Hydraulic jump

The King · February 14, 2011, 16:59

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 14, 2011, 23:12

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, 16:54

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, 07:57

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, 12:45

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

February 14, 2011, 16:59	Hydraulic jump	#1
The King Member Arnout Join Date: Nov 2010 Posts: 46 Rep Power: 14	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

February 14, 2011, 23:12		#2
santiagomarquezd Senior Member Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 452 Rep Power: 22	If you can read spanish, here it's that you are looking for: http://www.amcaonline.org.ar/ojs/ind...view/2826/2763 Regards. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

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February 15, 2011, 16:54		#3
The King Member Arnout Join Date: Nov 2010 Posts: 46 Rep Power: 14	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

November 24, 2011, 07:57		#4
niravtm007 Member Nirav Join Date: Jul 2011 Posts: 43 Rep Power: 13	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

November 24, 2011, 12:45		#5
mgdenno Senior Member Matthew Denno Join Date: Feb 2010 Posts: 138 Rep Power: 15	It should work in 2d. If you post your case I will take a look at it.