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Water fountain from a vertical pipe inside another water body with lesser density

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Old   March 25, 2020, 12:10
Question Water fountain from a vertical pipe inside another water body with lesser density
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Ahsan
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Hello Fellows,

I am doing a master thesis in Italy and I need to simulate a case in OpenFOAM.
The case is of a vertical pipe nozzle (that ejects water like an underwater volcano, just to explain), while the outlet of the nozzle pipe is actually immersed inside another water body of lesser density. I am not able to find any tutorial that can simulate this condition.
I guess it is a multiphase problem (since there are two fluids of different densities). I am new to OpenFOAM, although I know how to create blockMesh and also familiar with snappyHexMesh. I am planning to create STL file for the pipe and import it into the blockMesh using snappyHexMesh.

But how can I simulate this particular condition? How can I describe one end of the pipe as inlet and other as the outlet while the outlet part is 20 cm under the water? Please help me
Thank you, people!
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Old   March 26, 2020, 04:14
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Alexey Matveichev
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Hi,

You just need inlet patch (which is created by snappyHexMesh). Outlet of the tube is inside simulation domain, so there is no boundary conditions there.

You can adapt almost any interFoam tutorial to your case.
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Old   March 29, 2020, 12:33
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Quote:
Originally Posted by alexeym View Post
Hi,

You just need inlet patch (which is created by snappyHexMesh). Outlet of the tube is inside simulation domain, so there is no boundary conditions there.

You can adapt almost any interFoam tutorial to your case.
Thank you so much alexeym for the response. I have made the geometry(inlet, pipe, tank, everything), I even used setFieldsDict to set my fluids in the domain.
But when the simulation goes on, I see that the velocity U is coming out from the pipe into the tank, but the fluids are not mixing at all, I mean I don't understand which fluid's velocity is this.

I am using interMixingFoam in 3D. The inlet is at the bottom center of the tank.
I have uploaded my simulation photos, showing heavy and light water at 0.125 seconds, as well as velocity at times 0, 0.025 and 0.125 seconds.
Attached Images
File Type: png 1.png (13.6 KB, 5 views)
File Type: png 2.png (10.5 KB, 5 views)
File Type: png 3.png (16.3 KB, 6 views)
File Type: png 4.png (20.5 KB, 6 views)
File Type: png 5.png (22.4 KB, 5 views)
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Old   March 29, 2020, 12:42
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My heavy water is not coming out of the pipe into the tank to be mixed with the lighter water
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Old   March 29, 2020, 16:52
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Hi,

From attached figures it is difficult to say if your geometry/mesh/boundary conditions are correct. Could you post mesh coloured by patch IDs? Could you post checkMesh output?
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Old   April 4, 2020, 07:26
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Quote:
Originally Posted by alexeym View Post
Hi,

From attached figures it is difficult to say if your geometry/mesh/boundary conditions are correct. Could you post mesh coloured by patch IDs? Could you post checkMesh output?
Dear Alexeym, Thank you so much for your help. As you suggested about the inlet condition, I tried to work on that. The problem was that I was using a wrong velocity condition for my inlet.

I used flowRateInletVelocity now and everything works fine.
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fountain, nozzle, pipe, underwater pipe

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