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"Nonsymmetric matrix found" error and meshing
Posted Feb 22, 2013, 10:58 a.m. EST 1 Reply
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Hello,
1 - I'm simulating a Newtonian incompressible fluid flow in a porous medium (medium formed by 1000 solid grains). For a mesh of 124816 elements, the computation runs normally and I get results. But when I refine the mesh, I get the error message (Nonsymmetric matrix found) and solver stops working.
Do you have any idea of the origin of this error?
2 - Can you please tell me how can I generate a structured mesh or a mesh of hexahedral elements for the geometry of the model here attached.
Thank you.
Mehrez Agnaou
1 - I'm simulating a Newtonian incompressible fluid flow in a porous medium (medium formed by 1000 solid grains). For a mesh of 124816 elements, the computation runs normally and I get results. But when I refine the mesh, I get the error message (Nonsymmetric matrix found) and solver stops working.
Do you have any idea of the origin of this error?
2 - Can you please tell me how can I generate a structured mesh or a mesh of hexahedral elements for the geometry of the model here attached.
Thank you.
Mehrez Agnaou
Attachments:
1 Reply Last Post Feb 22, 2013, 1:41 p.m. EST
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Posted:
1 decade ago
Hi
I'm not by my WS so I cannot open your model, but a non-symmetric matrix could come from too poor mesh quality, and that imposes far more RAM as each matrix double their RAM reuirement, hence possible RAM overflow...
For random porosity, I do not know hoe to make any structure mesh, I would say standard "teth" is better as it should become more evenly distributed
--
Good luck
Ivar
I'm not by my WS so I cannot open your model, but a non-symmetric matrix could come from too poor mesh quality, and that imposes far more RAM as each matrix double their RAM reuirement, hence possible RAM overflow...
For random porosity, I do not know hoe to make any structure mesh, I would say standard "teth" is better as it should become more evenly distributed
--
Good luck
Ivar