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V4 RF What increases computing time?

Posted 17 ott 2010, 13:36 GMT-4 1 Reply

Irfan
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hi,

Does the it the physical size of the model or the electrical size that causes increase in computing time excessively, though no memory error comes.

So I need to know where to focus on physical or electrical size for reduced computing time?

Thanks

Irfan
1 Reply Last Post 18 ott 2010, 02:04 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 18 ott 2010, 02:04 GMT-4
Hi

there are many issues: first certainly the number of DoF (degrees of freedom) mainly related to the meshing density or the volume. To improve, try reducing from 3D to 2D and use symmetry.

Then you have non linear effects that makes the sovler iterate a lot, try starting in linear mode (check your varables, do you need material non linearities etc

further you have time stepping if you are in transient, do you really need all those intermediate times ? are there weays to analyse the system over a shorter time period ...

Can you use a modal approach instead of transient etc

--
Good luck
Ivar
Hi there are many issues: first certainly the number of DoF (degrees of freedom) mainly related to the meshing density or the volume. To improve, try reducing from 3D to 2D and use symmetry. Then you have non linear effects that makes the sovler iterate a lot, try starting in linear mode (check your varables, do you need material non linearities etc further you have time stepping if you are in transient, do you really need all those intermediate times ? are there weays to analyse the system over a shorter time period ... Can you use a modal approach instead of transient etc -- Good luck Ivar

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