# Refinement criteria

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 August 30, 2003, 05:49 Refinement criteria #1 Julie Polyakh Guest   Posts: n/a How do I choose the refinement criteria and the value of per cent of cells being refined?

 August 30, 2003, 08:32 Re: Refinement criteria #2 allan Guest   Posts: n/a experience. Are you refining because you have a converged solution and you want better resolution, or it is not converged? allan

 August 30, 2003, 09:11 Re: Refinement criteria #3 Julie Polyakh Guest   Posts: n/a I need to perform a grid-independence check.

 September 1, 2003, 14:49 Re: Refinement criteria #4 allan Guest   Posts: n/a well! double the number of cells in each direction then allan

 September 1, 2003, 15:45 Re: Refinement criteria #5 Joern Beilke Guest   Posts: n/a ... but even a converged and grid independend solution might be completely wrong. You should look for the correct solution

 September 2, 2003, 04:57 Re: Refinement criteria #6 Thomas Guest   Posts: n/a search for Richardson extrapolation. It is quite old stuff (around 1920, I guess) but it is a mathematical procedure to obtain a grid independent solution. you have to start with a coarse mesh and then refine it twice by facor 2 in each dimension (2x2x2 for 3D case). then you to put the results (pressure drop, temperature increase/decrease or whatever into an equation and you will get the so called grid-independent solution. but keep in mind: this does not mean, you get the 'right' solution! thomas

 September 2, 2003, 10:28 Re: Refinement criteria #7 Ulf Guest   Posts: n/a This is a respond to Joern and Thomas. If you have a grid-independend solution, you will THE solution for the problem that you have specified.

 September 2, 2003, 15:07 Re: Refinement criteria #8 Joern Beilke Guest   Posts: n/a You probably have the solution for the mathematical problem you have specified but not for the psysical problem which you want to solve.

 September 2, 2003, 23:41 Re: Refinement criteria #9 Ulf Guest   Posts: n/a Yes, I agree with you. But this was not the question in the first place...

 January 6, 2004, 09:51 Re: Refinement criteria #10 khelil ali Guest   Posts: n/a BONJOUR il faut rafiner le maillage au niveau des parois et dans les zones de grandes perturbation "zones de recirculation et à l'entrée.

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