Hi,

I'm trying to run a small, high speed, centrifugal compressor with and without a shroud to see the impact it has, but I seem to be getting some pretty weird results and have no idea why!

It does reach supersonic speeds, but never exceeds Mach 3, so the lack of 'high mach number' option shouldn't be an issue (I think - it does occcasionally print the high mach number warning message advising the high mach number option, but this usually dissapears pretty quickly), and even running at half speed I get similarly odd results.

I've attached the file, so if someone could have a look and give me some advice I'd really appreciate it! Let me know if you'd like any more info about it.

I've also attached a screenshots of one of my results files to show you what I mean by weird results

I've included a lot of goals to try to work out what going on and a lot don't fully converge, so it's likely to need stopping manually, and running with a coarse mesh should give a good idea of the results I seem to be getting.

Being new to flow simulation I'm not sure if I'm just missing something obvious here, I assume there's something wrong with how I've set it up or the model itself, but I'm out of ideas as to what.

Thanks