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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Comsol runs very slow

Posted Nov 13, 2013, 10:20 p.m. EST Studies & Solvers Version 4.3a, Version 4.3b 5 Replies

Lalitha Saravanan
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Hi there,

Am doing a simple Fluid flow analysis, where i change only the flow rates for the same geometry. The simulation was running fine and I get results in a few minutes.

Since last two days, the experiment is running very slow and sometimes it gets stucked up and not progressing.

Could someone help pls..

Tks.
5 Replies Last Post Nov 15, 2013, 3:08 a.m. EST
Vasanthan Devaraj
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Posted: 1 decade ago Nov 14, 2013, 12:50 a.m. EST
Did you changed the mesh ?? Incase it may take long time!!
Did you changed the mesh ?? Incase it may take long time!!
Lalitha Saravanan
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Posted: 1 decade ago Nov 14, 2013, 3:06 a.m. EST
Hi,

No, I dont change the mesh also. Just the flow rate, which i reduced to a smaller value.
Please help me if you have any idea.

tks
Hi, No, I dont change the mesh also. Just the flow rate, which i reduced to a smaller value. Please help me if you have any idea. tks
Julien Givernaud
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Posted: 1 decade ago Nov 14, 2013, 8:32 a.m. EST
I have also some problems with solver rate
I have observe that time dependent solver can slow down and becoming very slow!
The progress rate of the solver stay fixe at a certain value, at the beginning of the calculation there is no this kind of effect. (I don't talk about the value of the convergence time step).
What happens?

Julien
I have also some problems with solver rate I have observe that time dependent solver can slow down and becoming very slow! The progress rate of the solver stay fixe at a certain value, at the beginning of the calculation there is no this kind of effect. (I don't talk about the value of the convergence time step). What happens? Julien
Nancy
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Posted: 1 decade ago Nov 14, 2013, 12:21 p.m. EST
Hi,
Have you tried clearing the previous solutions before running the program? This might help.
Nancy
Hi, Have you tried clearing the previous solutions before running the program? This might help. Nancy
Julien Givernaud
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Posted: 1 decade ago Nov 15, 2013, 3:08 a.m. EST
Thank you Nancy,

I have found the solution. I use now PARDISO solver instead MUMPS wich as allocation memory problem
and slow down computation

Julien
Thank you Nancy, I have found the solution. I use now PARDISO solver instead MUMPS wich as allocation memory problem and slow down computation Julien

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