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Achieving convergence in model with porouse medium |
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August 19, 2003, 07:12 |
Achieving convergence in model with porouse medium
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#1 |
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I have troubles with achieving convergence during computations what can I do? regards
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August 19, 2003, 07:56 |
Re: Achieving convergence in model with porouse me
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#2 |
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You can do many things to improve convergence. These are some general guidelines:
1) Use a good quality mesh. 2) If you're using a high order discretization scheme, try starting with the first order scheme, then switch to the higher one. 3) Reduce under-relaxation factors. 4) Change solver parameters (sweeps,...). What model are you using? What discretization scheme? And what residuals don't reduce? Hi ap |
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August 19, 2003, 08:14 |
Re: Achieving convergence in model with porouse me
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#3 |
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I use: steady and k-e model first order scheme under-relaxation factors: preasure-0,2 momentum-0,5 k,e-0,6 mesh type-hexa
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August 20, 2003, 05:44 |
Re: Achieving convergence in model with porouse me
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#4 |
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And you can also conpute innitially using a simple Model.When u have got a initial value then u can change your model.I always do it and it works well.
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August 20, 2003, 06:19 |
Re: Achieving convergence in model with porouse me
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#5 |
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My problem is flow through perforated plate with 45% open.I start computations without turning on "porous zone" and "laminar zone" in Fluid panel in boundary conditions and I achieved convergence. With turned on "laminar zone" I achieved convergence too but I dont't know it's right. Any suggestions? regards
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August 20, 2003, 08:36 |
Re: Achieving convergence in model with porouse me
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#6 |
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If the problem is the reduction of k-eps residuals, try to reduce their under-relaxation factors to 0.4.
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