2d Cylinder with 'high' Re stability issues

I’ve modified the 2d cylinder example and wanted to increase the Reynolds number up to 6000 to see how it performs. I’m using MRT dynamics as well. Beyond that I’ve left the example mostly as-is. I’ve uploaded the image of what happens after about t=0.3 sec into the simulation. Something is happening at the outlet boundary and I don’t know how to remedy it. Any ideas on how to change the boundary or simulation to get rid of this issue?



Whether ur solution is converging or getting NAN values?
Check Avg Energy and Avg Density.
If you solution is blowing up, change your relaxation time and run the simulation.


What resolution were you using? Maybe increasing it does the trick. Also you could try changing the boundary condition to


The regularized BC implemented somehow tend to fail at higher Reynolds numbers.