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Delimit maximum and minimum values
Posted 19.07.2010, 12:14 GMT-4 1 Reply
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Hello!!
Is there a way to delimit the maximum and minimum values for a specific variable? For instance, when I use the MS application mode I often get mass fraction values over 1 and below 0 if I don't use a very refined mesh. Could I say Comsol to take 1 if w>1 and to take 0 if w<0?
Thank you very much!!!
Is there a way to delimit the maximum and minimum values for a specific variable? For instance, when I use the MS application mode I often get mass fraction values over 1 and below 0 if I don't use a very refined mesh. Could I say Comsol to take 1 if w>1 and to take 0 if w<0?
Thank you very much!!!
1 Reply Last Post 21.07.2010, 04:00 GMT-4
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Posted:
1 decade ago
Hi
from my understanding there is nothing blocking you from using bolean conditions, or "if()" statements in most expression fields in COMSOL.
There is though an element to consider: COMSOL often uses the derivative of variables, which it creates via different methods depending on your input, and bolean opeators are not the easiest to derive. Smoothing the limits with Heavyside step functions or similar behaviour could help if one hit some convergion issues when solving
--
Good luck
Ivar
from my understanding there is nothing blocking you from using bolean conditions, or "if()" statements in most expression fields in COMSOL.
There is though an element to consider: COMSOL often uses the derivative of variables, which it creates via different methods depending on your input, and bolean opeators are not the easiest to derive. Smoothing the limits with Heavyside step functions or similar behaviour could help if one hit some convergion issues when solving
--
Good luck
Ivar