简介：Alaboratoryexperimentwasconductedinsideawindwavetanktoinvestigatethewaveinducedturbulence.Inthisexperiment,thewavesurfaceelevationandvelocitybeneaththewatersurfaceweremeasuredsimultaneouslytoinvestigatetherelationbetweenthewavestatusandwaveinducedturbulence.TheprofileoftheturbulentdissipationrateandReynoldsstresswerecalculatedusingexperimentaldata.Theeffectofthewavestatusonturbulenceisinvestigatedwithregardtothewindwave,swell,andmixedwaveconditions.Itwasdepictedthattheturbulencedecreasedwithincreasingdepthfromthewatersurfaceandthattheturbulencethatwasinducedbyawavewithlargerwavelengthandwaveheightismuchstrongerforthesamewavestatus.Finally,weobservedthatthewindwaveismoreeffectiveinactivatingthewaveinducedturbulence.

简介：Thestressintensityfactors(SIF)consideringarbitrarilydistributedsurfacetractionsareevaluatedbasedonthescaledboundaryfiniteelementmethod(SBFEM).Thesemi-analyticalsolvingprocessforthestressintensityfactorsincludingtheeffectsofsurfacetractionsispresented.ProvidedarethenumericalexamplesfortheevaluationofmodeⅠandⅡstressintensityfactorswithlinearandnon-lineardistributingforcesloadedonthecracksurfaces.Thecrackproblemsofanisotropyandbimaterialinterfacearealsostudiedandthestressintensityfactorsofsingle-edge-crackedorthotropicmaterialandbi-materialinterfaceproblemswithsurfacetractionsarecalculated.Comparisonswiththeanalyticalsolutionsshowthattheproposedapproachiseffectiveandpossesseshighaccuracy.

简介：Thedynamicresponsesofoffshorefixedplatformsundericeloadsareanalysedinthispaper.Theresponsescalculatedincludethedisplacementandthehotspotstressesonthebasisofadynamicequationofice-inducedforcedvibrationforoffshorestructures.Theresultsobtainedcanbecitedandusedforthedesignandoperationofoffshorefixedplatformsagainsticeloading.

简介：Wave-inducedtransientresponseofdisplacements,effectivestressesandporepressureinsaturateseabedaresalvedbyaconsolidationfiniteelementmethod.Theinfluenceoftheresponsestothestabilityofseabedandcoastalstructuresisshownbyanimprovedslicemethodwithcirculararcslipsurface.Dynamicelasticconsolidationtheoryandlinearpermeabilitytheoryareemployedinthesolutionofseabedresponse.Theseabedcanbeconsistedoflayeredsoilwitharbitraryboundaries.Theactingwavecanberegularorirregular.Irregularwavepressureactingonthesurfaceofseabediscalculatedbylinearsuperpositionmethod.Wave-inducedexcessstressontheslipsurfaceisconsideredinthestabilityanalysis.Thespatialandtemporalvariationsofporepressureinsandyseabedcomparewellwithexperiment.Calculationsforaverticalbreakwatershowthatthesafetyfactorofseabedandstructurewilldecreaseifwave-inducedseabedresponseisconsidered.Thescopeofdecreaseismainlyre

简介：Maturationofthe4thphaseoocytesofmudskipperisinducedinvitrobysexpheromones,theextractofovary,testisandseminalvesicle,oxytocinianddeoxycorticosterone(DOC).Maturationratesofoocytesarerelatedtopheromonesandtheirdosages.ThesingleuseofprostaglandinE1(PGE1)isnoteffectiveintheinductionofmaturation,butthecombinationoIPGE1withHCGpromotesoocytematurationrates.Maturationisinducedbyinjectionsoftheextractoftheovaryatdosagesof0.01cm^3/afish,seminalvesicleextractatdosagesof0.1crn3/afish,testisextractatdosageof0.1cm^3/afish,orPGE1atdosageof10μg/fish,respectively.Amongthem,seminalvesicleextractisthemosteffectiveintheinductionofmaturation.Theartificialnests,withtheextractoftheovary,testisorseminalvesicleinside,attractmoreheterosexualmudskippersthanhomosexualmudskipperstoenter.Especially,theextractofseminalvesicleisthemosteffectiveinattractingfemales.Femalemudskipperscouldbeinducedtospawnbytheextractsofovary,testisandseminalvesicleplacedinsideboththeceramicandspongenests.Morespawnedeggsandhigherfertilizationratesareobservedintheceramicneststhaninthespongeones.

