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-   -   Max residuals are far from poor quality cells (http://www.cfd-online.com/Forums/cfx/22409-max-residuals-far-poor-quality-cells.html)

Steven April 6, 2006 07:40

Max residuals are far from poor quality cells
 
Hello to everyone!

I have a hardly conveging task. Suspect cell with low internal angle. I cannot fully avoid them, but their number is negligible among perfect other cells. Remarkably, the regions of maximum residuals are at a long distance from those poor-quality cells.

QUESTION: May I therefore conclude those cells are NOT the reason of my difficult covergence?

Thank you.

Glenn Horrocks April 6, 2006 19:00

Re: Max residuals are far from poor quality cells
 
Hi,

Check that the region of maximum residual is not simply convected from the region of poor mesh quality, but if not then yes, your conclusion sounds reasonable.

regards, Glenn

Steven April 6, 2006 21:58

Re: Max residuals are far from poor quality cells
 
Yes, Glenn, I did checked and re-checked it: the regions are 3D-space-separated; only one small piece of residual isosurface is located near (upstream) to the low-angle one, but is not overlapping and its shape is different from the low-angle isosurface piece.

Furthemore, the largest piece of (the highest) residual isosurface is located in the (central) area, where the grid if ~0.7-times finer than that in other areas.

Thank you for your help and very best regards.

Steven


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