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1、OceanEngineering54(2012)132–141ContentslistsavailableatSciVerseScienceDirectOceanEngineeringjournalhomepage:www.elsevier.com/locate/oceanengNumericalstudyontheeffectsofunevenbottomtopographyonfreakwavesnChengCui,NingChuanZhang,YuXiuYu,JingBoLiStateKeyLaboratoryofCoas
2、talandOffshoreEngineering,DalianUniversityofTechnology,Dalian,Liaoning,ChinaarticleinfoabstractArticlehistory:AnumericalmodelisbuiltbyusinganimprovedVOFmethodcoupledwithanincompressibleNavier–Received8May2011Stokessolver.Exploitingthemodel,thefreakwaveformationduetot
3、hedispersivefocusingmechanismAccepted30June2012isinvestigatednumericallywithoutunevenbottomsandinpresenceofunevenbottoms.DuringthefreakAvailableonline5August2012wavetransformationoveranunevenbottominfinitewater,combinedeffectsofshoaling,refractionandKeywords:reflection
4、canmodifytheexternalcharacteristicsoffreakwaves,andalsocancomplicatetheenergyFreakwavetransfers.Furthermore,waveletanalysismethodisadoptedtoanalyzethebehavioroftheinstantaneousVOFmethodenergystructureoffreakwaves.Itisfoundthatwhenthebottomsvaryinheight,theexternalUne
5、venbottomtopographycharacteristicparametersandhighfrequencyenergyshowasimilartrend,butthevaluemaybequiteWaveletanalysisdifferentduetothedifferenceinlocalcharacteristicofthebottom.&2012ElsevierLtd.Allrightsreserved.1.IntroductionToubouletal.(2006)experimentallyandnume
6、ricallyinvesti-gatedthedirecteffectofthewindonafreakwaveeventFreakwaveisatypeofextremelylargetransientwaterwave,generatedbymeansofadispersivefocusingmechanism.Thebeingclosetobreakingandofasymmetryinbothverticalandresultssuggestthatthedurationofthefreakwaveeventincrea
7、seshorizontaldirection.Inthetime-frequencyspectrumoffreakwiththewindvelocity,andthepointwherethewavesmergehaswaves,strongenergydensityisinstantlysurgedandseeminglyashiftinthedownstreamdirection,whichisduetotheactionofcarriedovertothehighfrequencycomponentsattheinstan
8、tthethecurrentinducedbythewind.freakwaveoccurs(LiuandMori,2000),thereforeseveredamagesPetersonetal.(2003)presentedthatnon-linearint
