BC flux

T.D. · October 4, 2010, 10:02

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

FelixL · October 4, 2010, 10:16

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.

Greetings.

T.D. · October 4, 2010, 11:00

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

FelixL · October 4, 2010, 11:10

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 .

Greetings.

T.D. · October 4, 2010, 13:45

thanks a lot.

October 4, 2010, 10:02	BC flux	#1
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 16	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

October 4, 2010, 13:45	thanks	#5
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 16	thanks a lot.

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October 4, 2010, 10:16		#2
FelixL Senior Member Felix L. Join Date: Feb 2010 Location: Hamburg Posts: 165 Rep Power: 18	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. Greetings.

October 4, 2010, 11:00	Hi	#3
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 16	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

October 4, 2010, 11:10		#4
FelixL Senior Member Felix L. Join Date: Feb 2010 Location: Hamburg Posts: 165 Rep Power: 18	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 . Greetings.