How to specify BC as a function compiled in solver

kar · January 29, 2008, 09:50

Hello,

Recently I've been "playing" with OF quite a lot, but haven't found how to do that thing. For example I would like to write some time dependant, nonlinear C++ function for temperature on boundary. Let x,y be local coordinates on boundary surface, t - time, so I want to use BC T = T(x,y,t). Or T gradient. If local coordinates is a problem, I don't mind writing that function for global ones.
How to do this?

January 29, 2008, 15:36

Search for parabolic inlet... I remember a discussion about that earlier.

gschaider · January 29, 2008, 16:30

@martin:
The parabolic-inlet is not time-dependent. He will need a "real" boundary condition.

@karlis:
Have a look at $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/timeVaryingUniformFixedValue / as a starting point (the parabolic stuff might give you an idea how to implement the spatial part of the function)

January 29, 2008, 09:50	Hello, Recently I've been "	#1
kar Senior Member Kārlis Repsons Join Date: Mar 2009 Location: Latvia Posts: 111 Rep Power: 17	Hello, Recently I've been "playing" with OF quite a lot, but haven't found how to do that thing. For example I would like to write some time dependant, nonlinear C++ function for temperature on boundary. Let x,y be local coordinates on boundary surface, t - time, so I want to use BC T = T(x,y,t). Or T gradient. If local coordinates is a problem, I don't mind writing that function for global ones. How to do this?

January 29, 2008, 15:36	Search for parabolic inlet...	#2
unoder Guest Posts: n/a	Search for parabolic inlet... I remember a discussion about that earlier.

January 29, 2008, 16:30	@martin: The parabolic-inlet	#3
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	@martin: The parabolic-inlet is not time-dependent. He will need a "real" boundary condition. @karlis: Have a look at $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/timeVaryingUniformFixedValue / as a starting point (the parabolic stuff might give you an idea how to implement the spatial part of the function) __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

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