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September 2, 2010 3:17pm UTC

Navier-Stokes on ALE

Hello,
I'm new to COMSOL and I'm making a 2D model of a rectangular pipe with a middle boundary that propagates as a wave. I want to solve the Navier-Stokes equations w/ water in the pipe. I calculated first the mesh velocity according to the boundary conditions, but then when I went to solve for u_ns the solver didn't acknowledge the ns variables "T" and it seemed like it was trying to solve the Laplace equation with the navier-stokes eq as an input. Not sure why this is happening. My model has Navier-Stokes in the ALE geometry as the ruling application mode. Do I need maybe to construct my own PDE instead for the NS where I first calculate the moving mesh velocity and then put the answer for this into the NS term (u dot del)u so that it accounts for the mixing of geometries and looks like ([dxt, dyt] dot del) u in the ns eq? Thanks for any help...hope my intent is clear.
Robert

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