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-   -   boundary conditions for 2D flow around a circle (http://www.cfd-online.com/Forums/main/75272-boundary-conditions-2d-flow-around-circle.html)

abcdef123 April 21, 2010 02:26

boundary conditions for 2D flow around a circle
 
Can anyone tell me (or point me to a reference) about the boundary conditions for 2D flow around a circle. I think I use a velocity inlet on the left, outlet on the right, and free stream on the top and bottom? My problem I think is how to specify the free stream boundary conditions for velocity and pressure (using the SIMPLER method).

For the circle I use wall boundary conditions, zero gradient pressure and wall functions for velocity.
For the inlet I am setting the velocity and allowing the pressure to be solved.
For the outlet I am setting the pressure to zero and apply a zero gradient to the velocity. Is this correct?

My reason for this is in trying to solve stability issues, where my code becomes unstable after a Re number of about 500. Any help is appreciated, thank you in advance.


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