I want to simulate 3D flow in an open channel by SIMPLER method. But I get a problem---that is how to calculate water level H.

I use 4 governing equations. One is continuity eq. and three are the momentum equations for u, v, w (namely, dynamic water pressure rather than static water pressure is considered here).

Based on these equations, I can calculate the velocities of u,v,w and water pressure P by simple(or simpler) method. But, how to calculate water level H is a big problem for me.

Anyone can help me? your helps will be greatly appreciated. Thank you very much.

One way to do this, you may use two phase simulation with one is water and the other is air, so the water level H is just surface between water and air.

Kim

But consider the way of two phase, it seems too difficult for me. Can you provide me another approach only dealing with one phase? Thank you very much

Check the book of Griebel (Numerical Simulation in Fluid Dynamics) There and MAC-algorithm is presented for a free-surface problem.

Hope this helps Matthias

and what the publisher is? Thank you very much

You can visit their website and it has free 3D source code, it is written in C++.

And I recomend that book, too. It is a good book and easy to read.

http://wwwwissrech.iam.uni-bonn.de/r...3DGP/index.htm

Kim