Setting of gradient type B.C. in Phoenics

black_spider · February 10, 2011, 21:13

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

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.

February 10, 2011, 21:13	Setting of gradient type B.C. in Phoenics	#1
black_spider New Member designer spider Join Date: Sep 2010 Posts: 7 Rep Power: 15	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?

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April 25, 2011, 06:59		#2
black_spider New Member designer spider Join Date: Sep 2010 Posts: 7 Rep Power: 15	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.