@pfernandez - this is just awesome! Great work - thanks for making this public! Will be a great project for others to learn external aero analysis!
While checking out the project, I found a few things where you could (potentially) increase the efficiency of the sim to get a faster turn-around time. Under the Numerics tree item, you can find the “Residual control” settings. With these values you can basically define a “good enough convergence” beyond you assume the simulation to be converged. The simulation will then automatically write out the last time step and end the sim. For these external aero analyses I often saw that at high enough velocities transient effects occur (e.g. stall effects at the rear end of the car) such that the pressure residual does not go below 0.0001 even though the sim is fine. So I typically start with 0.001 for p and the rest 0.0001 to have a first run.
Another hint for the linear system solver of the pressure: The default is a conjugate gradient method (PCG) but there is also a multigrid method (GAMG) available that oftentimes is faster. You might want to give it a try.
Another chance to get a faster turnaround time is the “Initialize with potential flow” setting under Simulation Control. Here the flow problem is first solved with a potential flow solution which is then used as an initialization for the actual RANS sim. Oftentimes also gives a speed up.
Looking forward to seeing more projects from you!