Real transient behaviour

Sara

Hi,

I have a transient simulation where I expect the solution never to reach a steady state (perhaps a periodic steady state though). However this is not the case (it reaches steady state quite rapidly). How come? I have a few suggestions, can you please tell me what you think?

1. Using an implicit method I might have too high time step at some points in the simulation, thus violating the CFL condition, and hence not describing the transient behaviour adequately.

2. Using an implicit method of 1st order the resolution in time might not be enough (coupled to nr 1 above).

3. The simulated system is symmetrical, but the physical system might be - not fully symmetrical.

Best Regards

Sara