Keeping inlet water height constant
 

Hello,

I have a rectangular domain half-filled with water. The inlet and outlet are defined at the two sides of domain (inlet on the left and outlet on the right), and the water flows from the inlet to the outlet. The domain contains a number of square obstacles.

I want to keep the water height at the inlet constant. When the water hits the obstacles the upstream water height increases. But I want to make sure that this does not happen and the inlet water height is always constant.

Any ideas how this can be done?

Thank you in advance,
Alireza