boundary condition between porous and fluid zones
 

hi every body
I'm trying to model a porous media inside a cylinder, this cylinder is in contact with an annulus which is a fluid zone. what should be the proper boundary condition between this two zones.

thanks for any help

Hi, Mansureh,
Using boundary condition type interior or interface for the interface between the two zones is OK.

hi xrs333
thanks very much for your help. and could you tell me what the difference between interior and interfaceboundary conditions is? and can I use porous jump BC instead?

kind regards

Not really familiar with your case, but:

1. Interior is composed of only one surface. hence, its mesh is that of the surface itself.

2. Interface is composed of two surfaces - one IN and one OUT. The nice thing is that therefore the same physical surface contains two "model" surfaces and they can have different meshes. Interpolation between IN & OUT is used for the solution at that surface.

The interface is extremely useful to make your meshing problem easier. For instance, while coopering in a certain direction you might stumble upon another coopered mesh coming in the opossite direction of your model: and then you have the problem of making them compatible.

regards

Hi cactilio86

thanks for your help.

how can we get more information on this type of boundary conditions?