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dc.contributor.authorWu, JSen_US
dc.contributor.authorTseng, KCen_US
dc.date.accessioned2014-12-08T15:19:10Z-
dc.date.available2014-12-08T15:19:10Z-
dc.date.issued2005-05-07en_US
dc.identifier.issn0029-5981en_US
dc.identifier.urihttp://dx.doi.org/10.1002/nme.1232en_US
dc.identifier.urihttp://hdl.handle.net/11536/13726-
dc.description.abstractA general parallel direct simulation Monte Carlo method using unstructured mesh is introduced, which incorporates a multi-level graph-partitioning technique to dynamically decompose the computational domain. The current DSMC method is implemented on an unstructured mesh using particle ray-tracing technique, which takes the advantages of the cell connectivity information. In addition, various strategies applying the stop at rise (SAR) (IEEE Trans Comput 1988; 39:1073-1087) scheme is studied to determine how frequent the domain should be re-decomposed. A high-speed, bottom-driven cavity flow, including small, medium and large problems, based on the number of particles and cells, are simulated. Corresponding analysis of parallel performance is reported on IBM-SP2 parallel machine up to 64 processors. Analysis shows that degree of imbalance among processors with dynamic load balancing is about 1/6 - 1/2 of that without dynamic load balancing. Detailed time analysis shows that degree of imbalance levels off very rapidly at a relatively low value with increasing number of processors when applying dynamic load balancing, which makes the large problem size fairly scalable for processors more than 64. In general, optimal frequency of activating SAR scheme decreases with problem size. At the end, the method is applied to compute two two-dimensional hypersonic flows, a three-dimensional hypersonic flow and a three-dimensional near-continuum twin-jet gas flow to demonstrate its superior computational capability and compare with experimental data and previous simulation data wherever available. Copyright (c) 2005 John Wiley A Sons, Ltd.en_US
dc.language.isoen_USen_US
dc.subjectdirect simulation Monte Carloen_US
dc.subjectparallelen_US
dc.subjectgraph partitionen_US
dc.subjectdynamic domain decompositionen_US
dc.subjecthypersonic flowen_US
dc.subjectnear-continuumen_US
dc.titleParallel DSMC method using dynamic domain decompositionen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/nme.1232en_US
dc.identifier.journalINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERINGen_US
dc.citation.volume63en_US
dc.citation.issue1en_US
dc.citation.spage37en_US
dc.citation.epage76en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000228562800002-
dc.citation.woscount27-
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