[Nek5000-users] Outflow Boundary Condition Clarification

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

I think you should try the stabilised O condition, as described in a 
paper by Dong (2014). We have an implementation of that, we should 
probably provide it as a module in the repository.

best regards,
Philipp

On 2018-02-02 20:10, nek5000-users at lists.mcs.anl.gov wrote:
> 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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