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How to set up volume force to drive the flow

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Old   June 8, 2016, 06:56
Default How to set up volume force to drive the flow
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Hi guys,
I am simulating a 3D turbulent open channel flow in OpenFOAM. I successfully set up the cyclic boundary conditions at inlet and outlet, and I wish to set up a constant volume force (some people also regard it as a constant pressure drop) inside the whole domain to drive the flow.

I checked many forums but only found a "fan" type. With "fan" the pressure would rise in the streamwise direction. But I want a constant pressure drop. Anyone knows how to do that in OpenFOAM?

Much thanks!

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