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Dear All,

When I increase the polynomial order from 5 to 6, the flow field becomes unphysical. It reaches a frozen state in which the solution does not change with time anymore!

I have provided two planar snapshots of the flow fields for p=5 (first) and p=6 (second) below:

p=5.jpg
p=6.jpg
As you can see in the images above, p=6 resulted in a weird wake pattern (frozen in time) which is not physical either. 
My case is a 3-D low-Re flow and I am using the incompressible solver.
I was wondering if something may be wrong with what I am doing, or if there is a specific issue with the numerics. Any help would be appreciated.

Kind regards
syavash