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July 8, 2009, 15:46 |
Eulerian Modeling: Frictional Viscosity Help
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#1 |
Member
Casey
Join Date: Jun 2009
Posts: 98
Rep Power: 17 |
Dear All,
I tried to make a UDF to mimic the frictional viscosity (Schaeffer) coded inside of fluent, but I was not able to do it. I know fluent sets a limit of 10^5 for the frictional viscosity, but I dont know how fluent deals with the frictional viscosity when the deviatoric strain rate is zero (since this is in the denominator or the frictional viscosity). I am simulating a bed of particles interacting with a jet of gas, so initially the particles aren't moving and I am having trouble with my UDF finding a way to properly limit the frictional viscosity. I tried using something where if deviatoric strain < 10^-12 then frictional viscosity = (Pf*sin(phi))/(solidsvof*10^-12). However, when I did this I still could not repeat the simulation results had found. Even with a higher limit on the frictional viscosity, the bed in my case was more liquid like than the fluent case. Can anyone help? I have been banging my head against this problem for weeks. Let me know if you need more information. Thanks, casey |
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January 25, 2018, 16:13 |
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#2 |
New Member
Join Date: May 2015
Posts: 9
Rep Power: 11 |
Hi, did you eventually solve your problem? BR, Alex
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