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Interpretation of convergence plots in CFX

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Old   August 24, 2011, 20:39
Default Interpretation of convergence plots in CFX
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James McLachlan
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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?
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Old   September 2, 2011, 13:17
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Mark Troscinski
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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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Old   September 5, 2011, 14:03
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Joshua Counsil
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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:
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cfx, convergence issues

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