Title of article
Modelingofabuoyancy-drivenflowexperimentattheROCOMtestfacilityusingtheCFDcodesCFX-5andTrio_UOriginalResearchArticle
Author/Authors
ThomasH?hne، نويسنده , , S?renKliem، نويسنده , , UlrichBieder، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
17
From page
1309
To page
1325
Abstract
Theinfluenceofdensitydifferencesonthemixingoftheprimaryloopinventoryandtheemergencycorecooling(ECC)waterinthedowncomerofapressurizedwaterreactor(PWR)wasanalyzedattheROssendorfCOolantMixing(ROCOM)testfacility.ROCOMisa1:5scaledmodelofaGermanPWR,andhasbeendesignedforcoolantmixingstudies.Itisequippedwithadvancedinstrumentation,whichdelivershigh-resolutioninformationfortemperatureorboronconcentrationfields.
Anexperimentwith5%ofthedesignflowrateinoneloopand10%densitydifferencebetweentheECCandloopwaterwasselectedforvalidationoftheCFDsoftwarepackagesCFX-5andTrio_U.Twosimilarmesheswithapproximately2millioncontrolvolumeswereusedforthecalculations.TheeffectsofturbulenceonthemeanflowweremodeledwithaReynoldsstressturbulencemodelinCFX-5andaLESapproachinTrio_U.CFX-5isacommercialcodepackageofferedfromANSYSInc.andTrio_UisaCFDtoolwhichisdevelopedbytheCEA-Grenoble,France.
Theresultsoftheexperimentandofthenumericalcalculationsshowthatmixingisdominatedbybuoyancyeffects:athighermassflowrates(closetonominalconditions)theinjectedslugpropagatesinthecircumferentialdirectionaroundthecorebarrel.Buoyancyeffectsreducethispropagation.TheECCwaterfallsinanalmostverticalpathandreachesthelowerdowncomersensordirectlybelowtheinletnozzle.Therefore,densityeffectsplayanimportantroleduringnaturalconvectionwithECCinjectioninPWRs.BothCFDcodeswereabletopredictwelltheobservedflowpatternsandmixingphenomena.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
896081
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