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Old   October 4, 2010, 10:02
Post BC flux
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Hi Foamers,

If i am solving a certain scalar transport equation of a scalar variable "C" in simpleFoam.

How to set a "zero Flux" Boundary condition on a patch wall for the "C" Field?

help please

thanks a lot
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Old   October 4, 2010, 10:16
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Hello,


do you mean a zero flux BC normal to the boundary face for the scalar quantity C? In that case it simply means you'll have to set dC/dn=0, i.e. zeroGradient.


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Old   October 4, 2010, 11:00
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Hi ,
yes indeed i need to set that which is normal to the boundary surface

is it the same as zeroGradient?
because i need only zero flux in the direction normal to the surface, and not in all directions.

help please

thanks a lot
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Old   October 4, 2010, 11:10
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Felix L.
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Hi,


zeroGradient is exactly what you need: it sets dC/dn to zero (like I said in my previous post), where n is the normal unit vector of the boundary face. For more information please refer to http://www.openfoam.com/docs/user/bo...24-1380005.2.3 .


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Old   October 4, 2010, 13:45
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thanks a lot.
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