Is any one out there doing fluid flow simulation for an open channel like the image shown below? if so what software are you using, can you recommend any reference material for this sort of thing?

The set up in the picture is a flume for rinsing apples with elevating conveyor and brush unit, we have had some success (eliminating eddy currents and turbulence) hacking together solid bodies and running through simulation express but this is very limited in terms of outputs and numerical results, and we get no usable info on the surface of the water.