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Results getting worse with higher Convergence |
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August 9, 2010, 01:36 |
Results getting worse with higher Convergence
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#1 |
New Member
abhay
Join Date: Aug 2010
Posts: 9
Rep Power: 15 |
Hi ,
Am a new member to this site. I am facing a problem when running iterations on fluent. In my problem, i expect a symmetric result but when i decrease the convergence limit from e-3 to e-4 the results becomes asymmetric which i know is not correct. Is it possible that in some cases result may get worsen when decreasing the convergence limit? Please help. |
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August 9, 2010, 02:32 |
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#2 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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maybe is your calculation not converged. Let iterate.
But if you are expecting a symmetric result, why don't you use symmetry?
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In memory of my friend Hervé: CFD engineer & freerider |
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August 9, 2010, 02:53 |
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#3 |
New Member
abhay
Join Date: Aug 2010
Posts: 9
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thanks Max for the reply am not using symmetry because i want to test as to what grid size and convergence criterion can give right results, if it comes sym, i can rest assured that result id crct. please elaborate upon first part of ur reply. Thanks
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August 9, 2010, 04:02 |
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#4 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 |
if your interest is a force or massflow or whatever, I would monitor this variable in function of iterations (solve/monitor/surface)
It will give you an idea if you get a converged solution or not. (residuals charts aren't sufficent)
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In memory of my friend Hervé: CFD engineer & freerider |
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convergence, fluent |
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