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human head skull stimulation by current source electrods

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Hi

I am new to Comsol. I have tried to build a simple model resembling human head including three layers of skull, csf and brain using the provided conductivities. I then built a tri-pole electrode which the center one is grounded and the middle and the outer layer are given a current or current density.

My problem is that I fail to get any solution and I face an the following error:

Failed to find a solution.
Segregated group 1

Singular matrix.

There are 12414 void equations (empty rows in matrix) for the variable mod1.V
at coordinates: (-0.00104638,-0.000753554,0.10675), (-0.000753557,-0.00104637,0.10675), (-0.00119282,-0.000400008,0.10675), (0.0013,4.30826e-019,0.10675), (-2.29715e-020,0.00115,0.106625), ...
and similarly for the degrees of freedom (empty columns in matrix)
Returned solution is not converged.


1 Reply Last Post Feb 24, 2014, 12:30 p.m. EST
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Hello Babak Ossia

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Posted: 1 decade ago Feb 24, 2014, 12:30 p.m. EST
wer can i get basic tutorials to devolp head model in comsol pls
thank u
wer can i get basic tutorials to devolp head model in comsol pls thank u

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