简介：Theproblemoficeinducedvibrationiscommontooceanengineeringofcoldregioncountries.Tostudytheiceinducedvibrationofacompliantconicalstructure,aseriesofmodeltestshavebeenperformedandsomebreakthroughprogressesmade.Theicesheetbeforethecompliantconicalstructureisfoundtofailbytwo-timebreakinginthetests.Theprocessoftwo-timebreakingbehavesintwomodes,andthegeneralcontroloftheiceandstructuralconditionsdeterminethemodeinwhichtheiceforcewouldbehave.Twodynamiciceforcefunctionsareestablishedrespectivelyforthetwomodesoftwo-timebreakingprocessinthispaper.Thenumericalsimulationresultsareingoodagreementwiththemeasuredresults,indicatingthatthedynamiciceforcefunctionsgiveninthispapercanfullyreflecttherealsituationofthedynamiciceforceonacompliantconicalstructure.

简介：

简介：AnobviousmotivationofthispaperistoexaminetheeffectivenessofthelateralvibrationcontrolofajackettypeoffshoreplatformwithanAMDcontroldevice,inconjunctionwithH2controlalgorithm,whichisanoptimalfrequen.cydomaincontrolmethodbasedonminimizationofH2normofthesystemtransferfunction.Inthisstudy,theoffshoreplatformismodelednumericallybyuseofthefiniteelementmethod,insteadofalumpedmassmodel.Thisstructuralmodelislatersimplifiedtobesingle-degree-of-freedom(SDOF)systembyextractingthefirstvibrationmodeofthestruc.ture.Thecorresponding″generalized″waveforceisdeterminedbasedonananalyticalapproximationofthefirstmodeshapefunction,thephysicalwaveloadingbeingcalculatedfromthelinearizedMorisonequation.Thisapproachfacilitatesthefilterdesignforthegeneralizedforce.Furthermore,thepresentpaperalsointendstomakenumericalcompari.sonbetweenH2activecontrolandthecorrespondingpassivecontrolusingaTMDwiththesamedeviceparameters.

简介：Themotionofabubblenearthefreesurfaceissolvedbytheboundaryelementmethodbasedonthelinearwaveequation,andtheinfluenceoffluidcompressibilityonbubbledynamicsisanalyzed.Basedonthesolutionofthebubblemotion,thefar-fieldradiationnoiseinducedbythebubbleiscalculatedusingKirchhoffmovingboundaryintegralequation,andtheinfluenceoffreesurfaceonfar-fieldnoiseisresearched.Astheresults,theoscillationamplitudeofthebubbleisweakenedincompressiblefluidcomparedwiththatinincompressiblefluid,andthefreesurfaceamplifiestheeffectoffluidcompressibility.Whenthedistancebetweenthebubbleandanobserverismuchlargerthanthatbetweenthebubbleandfreesurface,thesharpwavetroughofthesoundpressureattheobserveroccurs.Withtheincrementofthedistancebetweenthebubbleandfreesurface,thetimeofthewavetroughappearingisdelayedandthevalueofthewavetroughincrease.Whenthedistancebetweentheobserverandthebubbleisreduced,thesharpwavetroughattheobserverdisappears.

简介：在一个关上的领域的pycnocline被强迫的外部风倾斜并且当风下时，趋于恢复到一个水平位置。如果强迫是弱的，否则内部巨浪和内部独居的波浪出现，内部湖震摆动展出，它用作一个连接串联精力到小规模的过程。与一个骚乱闭合模型一起的二维的非静水力学的代码被构造扩大以前的实验室研究。模型能复制在相应实验室实验观察的所有关键现象。模型结果进一步为相关动态进程的深入的理解用作一个全面、可靠的数据集合。比较分析显示那个非线性的术语赞成内部巨浪和随后的内部独居的波浪的产生，并且线性模型相当预言一般趋势很好。垂直边界能近似反映所有到来的波浪，当斜坡边界为小规模的内部波浪碎和精力驱散用作一个区域时。领域的时间的进化综合运动并且势能也被分析，并且结果显示大约20%起始的可得到的势能在碎的第一个内部波浪期间被失去过程。象格子拓扑学和模型初始化那样的某数字战术简短也被讨论。

