[sfepy] Re: Material coefficients with time derivatives of field variables

Hey Robert,

I've got trouble for field-variable-dependent matrix.

For example, if a stiffness matrix is strongly dependent on u and grad u, then I use the way shown in examples, call pb.evaluate(). It seems that it cannot work well when the pdes are too complex (multiphase multiple component flows).

Are there any other ways to calculate variable-/grad_variable dependent matrix?