On Friday, September 16, 2016 at 1:38:57 AM UTC+5:30, Bruno Turcksin wrote:
> I don't see anything wrong. The output says that your error is zero,
> are you doing a simple ramp in time? It's very strange that the error
> is exactly zero. What happens if you just use the default parameters?
> Does step-52 work correctly? The delta_t_guess is computed around line
> 715 in include/dealii/base/time_stepping.templates.h You could put a
> couple of cout there to see what's happening (you will need to
> recompile deal though)
The error being exactly zero is indeed intriguing. I'm still looking out
for the reason why that is happening. I didn't understand what you meant by
a "ramp in time". Could you please elaborate?
Step-52 works fine, I'm getting exactly the same results as the online
documentation. I looked at time_stepping.templates.h, I think there is a
bug around line 730, delta_t_guess should be assigned the value of
new_delta_t (the coarsened time step) rather than delta_t (old time step).
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