Planar Motion Mechanism

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1、PlanarMotionMechanismTutorialSeoulOffice,CD-adapcoGroupIntroduction•Objective–Simulate„PMM‟usingSTAR-CCM+•Outline–Importgeometry–Meshsettings–Physicssettings–Boundaryconditions–Motionsettings–Reporting–RunSeoulOffice,CD-adapcoGroupImportGeometry•Startanewsimulation•Importsurfacegeometry“KCS.dbs“t

2、oregionSeoulOffice,CD-adapcoGroupGeometricalInformationScaleratio40Draft0.270mLCG,KG-0.085m,0.359mForward1.952m/svelocity(U0)Sway0.4461rad/s(0.071Hz)frequency(ω)Sway+/-1mamplitude(Y0)Yawamplitude(ψ0)12.95degSeoulOffice,CD-adapcoGroupMeshContinuum•Continua>Mesh1•Selectmeshingmodels–Surfaceremesher

3、–Trimmer–PrismlayermesherSeoulOffice,CD-adapcoGroupMeshSettings•Setreferencevalues–Basesize=0.3–Maximumcellsize=400%–Numberofprismlayers=6–Prismlayerstretching=1.3–Prismlayerthickness=0.0075m–SurfaceCurvature=60(Pts/circle)–Surfacesize»Relativeminimumsize=25%»Relativetargetsize=400%–Templategrowt

4、hrate»Defaultgrowthrate=slow»Boundarygrowthrate=slowSeoulOffice,CD-adapcoGroupMeshSettings•Runa“MACRO.java”togeneratevolumeshapesaroundship•AutomaticallysetvolumetriccontrolsSeoulOffice,CD-adapcoGroupPhysicsSettings•Createnewphysicscontinuum•Selectphysicsmodels–Threedimensional–Implicitunsteady–M

5、ultiphasemixture–Volumeoffluid–Turbulent–K-Epsilonturbulence–Gravity–VOFwavesSeoulOffice,CD-adapcoGroupPhysicsSettings•Createeulerianphases–Createnewphase–Phasename=water–Selectmodels»Liquid»Constantdensity–Createalso„air‟phase»Name=air»models=gas,constantdensity•Selectgradientmethod“Green-Gauss”

6、SeoulOffice,CD-adapcoGroupPhysicsSettings•Create“FlatVOFWave”•SetwavepropertiesSeoulOffice,CD-adapcoGroupPhysicsSettings•Setinitialconditions–Changethemethodofpressureto“FieldFunction”–Selectscalarfunction“HydrostaticPressureofFlatVofWave1”–Alsosetafieldfunctiononotherproperties»Velocity=Velocity

7、ofFlatVofWave1»VolumeFraction(composite)-Water=VolumeFractionofHeavyFluidFlatVofWave1-Air=VolumeFractionofLightFluidFlatVofWave1SeoulOffice,CD-adapcoGroupBoundaryConditions•SetmeshconditionsofboundarySeoulOffice,CD-ada