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April 17, 2015, 14:06 |
simpleFoam diverges
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#1 |
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Hi there,
I'm modelling 2d axisymmetric turbulence flow in a channel. Solution is converged when I use kOmegaSSTF model but no matter what i do, I can't get converge with kOmegaSST or kEpsilon RNG models. I tried changing the solver to pisoFoam or pimpleFoam or decreasing under relaxations, but sill no answer. I would appreciate any help. Thanks in advance.
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April 18, 2015, 04:45 |
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#2 |
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ali alkebsi
Join Date: Jan 2012
Location: Strasbourg, France
Posts: 82
Rep Power: 14 |
case, mesh, boundary conditions, and turbulence parameters?
when, how does divergence start? |
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April 20, 2015, 08:13 |
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#3 | |
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Join Date: Apr 2015
Location: EU
Posts: 38
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Quote:
Did you setup the BC correctly? Are you using wall functions? What is your y+? What did you use for initial conditions? Is your simulation steady? I find it very strange that kOmegaSST doesn't converge in a simply channel/pipe flow. Hope it helps |
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April 21, 2015, 01:14 |
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#4 |
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Thanks for reply and sorry for delay.
Case seems well because i could get convergence for 3d and 2d kOmegaSSTF. BTW this is my boundary conditions: (i can share 0-folder files if it's necessary) U: profile1DfixedValue for inlet, (this boundary is used for cylindrical cases) profile1DfixedValue for outlet, fixedValue for walls zeroGradinet for outlet wedge for frontAndBack (symmetry faces) also for k, I had experimental data. with kOmegaSSTF this is residuals: and for kOmegaSST: Flow is in axial and radial directions in inlet so i think axsymmetric assumption is right...isn't it? Also for boundary condition of U and k, i had put a probe in inlet and checked them with experimental data which exactly fit. I haven't checked y+ yet, but due to good results of U profile of kOmegaSSTF i think that is not a matter...BTW i will check it. Simulation is steady.
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