# Achieving convergence in model with porouse medium

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 August 19, 2003, 06:12 Achieving convergence in model with porouse medium #1 mneo Guest   Posts: n/a I have troubles with achieving convergence during computations what can I do? regards

 August 19, 2003, 06:56 Re: Achieving convergence in model with porouse me #2 ap Guest   Posts: n/a 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

 August 19, 2003, 07:14 Re: Achieving convergence in model with porouse me #3 mneo Guest   Posts: n/a 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

 August 20, 2003, 04:44 Re: Achieving convergence in model with porouse me #4 jieremy Guest   Posts: n/a 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.

 August 20, 2003, 05:19 Re: Achieving convergence in model with porouse me #5 mneo Guest   Posts: n/a 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

 August 20, 2003, 07:36 Re: Achieving convergence in model with porouse me #6 ap Guest   Posts: n/a If the problem is the reduction of k-eps residuals, try to reduce their under-relaxation factors to 0.4.

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