简介:Asecond-ordermixingdifferenceschemewithalimitingfactorisdeducedwiththereconstructiongradientmethodandappliedtodiscretizingtheNavier-Stokesequationinanunstructuredgrid.Thetransformofnonorthogonaldiffusionitemsgeneratedbytheschemeindiscreteequationsisprovided.TheDelaunaytriangulationmethodisimprovedtogeneratetheunstructuredgrid.ThecomputingprogrambasedontheSIMPLEalgorithminanunstructuredgridiscompiledandusedtosolvethediscreteequationsoftwotypesofincompressibleviscousflow.Thenumericalsimulationresultsofthelaminarflowdrivenbylidincavityandflowbehindacylinderarecomparedwiththetheoreticalsolutionandexperimentaldatarespectively.Intheformercase,agoodagreementisachievedinthemainvelocityanddragcoefficientcurve.Inthelattercase,thenumericalstructureanddevelopmentofvortexunderseveralReynoldsnumbersmatchwellwiththatoftheexperiment.Itisindicatedthatthefactordifferenceschemeisofhigheraccuracy,andfeasibletobeappliedtoNavier-Stokesequation.