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human head skull stimulation by current source electrods
Posted 4 déc. 2011, 21:35 UTC−5 Low-Frequency Electromagnetics, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers 1 Reply
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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.
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Hello Babak Ossia
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thank u