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Memory usage and internal DOF
Posted Mar 2, 2021, 2:23 p.m. EST Computational Fluid Dynamics (CFD), System Requirements Version 5.4 0 Replies
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Hi
I'm working on a 3D CFD model with Comsol 5.4 and tring to increese de number of elements but im runing low on RAM (i have 32GB of RAM working with an i7-4790). Im using P1+P1 (first order discretization for pressure and velocity fields) the mesh elements and DOF reported en the messege window are:
- Complete mesh consists of 697500 domain elements, 91570 boundary elements, and 2682 edge elements.
- Number of degrees of freedom solved for: 2787596 (plus 5292006 internal DOFs).
And the log reports at the end of the simultion:
- Solution time: 4356 s. (1 hour, 12 minutes, 36 seconds)
- Physical memory: 26.61 GB
- Virtual memory: 28.37 GB
I`m using the default solver configuration. Fully coupled, algebraic multigrid, GMRES solver.
It seems to me that it's using more RAM than it should, and i wonder if it has anything to do with the internal degrees of freedom. I don't really understand what they are, and I can't find anything about internal DOF. I woud like to know if they use same amount of memory as regular DOF. And if is a way to reduce them.
i'll appreciate any information about this, any other thoughts on the subject or if you can tell me if i having a wrong idea about it and my memory usage is normal
Hello Felipe Suarez
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