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Modeling flow through a thin channel

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Hi,
I'm trying to model water flow through a 2D thin channel (8 cm X 2 mm). This is part of my PhD research.
The inlet pressure is 1.5 bar, outlet pressure is 1 bar.
The walls have a no slip conditions. I'm using laminar flow, incompressible fluid at steady state conditions.
although this problem is supposed to be simple, the results show high velocities (about 700 m/s) and they change as I refine the mesh.
Can you help me define my parametes or explain what I'm doing wrong ?
I tried this on ver 3.5 and 4.2.
Best,
Avner



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