CFD Online Discussion Forums

CFD Online Discussion Forums (
-   CFX (
-   -   [CFD-Post] Viewing max residuals (

siw July 26, 2012 04:50

[CFD-Post] Viewing max residuals

Is it possible to view in CFD-Post where the maximum residual (as plotted by the CFD-solver during a simulation) is in a fluid domain? I've tried Isosurface, Contours, Function calculator but cannot find where to get the max residual locations.

If I can where it is occuring then I can improve the mesh in that area to improve the RMS residuals and convergence - even though I'm getting a constant residual and monitor point values the RMS residual valve needs to go down by another order of magnitude.


Lance July 26, 2012 05:16

You can get the residuals in post if you have checked the "output equation residuals" in pre (under output control). Then they will show up in the variables list in post.

siw July 26, 2012 05:59

Thanks Lance.

I must have missed it in Output Control when I set up my monitor points.

However, I don't see any mention of residuals in the Variables list (even expanded all the lists in Variables). Have I done something wrong or am I looking in the wrong place (even though I think I've run out of place to look)?

Lance July 26, 2012 09:29

They should be in the variables list, named something like P.Mass Residual, etc.

After the "output eqn residuals" check box, did you change "Eqn. Residuals" to "All" from "None"?
If you run transient you'll need to check the "output eqn residuals" box under trn results as well to get the residuals in the trn files and not only in the .res file.

error404 May 21, 2014 07:32

You can visualize the max. or min. residuals with a "point".

Then you can refine your mesh at this location.

All times are GMT -4. The time now is 05:56.