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Fluent Problem-Two phase Poiseuille flow between two plates

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Old   February 24, 2016, 17:29
Default Fluent Problem-Two phase Poiseuille flow between two plates
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I am trying to use Fluent to solve a simple problem, the two phase flow between two parallel plates, for my course project.

The physical model is described here:
Or here:
I am trying to get the same result numerically.

My mesh is like this:

2D planar steady state problem.
I am using VOF and Laminar models. Didn't change setting.
I have two fluid with same density but different viscosity. I think the result should not be a function of density.

I meshed the interface.
I tried on "coupled wall", but the velocity is set to 0 at interface. I don't know how to make the wall is shear stress balanced.
Without "coupled wall", the velocity is continuum at the interface, but fluid will cross the interface, which is not what I want. Like this (contour of void fraction):

My question is, what should I do to make an interface in the middle such that the two fluids can't cross it, but balanced with shear stress?

Thank you very much.
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fluent, interface, poiseuille, two-phase

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