Hi,

I tried to use this approach ([1]) to solve a diffusion problem with a field-dependent material as in [2], but I got:

ValueError: material data not set! (call time_update())

By adding some print-calls to the material-defining function, I found out that the function gets called, but with mode='special' instead of 'qp'.
As a result None is returned instead of the values that correspond to the initial conditions.

My question(s):
- Is the SimpleTimeSteppingSolver usable for such problem? Is there an example?
- Should I use/implement a different time-stepper?

Thanks,
Jan

[2] http://sfepy.org/doc-devel/examples/diffusion/poisson_field_dependent_material.html

On Wednesday, 18 March 2015 13:10:50 UTC+1, Robert Cimrman wrote:

Hi,

I have just updated the time stepping solvers in sfepy for interactive use, as
demonstrated in the new example [1]. For basic use, ignore the probing code -
the time stepper can be used as simply as:

tss = SimpleTimeSteppingSolver({'t0' : 0.0, 't1' : 100.0, 'n_step' : 11},
                                problem=problem)
tss.init_time()
for step, time, state in tss():
     pass

r.

[1] http://sfepy.org/doc-devel/examples/diffusion/time_poisson_interactive.html