Hello Nektar++ users,

I have been experiencing unusual results while simulating cylinder flow with the incompressible Navier-Stokes Solver. When running the simulation at higher Reynolds numbers such as Re = 3900, the flow does not appear as would be expected.  The early wake looks too unsymmetric, with one of the first vortex growing to an unusually large size before shedding.  After running the simulation for a long period of time the vortices still look quite unusual, lacking the symmetry that would be expected in the vortex street.

In trying to solve this issue I have checked the turbulent length scale and ensured I have enough mesh resolution. I also have used a small time scale of 0.0001.

 

I was wondering whether anyone had advice on what I might be doing wrong or how I may attempt to fix the issue. I have included some of the results of the vorticity contours and the .xml conditions in hopes someone recognizes why the simulation is not behaving as expected. 

Thank you,

Matt Duran

PhD student

University of Central Florida