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[comsol 3.5a] Radiative surface to surface exchange

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Hello to all
I have a problem with a thermal analysis.I have a 3D geometry and i must analyze a transient situation with radiative exchange between surfaces. I have read pdf help and i found some useful advices but in 2D geometry. I understood that i must pay attention with group assignment, for this reason i started using only five surfaces with surface to surface radiative exchange but the solver went in out of memory during assembly with error 6188. I made a transient analysis because i want to discover the T gradient in the instrument.
I don't find where is my mistake.
Thank you in advance

Luca

2 Replies Last Post 4 gen 2011, 03:51 GMT-5
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Hello Luca Ferrario

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Posted: 1 decade ago 3 gen 2011, 14:52 GMT-5
Hi!

I have exactly the same problem in my simulation. I also want to carry out a transient analysis of a 3D piezoeletric solid and the error 6188 appears "Out of memory during assembly". I have 4 205 796 degrees of freedom to be solved. I am wondering if these are to much dofs to solve for Comsol 3.5, because I have launched the same simulation in ANSYS 11, in the same computer, and I had no problems.

If you find a solution for your problem, please let me know since it might work for me too. I have no idea how to solve the problem.

Thanks,
Mar
Hi! I have exactly the same problem in my simulation. I also want to carry out a transient analysis of a 3D piezoeletric solid and the error 6188 appears "Out of memory during assembly". I have 4 205 796 degrees of freedom to be solved. I am wondering if these are to much dofs to solve for Comsol 3.5, because I have launched the same simulation in ANSYS 11, in the same computer, and I had no problems. If you find a solution for your problem, please let me know since it might work for me too. I have no idea how to solve the problem. Thanks, Mar

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 4 gen 2011, 03:51 GMT-5
Hi

do you have the same number of DoF in ANSYS ?
as 4.2MDoF means a lot of RAM

--
Good luck
Ivar
Hi do you have the same number of DoF in ANSYS ? as 4.2MDoF means a lot of RAM -- Good luck Ivar

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