Page 140 - 《水资源与水工程学报》2023年第4期
P. 140
!34 " ! 4 # & ' ( ) & * + , - Vol.34No.4
2023 $ 8% JournalofWaterResources&WaterEngineering Aug.,2023
DOI:10.11705/j.issn.1672-643X.2023.04.16
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MNOPQ:TV131.3 7RSTU:A 7VWQ:1672643X(2023)04013610
Numericalsimulationonhydrauliccharacteristicsofsteady
flowinchannelswithpartialicecover
2
2
1,2
CHENGang ,JINDong,LAIYancheng,LIYingjin 2
(1.StateKeyLaboratoryofHydrology-WaterResourcesandHydraulicEngineering,HohaiUniversity,Nianjing210098,China;
2.YunnanInstituteofWaterandHydropowerEngineeringInvestigation,Kunming650021,China)
Abstract:TheFluentbasedReynoldsstressmodelwasappliedtosimulatethehydrauliccharacteristics
ofsteadyuniformflowinchannelswithpartialicecoverintermsofstreamwisevelocity ,secondaryflow,
Reynoldsstress,andturbulentkineticenergy.Thesimulatedresultsshowthattheformationofborderice
resultsintheredistributionofundericeflowonthecrosssection,thevelocityincreasesintheopenwater
subsection,butdecreasesintheundericesubsection.Theresultinglateralmomentumtransferproduces
acomplexsecondaryflowstructure,theshape,number,sizeandlocationofthevorticesvarywiththe
coverageoficecover.ThedistributionofReynoldsstressiscomplexwithnegativevalueinthenearcover
regionoftheundericesubsection ,andthenegativeregioniscloselyrelatedtotheicecoverage,which
formsaconvexshapetowardstheopenwatersubsection.Thedifferencesintheroughnessoficecover,
bedandsidewallresultinthevariationofturbulentkineticenergyinthecrosssection.Theturbulentki
neticenergyislargerintheundericesubsectionthanthatintheopenwatersubsection,indicatingthat
theformationofbordericehascomplicatedeffectsontheturbulencestructureoftheundericeflow.
Keywords:icecover;hydrauliccharacteristics;numericalsimulation;Reynoldsstressmodel
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