简介：Thehorizontalmigrationofproppantwasnumericallyinvestigatedwithatwo-fluidmodel,inwhichtheinteractionbetweenfracturingfluidandproppant,alongwiththatamongproppantswastakenintoaccountthroughinterphaseforces.Themigrationprocessandthevolumetricconcentrationoftheproppantwereexaminedundervariousconditions,andtheaveragedvolumetricconcentrationoftheproppantwasobtained.Thepresentresearchmightbeusefulintheprocessdesignofthehydraulicfracturingintheoilfields.

简介：Hydrodynamiccharactersonahorizontal,thin,rigidplatelocatedbeneaththefreesurfacearenumericallyinvestigated.Assumingalinear,time-harmonicpotentialflowandutilizingGreenidentity,thegoverningLaplaceequationcanbesimplifiedintoFredholmintegralequationofthesecondkind.Supposinglinear-orderdiscontinuouselementsalongintersectingverticalboundaries,andbyuseoftheboundaryelementmethod,numericalsolutionaboutsourcestrengthdistributionontheplatecanbechangedintoaseriesofalgebraicequations.The3DGreenfunctionisintroducedtosetuptheintegralequations,andtheGMRESsolverisperformedforsolvingthelargedenselinearsystemofequations.Theadded-mass,dampingforceandexcitingforceareevaluateddirectlyfromtheequations.Itisfoundthattheadded-masscoefficientbecomesnegativeforarangeoffrequencieswhentheplateissufficientlyclosetothefreesurface.

简介：Atypeofportwithamovablecoverisdesignedtoincreaseinitialdilutionandpreventseawaterandsedimentsfromintrudingintooutfallsystems.Horizontalradialjetspro-ducedbythistypeofportinacurrentareinvestigatedexperimentallyandtheoretically.TheanalysisbasedonReynolds’equationsandself-similarityhypothesisshowsthatthemaximumve-locityofradialjetsdecayswithr-1.5.Therelationshipsbetweenthewidth,thickness,averagedi-lutionofasubmergedwastefieldalongflow,andtheparametersoftheport,jetandambientareestablishedquantitativelyandverifiedbyexperiments.Itisdemonstratedthatthedilutionofhorizontalradialjetsismuchhigherthanthatofverticalroundjetsandthesurfaceboilpointoftheformerismuchmoredistantthanthatofthelatter.

简介：方面折射是水平角调查的主要错误来源，但是它几乎没由分析影响在方面上有小影响在theultrahigh精确上大气违犯方面和角度调查ing。选择面向的方向对距离关键，在分成三角形定量的角度测量联网怎么在角度测量期间选择面向的方向被介绍，并且检查qua的工具点亮与Georobot调查汽车也向前被带。最后，当处理并且调查超离频精确的分成三角形定量网络时，减少方面折射的影响的一些解决方案被提出。

简介：

简介：Thepile-soilsystemisregardedasavisco-elastichalf-spaceembeddedpile.Basedonthemethodofcontinuummechanics,anonlinearmathematicalmodelofpilesoilinteractionwasestablished-acouplingnonlinearboundaryvalueproblem.Underthecaseofhorizontalvibration,thenonlinearlydynamicalcharacteristicsofpileapplyingtheaxisforcewerestudiedinhorizontaldirectioninfrequencydomain.Theeffectsofparameters,especiallytheaxisforceonthestiffnesswerestudiedindetail.Thenumericalresultssuggestthatitispossiblethatthepileapplyinganaxisforcewillloseitsstability.So,theeffectoftheaxisforceonthepileisconsidered.

