fem solve versus fem solve restart

MARCH8

In MARCH8.f you will see that fem solve to 0 (a commonly used fem command), sets up the appropriate data structures for future solves AND takes one time step. Note that some people may believe that fem solve to 0 just sets up structures without doing one solve.

Often people do a fem solve to 0 followed by a fem solve restart to 0. What happens in the fem solve restart to 0 is that another time step is taken so that afterwards we are at time T=2*dt. It would probably make more sense to follow fem solve to 0 with fem solve to 1.

On the other hand you could start by saying fem solve to 1 and then future calls would be fem solve restart to 2, for example.