Author/Authors :
G.Yadigaroglu، نويسنده , , M.Simiano، نويسنده , , R.Milenkovic، نويسنده , , J.Kubasch، نويسنده , , M. Milelli، نويسنده , , R.Zboray، نويسنده , , F.DeCachard، نويسنده , , B.Smith، نويسنده , , D.Lakehal، نويسنده , , B.Sigg، نويسنده ,
Abstract :
Thepaperdiscussesfirstcurrentcomputationaltrendsrelatedtoreactorsafetyproblemsanddevelopmentsneeded,aswellastheneedfornewkindsofmuchmoredetailedexperimentaldataforthevalidationofthenewmethodsandcodes.ThenumerousbubblyflowexperimentsconductedduringthelastdecadeatPSIarethenreviewedandputinperspectivewithregardstotheneedsoftheanalysts.Thelatestexperimentsproducedfirst-of-a-kindsetsofexperimentaldatafrombubblyplumesandjets.Someofthesedatawereconditionallyensembleorphaseaveragedtoseparatetheeffectsoflarge-scalemeanderingandoscillationsorcoherentstructuresfromthetime-dependentsmall-scaleeffects;thentheReynoldsstresstermscouldbeproperlyidentified.Thelargedatasetsthathavebeencreatedcanbefurtherminedtoextractadditionalinformationforthetwo-phaseflowanalyst.ThecompanionanalyticaldevelopmentsandsimulationsofbubblyflowswithRANSandLESmethodsarediscussed.LESmethodsareneededtoovercomesomeofthebasiclimitationsofRANSsimulations.
