第2425集流固耦合的理論與計算上甲丙dxf建立三維潛水面

|（E）Section24-25：Principleandcalculationoffluid-solidcouplingDXFfileforestablishingadivingsurfacein?：都 水粒氣水粒氣principleprincipleofeffectivePorewater

EffectiveEffectiveBiot系數(shù)定義為當(dāng)孔隙Biot系數(shù)定義為當(dāng)孔隙BiotBiotprincipleofeffective

PorewaterEffectiveEffectivewaterpressure

modelconfigurefluidmodelfluidactiveon

neor學(xué) 回路

環(huán) 環(huán)路In的區(qū)域用流體的null材料定義（與Null本構(gòu)模型區(qū)別）。In的區(qū)域用流體的null材料定義（與Null本構(gòu)模型區(qū)別）。GridNotConfiguredforFluid沒有打開沒有打開Modelconfigurefluid或者：modelfluidactive

zonezonegridpointinitializepore-pressureS0gradient（Gz*z）rangeposition-Z-orwiththezonewater ne(orzonewatersetcommand.此時必須設(shè)置流體密度zonewaterdensity與重力值modelgravity。打開Modelconfigurefluid或者：modelfluidactive打開Modelconfigurefluid或者：modelfluidactive

配流體模型zonefluidcmodelassignisotropic/anisotropicrange….其中若想設(shè)置隔水邊界模型，用zonefluidcmodelassignnullrange…（注意與null本構(gòu)模型的區(qū)別） Zonewater命令(orzonegridpointZonewater命令(orzonegridpointinitializepore-pressure) 如果FLAC3D打開滲流計算板塊(即設(shè)置了modelconfigurefluid),則固體飽和密度設(shè)置：zoneinitializedensityf固體干密度設(shè)置：zonePropertydensity流體密度設(shè)置（全局設(shè)置）：zonewater流體密度范圍設(shè)置：zoneinitializefluid-densityBiotCoefficient&Biot

Tip:BiotTip:Biot系數(shù)是zone屬性，見Page10；用zonefluidpropertybiotfbiot模量是節(jié)點變量，由zonegridpointinitializefluid-moduluszonefluidbioton 量導(dǎo)致更快的收斂速度。無論如何，從數(shù)值計算的觀點，沒有必要大于20倍的土體的體積模量。zonefluidpropertyporosityfrangezonezonegridpointinitializesaturationfrange...

細(xì)粒土中，孔隙水可以承受明顯的拉力（負(fù)超孔隙水壓力）。在FLAC3D中，流出，土體不再飽和）。負(fù)超孔隙水壓的極限用INITIALftens命令設(shè)置，程 zonegridpointinitializefluid-tensionfrange...fluid-modulus使用：zone pore-pressurerange…進行設(shè)孔隙水壓力固定（Pore-pressurefixed）：這是一個可滲透邊界，沿著使用：zonegridpointfixpore-pressurefrangepore-pressure固定。或者，用zonefaceapplypore-pressure命令設(shè)置外部或者內(nèi)部的邊界條件。需 ，如果不是設(shè)定外邊界面上的孔隙水壓力，必須用interior 。用zonefaceapply命令的一個好處就是：可以用history控制孔隙水壓力（使用fish功能）。zonezonegridpointfixwell將規(guī)定的流入或流出應(yīng)用于邊界網(wǎng)格點。如果添加modelmodelconfigurefluid;modelmodelconfigurefluid;geometry--zonecreatecylindersize201010point1(020)point2(001)point3(20;fluidflowmodel--zonefluidcmodelassignzonefluidpropertypermeability0.5e-4porosity0.5biot1zonefluidbiotonzonegridpointinitializebiot;iffluidmodulusis;setflbiot;inifmoduluszoneinitializefluid-densityzonegridpointinitializefluid-tension;initialconditions--modelrangecreate'mound'cylinderend-100-1end-2002radius1.01zonegridpointinitializesaturation0.0zonegridpointinitializesaturation1.0rangenamed-rangemoundzonegridpointinitializepore-pressure1e4grad00-1e4...rangenamed-range;settingsmodelgravity00-10modelmechanicalactiveoffmodelfluidactiveonmodelsave;test--modelsolvefluidtime-totalmodeltitle"Spreadingofagroundwatermound(t=0.35)"modelsave'mound1'modelsolvefluidtime-totalmodeltitle"Spreadingofagroundwatermound(t=modelsavemodelsolvefluidtime-totalmodeltitle"Spreadingofagroundwatermound(t=0.65)"modelsave'mound3'modelsolvefluidtime-totalmodeltitle"Spreadingofagroundwatermound(t=0.85)"modelsave'mound4'modelmodelmodelconfigurefluidzonecreatebricksize40120point0000point12000point2010point300;mechanicalmodel--zonepropertybulk5e7shear3e7fric25cohesion1e5tens1e10zonegridpointfixvelocity-xrangeunionposition-x0position-x20zonegridpointfixvelocity-y;applyloadslowlyfishdefinerampzonefaceapplystress-normal=-0.3e6fish@ramp...rangeposition-x03position-z10;fluidflowmodel--;porepressurefixedatzeroatthesur