简介：Threetyphoons,Goni,MorakotandEtauwhichweregeneratedinWesternPacificin2009,aresuccessfullysimulatedbytheWRFmodel.Thehorizontalandverticalvorticityandtheirinteractionareanalyzedanddiagnosedbyusingthesimulationresults.Itisshownthattheirresultantvectorshadafixedpatternintheevolutionprocessofthethreetyphoons:Thehorizontalvorticityconvergedtothetropicalcyclone(TC)centerbelow900hPalevel,flowedoutfromitataround900to800hPa,andflowedinbetween800hPaand700hPa.Ifmultiplemaximumwindspeedcentersshowedup,thehorizontalvorticityconvergedtothecenterofthetyphoonbelowthemaximumwindspeedcenteranddivergedfromtheTCcenterabovethemaximumwindspeedcenter.Atlowlevels,thethreetyphoonsinteractedwitheachotherthroughverticalcirculationgeneratedbythevortextube.Thiscirculationwasmainlygeneratedbytheeastwardorwestwardhorizontalvorticityvectors.Cloudsandprecipitationweregeneratedontheascendingbranchoftheverticalcirculation.ThevortextubesoftenflowedtowardthesouthwestoftherightTCfromthenortheastoftheleftTC.Accordingtothefullvorticityequation,thehorizontalvorticityconvertedintotheverticalvorticitynearthemaximumwindspeedcenterbelow850hPalevel,andtheperiodofmostintenseconversionwasconsistentwiththeintensificationperiodofTC,whilethevorticityadvectionwasagainsttheintensification.Theverticalvorticityconvertedintothehorizontalvorticityfrom800hPato600hPa,andthewindspeeddecreasedabovethemaximumwindspeedregionatlowlevels.

简介：

简介：Inthispaper,usingHolland’smethod,theeffectofthehorizontalstructureoftropicalcyclonesontheirmotionisinvestigated.The"characteristicradius",r0characterizedasthehorizontalstructureofatropicalcyclone,inwhichmandparetheparametersofthevortex,hasbeenfoundbytheauthor.Andthenithasbeenshownthatthereisbutone"characteristicradius"foreachcyclonewithhorizontalstructure.Twodirectanalyticsolutionsfortheuniformandnon-uniformbasicflowsinsteadysituationsarepresentedwithrcResultsshowthatthechangeinthehorizontalstructureofthetropicalcycloneitselfwillhaveobviouseffectonthecyclonemotion,onbothitsdirectionandspeed.Thereforeitmustbeconsideredintheresearchonthetropicalcyclonemotion.

简介：Forintelligent/autonomoussubseavehicles,reliableshort-rangehorizontalpositioningisdifficulttoachieve,particularlyoverflatbottomtopography.Apotentialsolutionproposedinthispaperutilizedapassiveopticalsensingmethodtoestimatethevehicledisplacementusingthebottomsurfacetexture.Thesuggestedopticalflowmethoddoesnotrequireanyfeaturecorrespondencesinimagesanditisrobustinallowingbrightnesschangesbetweenimageframes.Fundamentally,thismethodissimilartocorrelationmethodsattemptingtomatchimagesandcomputethemotiondisparity.However,incorrelationmethods,searchinganeighborregionblindlyforbestmatchislengthy.Maincontributionsofthispapercomefromtheanalysisshowingthatopticalflowcomputationbasedonthegeneralmodelcannotavoiderrorsexceptfornullmotionalthoughthesignofopticalflowkeepscorrect,andfromthedevelopmentofaniterativeshiftingmethodbasedontheerrorcharacteristicstoaccuratelydeterminemotions.Advantagesoftheproposedmethodareverifiedbyrealimageexperiments.

简介：Amodelwasestablishedtopredictcondensationheattransfercoefficientonhorizontalrectangularfinnedtube.Drop-Offzoneatthetubebottomwasconsideredanddetermined,theknownHonda(andOwen)expressionofretentionanglewasalsomodifiedasaresultofconsideringdrop-offzone.Heatfluxonfintipsintheunfloodedregion,finflanks,finspacingsandfintipsinthefloodedregionwereanalyzedrespectively.COndensationonfintipsinemphasizedbyconsideringthevariationoffilmthicknessalongcircumferenceaswellashorizontally.FInefficiencywasconsideredincalculation.Thepredictionresultswerecomparedwithseveralresearchers'experimentaldataforthreekindsofworkingfluidsonsevendifferenttubegeometriesandforvarioustemperaturedifferences,Thesedataunderabout60testconditionswerepredictedwithdiscrepancyof±10%.PredictionbythepresentmodelforsteamandR-113condensationwerecomparedwithpreviousmodels.

简介：

简介：Thisarticlepresentsaspectralanalysisofwaveupliftloadsonahorizontaldeck.Thewaveupliftforcespectrumontheundersideofthedeckisobtained.Itisshownthatthewaveupliftforcespectraldensitydecreaseswiththeincreaseoftherelativeclearance1/3Δh/H.Theinfluencesofdifferentincidentwaveparameters,includingtherelativewaveheight1/3H/d,therelativedeckwidth/sBLandtherelativeclearance1/3Δh/Honthedimensionlesszerothspectralmomentoftheupliftforcesarediscussed.Itisfoundthatthezerothspectralmomentoftheupliftforcesincreaseswiththeincreaseoftherelativewaveheight1/3H/d,anddecreaseswiththeincreaseoftherelativeclearance1/3Δh/H.Anewdimensionlesspredictionmodelforthezerothspectralmomentofwaveupliftloadsonthedeckisproposedandtherelationshipbetweenthewaveupliftforcesandthezerothspectralmomentoftheupliftforceareobtained.

