[Nek5000-users] Outflow Boundary Condition Clarification

[nek5000-users at lists.mcs.anl.gov]

Im trying to simulate the formation of shear layer when a jet exits a
nozzle and enters the flow domain. As the FIRST vortex leaves the outlet (
at which I have provided 'O' boundary condition using genbox) the solution
diverges. I tried to implement the 'turbulent outflow' subroutine as
suggested in the forum but now the vortex affects the upstream flow. But
when I run the flow past circular cylinder example, the vortices leave the
domain without any issue even though only 'O' boundary condition is used'.
What is the difference between the two cases and what can i do to prevent
the issue?

-- 
Nitish Kovalam
Aerospace Engineering
Indian Institute of Space Science and Technology
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