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简介：Experimentalresultswerecomparedwiththecomputedresultsobtainedfromtheninemostwell-knownmethodsforcomputationofdischargeinacompoundchannel.Theresultsdemonstrateahighaccuracyofthedividedchannelmethodwiththehorizontaldivisionlines,whilethelengthofdivisionlineisincludedwithinthecalculationofthewettedperimeter.Inaddition,asrelativedepthincreases,theresultsoftheallmethodsconvergetoeachotherandalsoincaseofsteeperslopesinlowerrelativedepths,moreagreementsbetweendifferentcalculatedmethodsandexperimentalresultswereobserved.Furthermore,theresultsshowtheeffectsofthemaximummomentumtransferonthehorizontalinterfacebetweenthemainchannelandfloodplains,whilefurtherangulardistancefromthehorizontalinterfacetowardtheverticalinterfacebetweenmainchannelandfloodplainscausesgradualdecreaseofmomentumtransfereffects.

简介：TheaddedresistanceofKVLCC2inshortandregularheadwaveshasbeenstudiedtheoreticallyandexperimentally.Modeltestsareperformedtodeterminehowwelltheasymptoticformula(Faltinsenetal.1980)predictsthetypicallevelofaddedresistanceinshortwaves.Becausetheasymptoticformulaneglectstheeffectsofshipmotions,itiscombinedwiththeoreticalmethodstocalculatetheaddedresistanceinlongwavesusinganfunctiontopredicttheaddedresistanceintheintermediatewavelengthregionwherebothshipmotionsandwavereflectionareimportant.Auniquefeatureofthisexperimentisthattheshipmodelisdividedintothreesegmentstoexploretheaddedresistancedistributionwithrespecttohullsegment.Thispaperdiscussesthesensitivityofexperimentalresultstothequalityoftheincidentregularheadwaves.Moreover,anovelprocedureforanalyzingaddedresistanceisdescribed.Finally,theexperimentallydeterminedaddedresistanceofKVLCC2iscomparedwiththeoreticalresults.Itisshownthattheaddedresistancefromthecombinedtheoreticalmethodsagreeswellwithexperimentalresultsinboththeintermediateandshortwaveregions.Theuseofhullsegmentsshowsthataddedresistanceisconcentratedprimarilyatthebow.

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简介：Acomputercode,ELANEX,includingseveralHomogenous-Equilibrium-Model(HEM)typecavitationmodels,weredeveloped,tonumericallysimulatenaturalcavitationphenomena.Theeffectivenessofthecodewascheckedbycavitationflowsaroundthediskandcylinderbodyforawiderangeofdifferentcavitationnumbers.Cavityprofileswerecomparedwiththeanalyticsolutionofdiskandempiricalformulaefittedfromtheexperimentdata,andcontrastbetweendifferentcavitationmodelswerefulfilledaswell.Thecavitylengthandmaximalcavitydiameterwerefoundtoagreewellwiththeanalyticsolutions,anddetailedcavityprofileswereinaccordancewiththeexperimentalformula.Comparisonwiththehemisphereheadedcylinderbodypresentedagoodagreementofthepressurecoefficientwiththeexperimentdata.Reasonabledrag-forcecoefficientvariationanddrag-forcereductioneffectwereobtained.