简介：Estuarineprocessesinthearcticlagoonsareamongtheleaststudiedbutimportantsubjects,especiallyconsideringtherapidwarmingofarcticwaterwhichmaychangethelengthofice-freeperiodinthesummer.Inthispaper,wind-drivenexchangeflowsinthemicro-tidalElsonLagoonofnorthernAlaskawithmultipleinletsofcontrastingwidthsanddepthsarestudiedwithinsituobservations,statisticalanalysis,numericalexperiments,aregressionmodelonthebasisofdynamics,andremotesensingdata.WatervelocityprofileswereobtainedfromabottomdeployedacousticDopplercurrentprofiler(ADCP)inthenorthwesternEluitkakPassconnectingtheBeaufortSeatotheElsonLagoonduringa4.9dayice-freeperiodinthesummerof2013.Thesubtidalflowisfoundcorrelatedwithwind(R~2value~96%).Frequentlyoccurringeast,northeastandnorthwindsfromthearcticatmospherichigh-andlow-pressuresystemspushwaterfromtheBeaufortSeaintothelagoonthroughthewideinletsontheeasternsideofthelagoon,resultinginanoutwardflowagainstthewindatthenarrownorthwesterninlet.Thecounter-windflowisaresultofanunevenwindforcingactingthroughtheasymmetricinletsanddepth,aneffectof'torque'orvorticity.Undernorthwestwind,theexchangeflowatthenorthwesterninletreversesitsdirection,withinwardflowsthroughtheupwindnorthwesterninletandoutwardflowsthroughthedownwindeasterninlets.AregressionmodelisestablishedbasedonthemomentumequationsandTaylorseriesexpansions.ThemodelisusedtopredictflowsinJulyandAugustof2015andJulyof2017,supportedbyavailableLandsatsatelliteimages.About73%–80%ofthetimetheflowsatEluitkakPassareoutofElsonLagoonforthesummerof2015and2017.Numericalexperimentsareconductedtocorroboratethefindingsandillustratetheeffectsundervariouswindconditions.Aquasi-steadystatebalancebetweenwindforceandsurfacepressuregradientisconfirmed.

简介：Accordingtothecharacteristicsofdeepwatertoptensionedrisers,asimplifiedmodelispresentedtopredictthemulti-modalresponseofvortex-inducedvibration(VIV)innon-uniformflowbasedonenergyequilibriumtheoryandtheexperimentaldatafromVIVself-excitedandforcedoscillationsofrigidcylinders.Theresponseamplitudeofeachmodeisdeterminedbyabalancebetweentheenergyfedintotheriseroverthelock-inregionsandtheenergydissipatedbythefluiddampingovertheremainders.Comparedwiththepreviouspredictionmodels,thismethodcantakefullyaccountoftheintrinsicnatureofVIVforlowmassratiostructuresonlock-inregions,addedmassandnonlinearfluiddampingeffect,etc.Moreover,itisthefirsttimetoproposetheaccuratecalculatingprocedureforVIVamplitudecorrectionfactorbysolvingenergyequilibriumequationandaclosedformsolutionispresentedforthecaseofariserofuniformmassandcross-sectionoscillatinginauniformflow.ThepredictedvaluesshowareasonableagreementwithVIVexperimentsofrisermodelsinsteppedandshearedcurrents.

