UNSTEADY／STEADY NUMERICAL SIMULATION OF THREE-DIMENSIONAL INCOMPRESSIBLE NAVIER-STOKES EQUATIONS ON ARTIFICIAL COMPRESSIBILITY-中国期刊网

摘要 Amixedalgorithmofcentralandupwinddifferenceschemeforthesolutionofsteady/unsteadyincompressibleNavier-Stokesequationsispresented.Thealgorithmisbasedonthemethodofartificialcompressibilityandusesathird-orderflux-differencesplittingtechniquefortheconvectivetermsandthesecond-ordercentraldifferencefortheviscousterms.Thenumericalfluxofsemi-discreteequationsiscomputedbyusingtheRoeapproximation.Timeaccuracyisobtainedinthenumericalsolutionsbysubiteratingtheequationsinpseudotimeforeachphysicaltimestep.ThealgebraicturbulencemodelofBaldwin-Lomaxisulsedinthiswork.Asexamples,thesolutionsofflowthroughtwodimensionalflat,airfoil,prolatespheroidandcerebralaneurysmarecomputedandtheresultsarecomparedwithexperimentaldata.Theresultsshowthatthecoefficientofpressureandskinfrictionareagreementwithexperimentaldata,thelargestdiscrepancyoccurintheseparationregionwherethelagebraicturbulencemodelofBaldwin-Lomaxcouldnotexactlypredicttheflow.

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UNSTEADY／STEADY NUMERICAL SIMULATION OF THREE-DIMENSIONAL INCOMPRESSIBLE NAVIER-STOKES EQUATIONS ON ARTIFICIAL COMPRESSIBILITY

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UNSTEADY／STEADY NUMERICAL SIMULATION OF THREE-DIMENSIONAL INCOMPRESSIBLE NAVIER-STOKES EQUATIONS ON ARTIFICIAL COMPRESSIBILITY

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