Modeling of a channel flow with water and air

Bazinga · May 7, 2014, 08:32

Hello,

I have a good understanding of CFD and have worked with ANSYS CFX for quite some time now, but to this point I only dealt with air and wind engineering problems.

Now, I wanna simulate the flow of a river over an obstacle and I can not figure out how I can set my Inlet to have both: Water at the bottom of the domain with a given height and air above the water of course.

Any help is highly appreciated, thanks in advance!

ghorrocks · May 7, 2014, 09:05

Have a look at the tutorial example: free surface flow over a bump. It does exactly what you ask.

Bazinga · May 7, 2014, 10:59

Thank you very much. I tried the tutorial for my geometry and the solver is running right now. The only problem is that I get and error that air and water is flowing into my domain at the outlet although it shouldnt in a physical sense.

Bazinga · May 8, 2014, 09:53

Maybe someone else has the same problem: I found the solution by adjusting the horizontal and vertical component of the coordinate system. In the tutorial y is the vertical axis.

May 7, 2014, 08:32	Modeling of a channel flow with water and air	#1
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 16	Hello, I have a good understanding of CFD and have worked with ANSYS CFX for quite some time now, but to this point I only dealt with air and wind engineering problems. Now, I wanna simulate the flow of a river over an obstacle and I can not figure out how I can set my Inlet to have both: Water at the bottom of the domain with a given height and air above the water of course. Any help is highly appreciated, thanks in advance!

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May 7, 2014, 09:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,816 Rep Power: 144	Have a look at the tutorial example: free surface flow over a bump. It does exactly what you ask.

May 7, 2014, 10:59		#3
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 16	Thank you very much. I tried the tutorial for my geometry and the solver is running right now. The only problem is that I get and error that air and water is flowing into my domain at the outlet although it shouldnt in a physical sense.

May 8, 2014, 09:53		#4
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 16	Maybe someone else has the same problem: I found the solution by adjusting the horizontal and vertical component of the coordinate system. In the tutorial y is the vertical axis.