size of overlapping regions and the choice of breakdown parameters on the convergence history are discussed. Results show that the proposed iteratively coupled method predicts the results more accurately as compared to the "one-shot" coupled method, which has been often used in practice. Further, a realistic 3-D nitrogen flow, which two near-continuum parallel orifice jets underexpand into a near-vacuum environment, is simulated using the present coupled method to demonstrate its capability. Finally, developments in extending the present method are also outlined in this paper. (c) 2006 Elsevier Inc. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectdirect simulation Monte Carloen_US
dc.subjectcoupled methoden_US
dc.subjectRarefied gas flowen_US
dc.subjectNavier-Stokes solveren_US
dc.subjectsupersonic flowsen_US
dc.titleDevelopment and verification of a coupled DSMC-NS scheme using unstructured meshen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.jcp.2006.04.013en_US
dc.identifier.journalJOURNAL OF COMPUTATIONAL PHYSICSen_US
dc.citation.volume219en_US
dc.citation.issue2en_US
dc.citation.spage579en_US
dc.citation.epage607en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000242816800007-
dc.citation.woscount34-
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