Title of article
Validationofatransientthermal-fluidsystemsCFDmodelforapackedbedhightemperaturegas-coolednuclearreactorOriginalResearchArticle
Author/Authors
P.G.Rousseau، نويسنده , , C.G.duToit، نويسنده , , W.A.Landman، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
10
From page
555
To page
564
Abstract
Thispaperprovidesanoverviewofthetheoreticalbasisforanewthermal-fluidsystemsCFDsimulationmodelforhightemperaturegas-cooledreactors,containedintheFlownexsoftwarecode.Flownexprovidesfordetailedsteady-stateandtransientthermal-fluidsimulationsofthecompletepowerplant,fullyintegratedwithcoreneutronicsandcontrolleralgorithms.Thereactormodelisfoundedonafundamentalapproachfortheconservationofmass,momentumandenergyforthecompressiblefluidflowingthroughafixedbed,aswellastheheattransferinthepebblesandcorestructures.Thetime-wiseintegrationoftheresultingdifferentialequationsisbasedonanimplicitpressurecorrectionalgorithm.Thisallowsfortheuseofratherlargetimestepsmakingitverysuitableforsimulatingtheslowtransientsthatcanbeexpectedtofollowincidentslikereactorshutdowns.ThepaperalsocomparestheFlownexresultsforfourtransienttestswiththemeasuredresultsfromtheSANAtestfacilityaswellastotheresultsofsimulationswiththeThermix/DIREKTcodethatweredoneattheResearchCentre,Jülich.TheFlownexresultscomparewellwiththeThermix/DIREKTresultsforallthecasespresentedhere.Goodcomparisonwasalsoobtainedbetweenthesimulatedandmeasuredresults,exceptattwopointswithinthepebblebedneartheinnerwall.Thefactthatquickcomputersimulationtimeswereobtainedindicatesthatthenewmodelindeedachievesafinebalancebetweenaccuracyandsimplicity.However,thediscrepanciesobtainedatthetwopointsneartheinnerwall,togetherwiththefactthatadditionaluncertaintywasintroducedintheoriginalSANAtestset-upbynotbeingabletocontrolthetemperatureoftheouterwall,highlighttheneedforadditionalsystematicteststobeperformedinordertobettervalidatethenewmodel.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
896017
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