# kira

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## Color by count...

Posted November 1, 2012 at 08:50 by kira

ICEM: explaining why you might see multiple curves in same location.

Quote:
Originally Posted by PSYMN
For the curves, turn on color by count... If you see yellow curves between two surfaces, then they are each single edge curves and you probably have two... Build topology will remove the duplicate if your tolerance is sufficient. This will also change the curve color by count to red, meaning a single curve is between those surfaces.

As for deleting curves, it really just makes them dormant. When you
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## under-relaxation factors -> level of residuals

Posted August 27, 2012 at 09:27 by kira

more helpful info on under-relaxation factors:

Quote:
Originally Posted by LuckyTran
No magic here, that's what's supposed to happen. Unless your solution is diverging, do not bother with the under-relaxation factors. If it is diverging, do as you did, lower the factors until you can a stable solution, and then raise them again if possible. If not, then it is a hint that there is an inherent stability issues in the problem you are trying to solve or perhaps one of your modeling parameters is incorrect.

All
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## what is under relaxation factor?

Posted August 27, 2012 at 09:23 by kira

something to keep in mind:
Quote:
Originally Posted by Phil
;140717
Each of the variables(mass,mom,density) represents an equation the solver is trying to solve. Each iteration the values obtained for the variables should get closer and closer together - converge. FOR SIMPLE PROBLEMS ESPECIALLY COLD FLOWS WITHOUT COMBUSTION YOU SHOULD SIMPLY KEEP THE RELAXATION FACTORS AT DEFAULT.

Sometimes for many many reasons the solution can become unstable so a relaxation factor is used - takes part of value from previous iteration
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