esys-escript

how is grad calculated

Asked by ceguo

Hi everyone,

I wish to check how the 'grad' operator is executed but cannot locate the source file. I'm trying to understand how displacement gradient u_{i,j} is obtained instead of the symmetric strain epsilon_{ij}. In matrix form using Voigt notation, we can get (eps_11, eps_22, gamma_12)^T using the strain-displacement matrix B. I guess u_{i,j} cannot be calculated using the matrix form.

Thanks,
Ning

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Lutz Gross (l-gross) said : 		#1

You cannot access the gradient-displacement matrix on the python level. Deep on the C/C++ level such a matrix is been used to calculate the gradients although for some of the solver the matrix is not explicitly been constructed. Hope this helps.

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