Global Equations defined variable has singular matrix problem?

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Shuai Ge

Shuai Ge

March 31, 2014 10:00pm UTC

Global Equations defined variable has singular matrix problem?

Dear support,

Does anyone ever meet the following error when using global equations to define a variable as source? I am trying to simulate in 4.3a the enclosed volume of fluid following the COMSOL Blog: www.comsol.com/blogs/computing-controlling-volume-cavity/
Following the guideline in this blog, I can simulate incompressible fluid by using global equations to define the inner pressure in 2D, but the error comes out when I translated it into a 3D model.

Could anyone please give some hint on possible reason? Thanks.

****************************************
Failed to find a solution.
Singular matrix.

There are 1 void equations (empty rows in matrix) for the variable comp1.Inner_pressure.
at coordinates: (0,0,0), ...
Returned solution is not converged.
****************************************

Attachments:   3D_cavity_volume.mph  

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