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-   -   Setting of gradient type B.C. in Phoenics (https://www.cfd-online.com/Forums/phoenics/84890-setting-gradient-type-b-c-phoenics.html)

black_spider February 10, 2011 21:13
Setting of gradient type B.C. in Phoenics
 
hi guys, I wanna set gradient type boundary condition in simulation domain. How to do this in Phoenics?

like this: \frac{\partial \Phi}{\partial n}=0

and also such equation as B.C: \nabla (\epsilon \nabla \Phi)=0

Is GROUND coding helpful in these cases?

black_spider April 25, 2011 06:59
hope for the best.

I have set the gradient type B.C. as follows:

CO as Fixflu and VAL as 0

Seems work good. Any more suggestion? Please let me know.

algin May 4, 2011 07:16
Quote:
Originally Posted by black_spider (Post 294738)
hi guys, I wanna set gradient type boundary condition in simulation domain. How to do this in Phoenics?

like this: \frac{\partial \Phi}{\partial n}=0

and also such equation as B.C: \nabla (\epsilon \nabla \Phi)=0

Is GROUND coding helpful in these cases?
No ground coding is needed.
The zero flux is default boundary condition. Therefore you need not set anything on such bounds. If you want to use non-zero flux on bound then you should set CO=FIXFLU with one of EAST, WEST, SOUTH, NORTH, LOW or HIGH types of patch.


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