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1、DiffractionComputationInPhase-AveragedWaveModelJiaXiao1PanJun-ning21Estuarine&CoastalScienceResearchCenter,201201,ShangHai,Chinajiaxiao1984@126.com2NanjingHydraulicResearchInstitute,210029,NanJing,ChinaAbstract:Comparingtophase-resolvingnumericalwavemodel,phase-averag
2、edwavemodelhavelotsofadvantages,especiallyontimeeffencyanddetailedsourceterms.Butdiffractioncannotbeconsideredinthesekindmodels.SinceSWAN(SimulatingWAveNearshore)Version40.51,diffractionisintroducedtothemodelwithphase-decoupledmethod.Inthispaper,theapplicabilityofthed
3、iffractioncalculationintheSWANmodelistestedbycalculationwithhalf-infinitebreakwaterandharbourbathymetry.Then,improvedeikonalequationinmild-slopeequationisappliedtotheSWANmodeltoimprovethediffractionterm,accuracyandconvergencearevalidated.Keywords:numericalwavemodel,ph
4、ase-averagedmodel,diffraction,SWANmodel,numericalconvergence1.IntroduceAmongmanykindsofnumericalwavemodels,phase-averagedwavemodels(suchasWAMmodel,SWANmodel)havemanyadvantages,suchasits’state-of-the-artsourceterms,its’computationalefficiency,coupledcalculationwithothe
5、rhydrodynamicfactorsandsoon.But,diffractioncalculationcannotbesimulatedinallphase-averagedmodels.Diffractionsimulationshoulduseotherphase-resolvingmodels(suchasMildSlopeEquation,BoussinesqEquation).Becauseadvantagesinthephase-averagedmodels,manyresearcherstriedalottoi
6、ntroducediffractiontophase-averagedmodels[1].NewversionofSWANmodel,sinceversion40.51[2]usesphase-decoupledmethodtocalculatediffraction.Afterthat,feasibilityandapplicabilityareanalysed.Enet[3]calculateswavefieldbehindsemi-infinitebreakwater,andcomparetheresultswithanal
7、yticalsolutions.Healsogivesrequirementsthatmakediffractioncalculationconvergence.NelsonViolante-Carvalho[4]studiesirregularwaves’diffractionandreflectioninharbourbasin,andcomparestheresultswithphysicalmodel’sresultsandMIKE21BW’sresults.Inthispaper,improvementofthediff
8、ractioncalculationisintroducedintheSWANmodel.Then,semi-infinitebreakwatercaseandharbourcasearecalculatedtofindthefeasibility
