[Sérgio Cavaleiro Costa]

Hello Grace! I am not aware of what you are trying to solve, but this is a very small domain where you find a velocity considerably high (for the domaine size). Look at how much time a particle need to take from the entry to the outlet of your domain. It is a very small time interval. Furthermore, this domain is discretized, so the cell elements may be very close to the minimum size of the assumption of a continuum.

Relatively to the convergence, you should look to your Courant number (you may also find the name CFL number). This may give you a clew about the reasons to the slow convergence, but I also suspect it is related with my previous points.

• This reply was modified 2 years, 3 months ago by  Sérgio Cavaleiro Costa.