CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM (http://www.cfd-online.com/Forums/openfoam/)
-   -   Hydraulic jump (http://www.cfd-online.com/Forums/openfoam/84993-hydraulic-jump.html)

 The King February 14, 2011 17:59

Hydraulic jump

Hi,

I'm trying to simulate a hydraulic jump. Using VOF model, turbulent. Geometry is easy, slope of 5 degrees and a obstruction on the bottom. The water level before the opstruction is high, a little higher than the obstruction. Behind the obstruction, the water level is low and the velocity is much higher. But now hydraulic jump, the water level stays low.
If I do experiments, I see a hydraulic jump. In my setup, Fr>1 andRe >10000. I use wall functions in a 2D geometry.

Any idea wat I'm doing wrong? Is it possible to model hydraulic jumps in 2D or do I missed some physical understanding? Is there someone trying this before in OpenFoam? I have seen some fluent 2D calculations whit a hydraulic jump.

Thank you!

Arnout

 santiagomarquezd February 15, 2011 00:12

If you can read spanish, here it's that you are looking for:

http://www.amcaonline.org.ar/ojs/ind...view/2826/2763

Regards.

 The King February 15, 2011 17:54

Hi!

Thabo you. My case is different from the one in the article, I'm looking ar a jump behind a obstacle on the bottom. Let's see it as a river with a stone in it.
Going to try it with fluent now, wil keep Cfd online updated!

Any other hints are still welcome!!

Arnout

 niravtm007 November 24, 2011 08:57

hii king can you please help me set up a geometry and can you tell me what results you obtaned using fluent, i'm also trying to simulate a hydraulic jump using fluent. do let me know what conditions you applied

 mgdenno November 24, 2011 13:45

It should work in 2d. If you post your case I will take a look at it.

 All times are GMT -4. The time now is 03:51.