Neumann BC at the outlet in laminar flow module

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I'm trying to solve a microfluidic flow problem where inlet BC is velocity (dirichlet BC) and outlet BC is velo flux (neumann BC). In the laminar flow module, i do not get option for neumann BC @ outlet.

Comsol manual states that velocity @ inlet and outlet is not feasible. It has to be velo and pr or vice-versa.

The solution converges fine with velo @ inlet and pr BC @ outlet but the axial pr gradient does not match solution in literature.

Any help/advise is appreciated.


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