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August 24, 2011, 21:39 |
Interpretation of convergence plots in CFX
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#1 |
New Member
James McLachlan
Join Date: May 2011
Posts: 6
Rep Power: 15 |
Hi all
I am currently developing a cfd simulation of a shower mixer in CFX, and am having some problems with attaining a decent convergence. I understand that possible faults in the model can be found by analysing features within the convergence plots (eg large oscillations), is there a reference that anyone can point me to that explains these features, and what they say about the model? Thanks, James |
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September 2, 2011, 14:17 |
Research Specialist
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#2 |
New Member
Mark Troscinski
Join Date: Jan 2010
Location: McMurray, PA
Posts: 1
Rep Power: 0 |
If your steady-state residuals exhibit large oscillations, it's quite likely your physical flow is inherently time-varying. I suggest running the application as a transient solution, saving some .trn files along the way, and then check to see if the convergence behavior improves within each time step. If so, create a transient animation to find the location of the unsteadiness.
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September 5, 2011, 15:03 |
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#3 |
Senior Member
Joshua Counsil
Join Date: Jul 2009
Location: Halifax, Nova Scotia, Canada
Posts: 366
Rep Power: 18 |
Hey James,
Think about it logically. Look at the locations of maximum residuals - is something physically important happening there, or is the mesh quality/resolution poor? You may also find inspiration in an introductory CFD book or this page: http://www.cfd-online.com/Wiki/Ansys_FAQ#Postprocessing |
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