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 Meratb September 1, 2009 09:22

interFoam / bubbleFoam to simulate an aerated tank

2 Attachment(s)
Hello,

I am a student in applied mathematics and quite new to OpenFOAM. I have been using it for a few months and read part of Henrik Rusche's thesis but I am still facing some difficulties.

I would like to simulate a tank with a gas inlet at the bottom of the tank and an inlet of liquid on the left. The outlet of liquid is on the right side of the tank and in the final simulation that shall be a free overflow outlet.
To do so, I have already tried with both interFoam and bubbleFoam. The attached files show some results.

I want to compute for a balance of gas and liquid inside the tank to check that the Gauss' theorem is fulfilled. Yet, it seems to me that the VOF method used in interFoam is computing for only one velocity field for both phases. Only one vector U is written out.

My first question is therefore how one could then e.g. detect rising air in the liquid phase?

Is there a way to discern the velocities of the two phases?

Some other combined cases (free surface plus aeration) are also interesting me. For instance, taking into account the effect of a structure in an aerated tank such like a wall that may involve waves at the interface between air and water, (i. e. the water surface). The letter may be achieved by interFoam, whereas bubbleFoam seems more appropriated to model the aeration of the tank.

In a second example, if the aeration field is close to the outlet, both gas and liquid may go out of the tank by the outlet and the flow situation of the free overflow surface would be influenced by the bubble flow.

Is it possible to combine the two solvers in such a way that the two models are either solved together or interdependent with the disperse approach inside the liquid and the VOF for the free surface resp.? Is there perhaps already a tutorial/example available?

Best regards,

Baptiste

 theghost75 June 8, 2011 09:08

Quote:
 Originally Posted by Meratb (Post 228117) Hello, I am a student in applied mathematics and quite new to OpenFOAM. I have been using it for a few months and read part of Henrik Rusche's thesis but I am still facing some difficulties. I would like to simulate a tank with a gas inlet at the bottom of the tank and an inlet of liquid on the left. The outlet of liquid is on the right side of the tank and in the final simulation that shall be a free overflow outlet. To do so, I have already tried with both interFoam and bubbleFoam. The attached files show some results. I want to compute for a balance of gas and liquid inside the tank to check that the Gauss' theorem is fulfilled. Yet, it seems to me that the VOF method used in interFoam is computing for only one velocity field for both phases. Only one vector U is written out. My first question is therefore how one could then e.g. detect rising air in the liquid phase? Is there a way to discern the velocities of the two phases? Some other combined cases (free surface plus aeration) are also interesting me. For instance, taking into account the effect of a structure in an aerated tank such like a wall that may involve waves at the interface between air and water, (i. e. the water surface). The letter may be achieved by interFoam, whereas bubbleFoam seems more appropriated to model the aeration of the tank. In a second example, if the aeration field is close to the outlet, both gas and liquid may go out of the tank by the outlet and the flow situation of the free overflow surface would be influenced by the bubble flow. Is it possible to combine the two solvers in such a way that the two models are either solved together or interdependent with the disperse approach inside the liquid and the VOF for the free surface resp.? Is there perhaps already a tutorial/example available? Best regards, Baptiste
hi, i am new in OpenFoam, I would similate bubbleFoam with interFoam, ie: inlet is wave, outel is pressure but I can't introduce the air bubble at bottom....
how can I do this plz????

Nb: excuse me for my worst english!!

cordialement.

 santiagomarquezd June 9, 2011 07:35

Quote:
 Originally Posted by Meratb (Post 228117) [...] Some other combined cases (free surface plus aeration) are also interesting me. For instance, taking into account the effect of a structure in an aerated tank such like a wall that may involve waves at the interface between air and water, (i. e. the water surface). The letter may be achieved by interFoam, whereas bubbleFoam seems more appropriated to model the aeration of the tank. [...] Is it possible to combine the two solvers in such a way that the two models are either solved together or interdependent with the disperse approach inside the liquid and the VOF for the free surface resp.? Is there perhaps already a tutorial/example available? Best regards, Baptiste
Baptiste, there are some approaches to your topic:

http://www.sciencedirect.com/science...2199910196810X

http://onlinelibrary.wiley.com/doi/1....2978/abstract

this topic is quite novel and solutions are, a sometimes, a bit specific. There is another approach by Bohorquez using VOF+mixture, but between air-water-particles:

http://infoscience.epfl.ch/record/13...ezPatricio.pdf

I'm following this approach to solve cases like yours, i.e. aerated tanks, pipes with different size bubbles, etc. I'm working on the model combination right now, maybe we can share some experiences, papers, test-cases, experiments.

Regards.

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