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Achieving convergence in model with porouse medium

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Old   August 19, 2003, 07:12
Default Achieving convergence in model with porouse medium
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mneo
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I have troubles with achieving convergence during computations what can I do? regards
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Old   August 19, 2003, 07:56
Default Re: Achieving convergence in model with porouse me
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ap
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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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Old   August 19, 2003, 08:14
Default Re: Achieving convergence in model with porouse me
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mneo
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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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Old   August 20, 2003, 05:44
Default Re: Achieving convergence in model with porouse me
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jieremy
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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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Old   August 20, 2003, 06:19
Default Re: Achieving convergence in model with porouse me
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mneo
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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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Old   August 20, 2003, 08:36
Default Re: Achieving convergence in model with porouse me
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ap
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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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