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

Hi Max,

On 16/06/2021 23:37, Max Maximilian wrote:

Hey all,

I found my script cannot successfully compute the volume_dot matrix including time derivatives of field variables, since it stayed 0 at all time.

By that you mean that liquid_saturation_dt stays zero?

There might be a bug that manifests in multiphysics problems (with several variables and time derivatives). I will have a look.

Does it mean I need to reformulate the equations that exclude time derivative terms?

If you could avoid using variables with history, that might help in the meantime.

Thanks for the report! r.