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Euler Granular Model unstable granular pressure |
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Werner
Join Date: Apr 2014
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I have the following problem.
I modified the tutorial case of the twoPhaseEulerFoam out of openfoam extend 3.1 to simulate a packed bed. Now i have the problem, that also after a check of the fvSolutions there is a very instable granular pressure distribution. Because of this instabilities there is a bed movement in a way that it became very flat. The problem starts when the granular reaches the walls. For the simulation i use the following kineticTheory setup. But a study of different models shows that the problem sould be mostly independent from these settings. | ========= | | | \\ / F ield | foam-extend: Open Source CFD | | \\ / O peration | Version: 3.1 | | \\ / A nd | Web: http://www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object kineticTheoryProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // kineticTheory on; equilibrium on; e e [ 0 0 0 0 0 0 0 ] 0.8 ; alphaMax alphaMax [ 0 0 0 0 0 0 0 ] 0.62 ; alphaMinFriction alphaMinFriction [ 0 0 0 0 0 0 0 ] 0.4 ; Fr Fr [ 1 -1 -2 0 0 0 0 ] 0.05 ; eta eta [ 0 0 0 0 0 0 0 ] 2.0 ; p p [ 0 0 0 0 0 0 0 ] 5.0 ; phi phi [ 0 0 0 0 0 0 0 ] 45 ; viscosityModel HrenyaSinclair;//Syamlal;//Gidaspow; conductivityModel HrenyaSinclair;//Syamlal;//Gidaspow; granularPressureModel SyamlalRogersOBrien; //Lun frictionalStressModel JohnsonJackson; radialModel LunSavage;//Gidaspow; HrenyaSinclairCoeffs { L L [ 0 1 0 0 0 0 0 ] 5.0e-4 ; } // ************************************************** *********************** // It would be very happy about a input or a suggestion for my problem. |
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euler euler solid-gas, granular pressure, kinetic granular theory, kinetic theory |
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