# Best way to get rid of turbulent flows?

I am making a testing facility for pumps. This facility has to be able to handle 500 m3/h with at little turbulence as possible. The basin itself is 5 meters long, 2,5 meters wide and 2 meters tall. The water level in the basin is kept at 1,9 meters.

The basin is designed in two sections: the first is where the discharge flow comes into the basin (pipe ends about 1 meters in from the bottom). In that area the water flows freely.

After that it has to flow over the retaining wall (1.7m high), which should create a somewhat uniform flow.

Are there better solutions to do this?

One other idea I have is a retaining wall somewhat like this:

This makes for three plates with cutout stripes.

The idea behind this is to have a more uniform flow across the entire basin instead of a overflow, making it create a small bit of turbulence there.

• Do you have more specific requirements? Can you suggest an adequate Reynolds number or criteria for turbulence? Commented Mar 30, 2016 at 12:33
• Is the retaining wall just there to smooth flow? What's the point of trying to eliminate turbulence in your tub - you're almost certain to have turbulence at the suction of the pump at those flows. Commented Mar 30, 2016 at 12:56
• @willpower2727 I have been looking into Reynolds, but i find it hard to come up with a good solution to make that calculation. What would be a good goal? should i be using the area above the wall as surface area?
– Arjo
Commented Mar 30, 2016 at 13:02
• @Arjo I rarely do fluid calculations, but you could look into finding a hydraulic diameter for the tub:en.wikipedia.org/wiki/Hydraulic_diameter Commented Mar 30, 2016 at 13:08
• I'm hardly an expert, but I would consider replacing the upper portion of the solid partition (above the level of the discharge pipe openings) with a couple of layers of some sort of metal mesh or screening. I assume the tank is kept fairly full (1.5 - 1.8 m) during a test. Commented Mar 30, 2016 at 14:15