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Here are the details in as concise a manner as possible:

1. I'm using In-compressible Navier Stokes Module in laminar flow, time dependent solution.

2.I have a rectangular region in which I have some fluid.

3.there are cilia inside the fluid, which move with a time and space-varying velocity V=ycos(5t+6x)\

4. However, the movement of the cilia is oscillatory, so the net velocity of the fluid is some other value, say U

5. there is a bulk/volume force acting on the fluid, which is a function of both U and V...say |F|=(U-V)...

6. Obviously, U is also time varying, and determined by V....so how do I define it in COMSOL?

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# How to define a value that is evaluated through iteration in COMSOL 4.0

Can you offer guidance or do you also need help?

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