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Interpolating velocity to an interface in icoFoam (PISO)

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Old   October 22, 2013, 12:51
Default Interpolating velocity to an interface in icoFoam (PISO)
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I would like to add some steps to the icoFoam solver.
I want to interpolate velocity to the interface (black nodes in the picture below).
The interface is going to represent a boundary by adding an extra force term to the navier stokes equation.
Does anybody know how i can create such an interface and then interpolate the velocity at the mentioned points?
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