In fact, it’s like the bottom plate has some holes where the fluid enters and leaves with a certain velocity defined by a boundary condition: (du/dy = alpha/ sqrt(k)) * (ui – um). That is, I need to set this condition exactly on the bottom wall.
Note that if this problem were to be solved analytically, I would have two boundary conditions.
(1) When y = 0 ==> du/dy = alpha/ sqrt(k)) * (ui – um) (2) When y = h ==> u = 0
For the top plate the boundary condition it’s just a no-slip condition that can be set easily by fluent. But on the bottom plate I would need to put the equation: du/dy = alpha/ sqrt(k)) * (ui – um).
In short, what I really need to know how I can put an equation as a boundary condition on the bottom plate.
!Note that the plates are fixed.
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