hello,
i´m working on an unsaturated transient 2D problem. First tried it as steady, and there the simulation went well, after adjusting the problem settings.
Now I tried it with transient information, so i put my time series in the modell.
I choose "automatic time step control" with an inital time step 0.1d , numerical parameters with 100 iterations and the SAMG solver changed to 1e-04 termination criterion.
BUT if I start the simulation, the time steps are very very small and don´t get bigger over time, so even after an hour of computing, the simulation was not finished with even the first of more than 100 days. (see picture[PDF] )
I checked the observation points hydraulic heads- they were stable.
What could be the problem? I really tried to changed SAMG solver or numerical parameters in different ways, but never got the simulation over 1 day of time.