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why COMSOL is solving so slowly

Posted Sep 2, 2013, 11:03 p.m. EDT Heat Transfer & Phase Change, Studies & Solvers Version 4.3b 5 Replies

Jiuan Wei
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Hi All,

I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I use the segragated solver.

And I found that: the time for assembly in each step is around 15 minutes, and memory usage seems OK, around 8GB.

I wonder whether this calculation speed is normal or not.

Thanks.
5 Replies Last Post Sep 6, 2013, 2:54 a.m. EDT
Lasse Murtomäki
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Posted: 1 decade ago Sep 3, 2013, 1:50 a.m. EDT
It does not sound normal, neither the use of 8GB of memory. Are you solving a steady-state or a time-dependent problem?
It does not sound normal, neither the use of 8GB of memory. Are you solving a steady-state or a time-dependent problem?
Jiuan Wei
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Posted: 1 decade ago Sep 3, 2013, 10:22 p.m. EDT
Hi Lasse, it is a steady-state case.
Hi Lasse, it is a steady-state case.
Lasse Murtomäki
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Posted: 1 decade ago Sep 4, 2013, 3:03 a.m. EDT

Hi Lasse, it is a steady-state case.


What kind of hardware you have?
[QUOTE] Hi Lasse, it is a steady-state case. [/QUOTE] What kind of hardware you have?
Jiuan Wei
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Posted: 1 decade ago Sep 5, 2013, 11:31 p.m. EDT
I am using a Dell workstation with 48GB memory.
I am using a Dell workstation with 48GB memory.
Lasse Murtomäki
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Posted: 1 decade ago Sep 6, 2013, 2:54 a.m. EDT

I am using a Dell workstation with 48GB memory.


OK, you must have a problem in the model, I presume. I am not working myself on this topic, but try to find out a same kind model, and solve that for comparison.
[QUOTE] I am using a Dell workstation with 48GB memory. [/QUOTE] OK, you must have a problem in the model, I presume. I am not working myself on this topic, but try to find out a same kind model, and solve that for comparison.

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