multiphaseEulerFoam壁面粘附问题求助
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最近想做一个液固输送,颗粒较多,并且固体颗粒会粘附在壁面上生长。尝试了很多方法,但是都不太理想,固体颗粒总是跑掉,无法在壁面附近聚集,体积分数最多1e-5。
已经设置了壁面类型:FoamFile { version 2.0; format ascii; class volVectorField; object U.particles; } dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); WALL { type JohnsonJacksonParticleSlip; restitutionCoefficient 0.8; specularityCoefficient 0.00001; muF 0.7; sigma 2; value uniform (0 0 0); }
颗粒间的作用设置如下:
FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object turbulenceProperties.particles; } simulationType RAS; RAS { model kineticTheory; turbulence on; printCoeffs on; kineticTheoryCoeffs { equilibrium off; continuousPhase liquid; e 0; alphaMax 0.63; alphaMinFriction 0.5; residualAlpha 1e-4; viscosityModel Gidaspow; conductivityModel Gidaspow; granularPressureModel Lun;/ frictionalStressModel JohnsonJacksonSchaeffer; radialModel SinclairJackson; JohnsonJacksonSchaefferCoeffs { Fr 0.05; eta 2; p 5; phi 28.5; alphaDeltaMin 0.05; } }
在thermophysicalProperties中的颗粒相粘度比较小1e-6量级。
同时在运行中,能看到总的体积分数Phase-sum volume fraction, min, max = 1.00007496 0.988884069 1.16288542
最大值超过1的情况,虽然没有发散,但是超过的有点多,很不合理,不知道什么原因。
先在这里感谢各位老师指教,谢谢!