# Best way to specify coefficient fields

Asked by
Chris Richardson

What is the best way to specify coefficient fields, e.g. conductivity, permeability, elastic constants ?

I have seen the example "tensor-

I am interested in solving Darcy flow with variable permeability k (usually a scalar, but may be a tensor with diagonal entries)...

Also, elastic problems with anisotropic material whose properties vary through space.

There are 9 independent coefficients for elasticity, (out of 81 entries in Cijkl, which relates stress s_ij and strain e_kl).

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