I'm trying to simulate a simple case of external flow, a solid sphere with 5cm diameter against a air flow in X direction, but when i try to run the simulation it get stuck in the preparing model phase, i have been waiting for a while but nothing happens and the processors don't look like they were working. i'm running it on a workstation with 2 Xeon CPU E5 2630 V4 2.20Ghz with 64gb RAM so i don't think that it could be a computational resource problem.