简介：Applicationsofcomputationalfluiddynamic(CFD)tothemaritimeindustrycontinuetogrowwiththeincreasingdevelopmentofcomputers.Numericalapproacheshaveevolvedtoalevelofaccuracywhichallowsthemtobeappliedforhydrodynamiccomputationsinindustryareas.Hydrodynamictests,especiallyplanar-motion-mechanism(PMM)testsaresimulatedbyCFDsoftware-FLUENT,andallofthecorrespondinghydrodynamiccoefficientsareobtained,whichsatisfytheneedofestablishingthesimulationsystemtoevaluatemaneuverabilityofvehiclesduringtheautonomousunderwatervehicleschemedesignstage.Theestablishedsimulationsystemperformedwellintests.

简介：压载水管理公约是针对压载水污染的一项国际公约,于2016年11月生效.立足于此,首先概述了压载水管理公约的内容,然后简要地分析了压载水管理公约的动向,最后,就我国的履约对策提出了几点建议,包括强化立法保护海洋环境、加快自主研发进程、密切国际合作、航运企业积极改进.

简介：Inordertostudycavitationcharacteristicsofa2-Dhydrofoil,themethodthatcombinesnonlinearcavitationmodelandmixed-iterationisusedtopredictandanalyzethecavitationperformanceofhydrofoils.ThecavitationelementsarenonlinearlydisposedbasedontheGreenformulaandperturbationpotentialpanelmethod.Atthesametime,themethodthatcombinescavityshapeforfixedcavitylength(CSCL)iterationandcavityshapeforfixedcavitationnumber(CSCN)iterationisusedtoworkoutthethicknessandlengthofhydrofoilcavitations.Throughanalysisofcalculationresults,itcanbeconcludedthatthejumpofpressureandvelocitypotentiallyexistbetweencavitationendareaandnon-cavitationsareaonsuctionsurfacewhencavitationoccursonhydrofoil.Incertainanglesofattack,thecavitationnumberhasanegativeimpactonthelengthofcavitations.Andunderthesameangleofattackandcavitationnumber,thebiggerthethicknessofthehydrofoil,theshorterthecavitationslength.

简介：<正>19–24October2014SingaporeCONFERENCETHEMESTheoverallaimoftheICHDConferenceistoprovideaforumforparticipantsfromaroundtheworldtoreview,discussandpresentthelatestdevelopmentsinthebroaddisciplineofhydrodynamicsandfluidmechanics.ThefirstInternationalConferenceonHydrodynamics(ICHD)wasinitiatedin1994inWuxi,China.Sincethen,9moreICHDconferenceswereheldsubsequentlyinHongKong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,ShanghaiandStPetersburg.EvidentlytheICHDconferencehasbecomeanimportanteventamongacademics,

简介：TheReynolds-averagedNavier-Stokes(RANS)method,alongwiththeFluentsoftwarepackage,wasusedtostudythesteadyandunsteadyinteractionofpropellersandrudderswithadditionalthrustfins.Theslidingmeshmodelwasemployedtosimulateunsteadyinteractionsbetweentheblades,therudderandthethrustfins.Basedonthenumericalresults,thepressuredistributiononthepropellerandtheefficiencyofthefinswerecalculatedasafunctionoftheattackangle.TheRANSresultswerecomparedwithresultscalculatedbythepotentialmethod.ItwasfoundthattheresultsforthepotentialmethodandtheRANSmethodhavegoodconsistency,buttheyyieldmaximumefficienciesforthefins,andthuscorrespondingattackangles,thatarenotidentical.

简介：采用一种新的方法预估导管螺旋桨的水动力性能；导管和螺旋桨均采用基于速度势的面元法，它们间的影响通过相互的诱导速度势数值迭代来体现．与诱导速度体现相互影响的方法相比，本文方法可节省编程及计算时间；对JD系列导管螺旋桨的计算与实验结果的比较表明，该方法可以有效地预估导管螺旋桨的水动力性能．

简介：采用一种新的方法预估导管螺旋桨的水动力性能;导管和螺旋桨均采用基于速度势的面元法,它们间的影响通过相互的诱导速度势数值迭代来体现.与诱导速度体现相互影响的方法相比,本文方法可节省编程及计算时间;对JD系列导管螺旋桨的计算与实验结果的比较表明,该方法可以有效地预估导管螺旋桨的水动力性能.

简介：“学-导多元互动”教学模式是依据相关教育理论、教育观念以及结合现代远程开放教育发展的要求和实践而形成的重在体现以人为本，真正做到“以学习者为中心”，为学习者提供多元的服务，满足学习者的学习需要和求知愿望，构建终身学习体系和学习型社会的教育思想的教学模式。文章以视觉传达设计教学为例，从“学-导多元互动”教学模式的内涵、教学效果及对高校艺术设计教育的启示三个方面加以阐述，希望对于高校艺术设计教育教学模式的改革起到一些借鉴作用。