简介：Thesignificantunderestimationofseasurfacetemperature(SST)andthetemperatureintheupperoceanisoneofcommonproblemsinpresentclimatemodels.Theinfluenceofthewave-inducedmixingonSSTandthetemperatureintheupperoceanwasexaminedbasedonaglobalclimatemodel.Theresultsfromthemodelcoupledwithwave-inducedmixingshowedasignificantimprovementinthesimulationofSSTandthetemperatureintheupperoceancomparedwiththoseoftheoriginalmodelwithoutwaveeffects.Althoughtherehasstillacoldbias,thenewsimulationismuchclosertotheclimatology,especiallyinthenorthernoceanandtropicalocean.Thisstudyindicatesthatsomeimportantphysicalprocessesintheaccuratesimulationoftheoceanmaybeignoredinpresentclimatemodels,andthewave-inducedmixingisoneofthosefactors.Thus,thewave-inducedmixing(ortheeffectofsurfacewaves)shouldbeincorporatedproperlyintoclimatemodelsinordertosimulateorforecasttheocean,thenclimatesystem,moreaccurately.

简介：Theeffectsofwaterdepthonthewave-inducedverticalbendingmomentandshearingforceonaverylargeFPSOarestudiedbyexperimentsandcomputationsforregularandirregularwaves.TherestrictedwaterdepthcompositeGreenfunctionisemployedtodevelopaprogramforthecomputationofthehydrodynamiccoefficientsoftheverylargeFPSOatshallowwater.Athree-segmentmodelwith1:100scaleistestedintheStateKeyLaboratoryofOceanEngineeringatShanghaiJiaoTongUniversityfortheverificationofthenumericalmethod.Theexperimentalandcomputationalresultsshowthatthewaterdepthhasasubstantialeffectonwave-inducedloads.Thewave-inducedverticalloadsincreasewiththedecreaseofwaterdepthforshallowwater.Especially,forultra-shallowwatertheseloadsincreaseveryevidentlywiththedecreaseofwaterdepth.Thelong-termpredictionvaluesofwave-inducedverticalloadsincreasewiththedecreaseoftheratioofwaterdepthtodraught.Thelong-termpredictionvaluesofwave-inducedverticalloadsareabout8％largerthanthosefordeepwaterwhentheratioofwaterdepthtodraughtis3.0.However,waterdepthhardlyaffectsthelongtermpredictionvaluesofwave-inducedloadswhentheratioofwaterdepthtodraughtislargerthan5.0.

简介：Anumericalsimulationandanexperimentalstudyonvortex-inducedmotion(VIM)ofanewtypeofdeepdraftmulti-columnsfloatingdrillingproduction,storageandoffloading(FDPSO)arepresentedinthispaper.Themaindimension,thespecialvariablecross-sectioncolumnandthecabinarrangementoftheoctagonalpontoonareintroducedbasedontheresult.Thenumericalsimulationisadaptedtostudytheeffectsofcurrentincidenceanglesandreducedvelocitiesonthisplatform'sswaymotionresponse.The300mwaterdepthequivalenttruncatedmooringsystemisadoptedforthemodeltests.Themodeltestsarecarriedouttocheckthereliabilityofnumericalsimulation.Theresultsconsistofsurge,swayandyawmotions,aswellasmotiontrajectories.Themaximumswayamplitudesfordifferenttypesofoffshoreplatformisalsostudied.Themainresultsshowthatthepeakfrequenciesofswaymotionunderdifferentcurrentincidenceanglesandreducedvelocitiesvaryaroundthenaturalfrequency.TheanalysisresultofflowfieldindicatesthatthechangeofdistributionofvortexinverticalpresentssignificantinfluencesontheVIMofplatform.ThetrendofswayamplituderatiocurveofthisnewtypeFDPSOdiffersfromtheothertypesofplatform.Under45°currentincidenceangle,theswayamplitudeofthisnewtypeofFDPSOismuchsmallerthanthoseofothertypesofoffshoreplatformat4.4≤Vr≤8.9.Thetypical'8'shapetrajectorydoesnotappearintheplatform'smotiontrajectories.

