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Coupling Problem: Out of memory during LU factorization

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Hi,
I am trying to couple joules heating with laminar flow in 3D geometry using COMSOL 4.1 (64 bit win XP OS). However I am getting the following error while solving:

Failed to find a solution.
Out of memory during LU factorization.
Returned solution has not converged.

Does the solver setting need to changed? I shall be highly obliged if anyone can kindly help.

Thanks and regards,
Debashis

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