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Need to set a Boundary condition

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Hello,

I am using the Transport of Diluted Species module for my simulation. I need to set an initial concentration value at a boundary. I dont want that value to be fixed. I just need it to be the initial concentration value, after which, it depletes as the concentration at that boundary disperses into the geometry.

I tried adding a concentration node to that boundary but it seems like it makes the concentration fixed at the boundary.


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