简介：AftertheapproachbyMellor(2003,2008),thepresentpaperreportsonarepeatedefforttoderivetheequationsforthree-dimensionalwave-inducedcurrent.Viatheverticalmomentumequationandapropercoordinatetransformation,thephase-averagedwavedynamicpressureiswelltreated,andacontinuousanddepth-dependentradiationstresstensor,ratherthanthecontroversialdeltaDiracfunctionatthesurfaceshowninMellor(2008),isprovided.Besides,aphase-averagedverticalmomentumfluxoveraslopingbottomisintroduced.AlltheinconsistenciesinMellor(2003,2008),pointedoutbyArdhuinetal.(2008)andBennisandArdhuin(2011),areovercomeinthepresentlyrevisedequations.Inatestcasewithaslopingseabed,asshowninArdhuinetal.(2008),thewave-drivingforcesderivedinthepresentequationsareingoodbalance,andnospuriousverticalcirculationoccursoutsidethesurfzone,indicatingthatAiry'swavetheoryandtheapproachofMellor(2003,2008)areapplicableforthederivationofthewave-inducedcurrentmodel.

简介：由于胭脂波浪的物理机制的复杂性，rogue-wavestructure相互作用问题的理论学习仍然取得很少进步。为常规形状的结构，然而，给理论分析是可能的，如果流氓波浪的一个相对简单的模型被使用。波浪负担，由作为胭脂波浪的一个直觉的基本模型被知道的一个集中的波浪导致了，在沉没半的柱体之上被学习经分解。集中的波浪由高斯信封波浪是近似的，包含流氓波浪的大多数特征的一个理想的模型。衍射速度潜力通过水平力量的流动地，和公式的分离被导出，弯曲时刻被建议。导出的公式适当地被简化，并且对数字结果通过比较验证了。另外，参数的影响集中的沉没深度和波浪例如集中的度，放，彻底地被调查。

简介：Aseriesofregularwaveexperimentshavebeendoneinalarge-scalewaveflumetoinvestigatethewave-inducedporepressurearoundthesubmarineshallowlyembeddedpipelines.Themodelpipelinesareburiedinthreekindsofsoils,includinggravel,sandandsiltwithdifferentburialdepth.Theinputwaveschangewithheightandperiod.Theresultsshowthattheamplitudesofwave-inducedporepressureincreaseasthewaveperiodincrease,anddecayfromthesurfacetothebottomofseabed.Higherporepressuresarerecordedatthepipelinetopandthelowerporepressuresatthebottom,especiallyinthesandseabed.Thenormalizedpressurearoundpipelinedecreasesastherelativewaterdepth,burialdepthorscatteringparametersincrease.Forthesiltseabed,thewavelettransformhasbeensuccessfullyusedtoanalyzethesignalsofwave-inducedporepressure,andtheoscillatoryandresidualporepressurecanbeextractedbywaveletanalysis.Higheroscillatorypressuresarerecordedatthebottomandthelowerpressuresatthetopofthepipeline.However,higherresidualpressuresarerecordedatthetopandthelowerpressuresatthebottomofthepipeline.

简介：ThewaveCoriolis-Stokes-Force-modifiedoceanmomentumequationsarereviewedinthispaperandthewaveStokestransportispointedouttobepartoftheoceancirculations.UsingtheEuropeanCentreforMedium-RangeWeatherForecasts40-yearreanalysisdata(ERA-40data)andtheSimpleOceanDataAssimilation(SODA)version2.2.4data,themagnitudeofthistransportiscomparedwiththatofwind-drivenSverdruptransportanda5-to-10-precentcontributionbythewaveStokestransportisfound.Bothtransportsarestrongerinborealwinterthaninsummers.Thewaveeffectcanbeeithercontributionorcancellationindifferentseasons.ExaminationwithKuroshiotransportverifiessimilarseasonalvariations.Theclarificationoftheefficientwaveboundaryconditionhelpstounderstandtheroleofwavesinmasstransport.Itactsassurfacewindstressandcanbefunctionaldowntothebottomoftheageostrophiclayer.Thepumpingvelocitiesresultingfromwave-inducedstressarezonallydistributedandaresignificantinrelativelyhighlatitudes.Furtherworkwillfocusonthemodelperformanceofthewave-stress-changed-boundaryandtheroleofswellsintheeasternpartoftheoceans.

简介：streamwise有对称的旋涡在第一个不稳定性范围流的圆形的柱体的导致流动的颤动被调查，并且为动态反应预言的一个wake振荡器模型被建议。一条途径被使用在现在的模型校准实验参数；数字、试验性的结果与相比验证建议模型。现在的预言模型精确、足够地简单容易在实践被使用，这能被发现。