Bubbles injection during water mixing

dpoly · June 11, 2019, 11:37

Dear All,
I am new in CFD domain and first-time user of OpenFoam. I am quite experience in computational methods on structural mechanics though.
I would like to ask if it is possible to simulate the air bubble formation during water mixing in OpenFoam ? I would like to hear some suggestions of what solver I could use and how to follow the bubble distribution on my domain.
Thanking you in advance for the answers.

Danai

Santiago · June 11, 2019, 13:42

Computational mechanics is a completely different world, respect to CFD. Have in mind that, fron a mathematical point of view, structural mechanics is a "solved" issue, whereas fluid mechanics isnt.

Turning back to your question: there are several approaches depending on the "kind of bubbles" you are studying, and what do you expect to get. Once you know the modelling approach, you may turn to the question of whether "OpenFOAM has it".

dpoly · June 11, 2019, 14:56

Santiago thank you for your answer and your input.

I totally understand your point and I am aware of the differences. That is the reason why I turned to this forum. I mentioned my structural mechanics background in order for others to understand that I can understand the terminology of computational methods.

Back to my question I will try to clarify a little bit. During stirring in a water tank, we have the formation of gas bubbles. I want to simulate he gas bubble formation, shape evolution and distribution inside my domain.

I was thinking to start with a Lagrangian discrete phase model where the fluid (water) will be seen as the continuum and the disperse phase will be the gas bubbles, but I am not completely sure if that is the best approach. Any feedback will be really helpful for me right now.

kishpishar · June 17, 2019, 08:46

The exact approach and the solver depends on what you want to do. If you just have a stirred tank where the gas phase is injected from outside (through a nozzle/plug/pipe), Eulerian two phase modeling is appropriate. There are a number of solvers - twoPhaseEulerFoam, multiphaseEulerFoam, reactingTwoPhase.. etc that can handle this situation.

June 11, 2019, 11:37	Bubbles injection during water mixing	#1
dpoly New Member danai Join Date: Jun 2019 Location: the Netherlands Posts: 4 Rep Power: 7	Dear All, I am new in CFD domain and first-time user of OpenFoam. I am quite experience in computational methods on structural mechanics though. I would like to ask if it is possible to simulate the air bubble formation during water mixing in OpenFoam ? I would like to hear some suggestions of what solver I could use and how to follow the bubble distribution on my domain. Thanking you in advance for the answers. Danai

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June 11, 2019, 13:42		#2
Santiago Senior Member Santiago Lopez Castano Join Date: Nov 2012 Posts: 354 Rep Power: 16	Computational mechanics is a completely different world, respect to CFD. Have in mind that, fron a mathematical point of view, structural mechanics is a "solved" issue, whereas fluid mechanics isnt. Turning back to your question: there are several approaches depending on the "kind of bubbles" you are studying, and what do you expect to get. Once you know the modelling approach, you may turn to the question of whether "OpenFOAM has it".

June 11, 2019, 14:56		#3
dpoly New Member danai Join Date: Jun 2019 Location: the Netherlands Posts: 4 Rep Power: 7	Santiago thank you for your answer and your input. I totally understand your point and I am aware of the differences. That is the reason why I turned to this forum. I mentioned my structural mechanics background in order for others to understand that I can understand the terminology of computational methods. Back to my question I will try to clarify a little bit. During stirring in a water tank, we have the formation of gas bubbles. I want to simulate he gas bubble formation, shape evolution and distribution inside my domain. I was thinking to start with a Lagrangian discrete phase model where the fluid (water) will be seen as the continuum and the disperse phase will be the gas bubbles, but I am not completely sure if that is the best approach. Any feedback will be really helpful for me right now.

June 17, 2019, 08:46		#4
kishpishar Member Kumar Join Date: Jun 2013 Posts: 47 Rep Power: 13	The exact approach and the solver depends on what you want to do. If you just have a stirred tank where the gas phase is injected from outside (through a nozzle/plug/pipe), Eulerian two phase modeling is appropriate. There are a number of solvers - twoPhaseEulerFoam, multiphaseEulerFoam, reactingTwoPhase.. etc that can handle this situation.