[Testing] Invertibility of the elasticity tensor for viscous dissipation #87
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Testing the influence of the penalty on the viscous dissipation calculation.
From the numerical tests, m>100, to achieve an accuracy better than
1e-6, taking the trace of the elasticity tensor as scaling factor.There is no difference on takin the inverse or taking the of C, since they differ on the determinant of C, which is roughly 1.