mass flux from rock matrix to fracture

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Hello, everyone

I'm now doing TH coupling for a fractured geothermal reservoir. My model is very simple where a 2D surface (fracture) is emdedded in a 3D rock. What I want to do is to add a source term on the fracture (an interior boundary) indicating the mass flux from rock matrix to fracture. However I have no idea how to solve it.


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