简介：Convectioninahorizontalfluidlayerheatedfrombelowisoneofmodelsforstudyingpatternsofconvectioninbinaryfluidmixturesandhasbeenextensivelystudied.Inthisarticle,theconvectionstructuresinarectangularcellwereinvestigatedfortheaspect-ratioΓ=12andtheseparationratioψ=-0.47.SimulationswerepreformedbysolvingthehydrodynamicequationsusingtheSIMPLEmethod.ACounterPropagatingWave(CPW)statewasfoundinbinaryfluidconvectionwithaperiodicallyhorizontalmotionofdefects,andthepatterndynamicswasfurtherdiscuss.

简介：一个数字模型为由一个改进不可压缩的弄平的粒子在一个水平甲板上模仿波浪影响被建立水动力学(ISPH)。作为一个格子更少粒子方法，ISPH方法广泛地与好精确性在免费表面的水动力学流动被使用了。改进在基于粒子的计算和一个新评价方法为尖动量保存的改进包括校正功能的雇用在水平甲板上预言压力。模拟结果与实验显示出一个好协议。现在的数字模型能被用来在水平甲板上学习波浪影响负担。

简介：

简介：Thetechniqueoncomputingthehorizontalpressuregradientforce(PGF)inRegCM2isimprovedwiththeerrorsubtractionmethod.Moreover,theregionalclimateinJuneof1991inChinaissimulatedbyemployingtheRegCM2.ComparisonwithotherschemesforcomputingthePGFshowsthattheerrorsubtractionmethodcaneffectivelyreducetheerrorofthePGF,improvethesimulationofwindsandalleviatethespuriousprecipitationinsteeptopographicareas.Furthermore,thesimulationofprecipitationinotherareasisinbetteraccordancewiththeobservation.

简介：稠密阶段的灵魂在水平管道在4.0MPa的一个压力下面传送研磨的煤的气体/固体的流动政体在直径的10公里，被电的电容断层摄影术(ECT)用8个电极监视。改进电容测量的精确性，测量电路的一个基于交流的单个隧道的电容被开发，并且一个修改反复的Landweber算法被用来重建图象。一个二液体的模型基于小粒的流动的运动理论被用来学习稠密阶段的灵魂传送研磨的煤的三维的不变的流动行为。

简介：为模仿air-to-refrigerantfin-and-tube蒸发器的稳定的州的行为的一个一般、简单的模型在试管内与详细流动模式的焦点被介绍。为了模仿热，在空气和工作液体之间转，蒸发器被划分成很多控�

简介：Thebesthydraulicchannelsectionmakesthemaximumflowcapacityforthesameflowcross-area,andtheminimumcross-areaandwettedperimeterforthesamedischarge.Theconstructioncostcanbereducednearlytotheminimumatthesametime.Thehorizontalbottomparabolicsection(HBPsection)isacompositesection.Itisimportantfordesigntofindthebestcombinationformofthehorizontalbottomandtheparabolicsides.Thispaperstudiesthebesthydraulicsectionanditshydrauliccharacteristics.Theexplicitformulaeareproposedtodeterminethedimensionsandthebestcombinationformofthehorizontalbottomandtheparabolicsides.Theseexplicitformulaeandtheparametersmakeiteasytodesignthechannel.Itisshownthattheratiosofthesurfacewidthtothedepthandthebottomwidthtothedepthareconstantforthebesthydraulicsection.Thecomparisonswiththeclassicparabolic,rectangular,trapezoid,triangular,semi-cubicandhorizontal-bottomedsemi-cubicsectionsshowthattheHBPsectionhasthelargestflowcapacityandtheshortestwettedperimeterforthesameflowarea,andhasthesmallestflowareaforthesamedischarge.ItisindicatedthattheparabolicsidepartsofthebesthydraulicHBPsectionaredifferentfromthoseoftheclassicsection.TheresultsofthebesthydraulicsectionoftheclassicparabolicchannelcannotbeapplieddirectlytotheHBCsection.