Bubble plume simulation, multi phase flow

Artvandelay · October 8, 2013, 09:27

I'm trying to simulate a bubble plume in a water tank (cubical). My simulation is yielding results close to that determined experimentally, when my plume injection point is at the center of the cube. But when I inject from closer to the wall (to study the Wall effects), the simulation results differ from the experimental ones. Can someone tell me what additional physics I might be missing? (Do I need to fine tune certain parameters, while simulating for the wall effects?) I have adjusted the meshing to include a higher resolution near the wall.
PS: I'm not using turbulence modeling in the simulation.
Thanks in advance!

davibarreira · December 31, 2014, 08:38

Hello, I know it has been a while since you posted this, but did you manage to get the simulation working properly?Im also trying to simulate a bubble plume, but my results are not matching the experimental results. Right now Im trying to replicate the results present in the work of Dhotre and Smith (2007), entitled "CFD simulation of large-scale bubble plumes: Comparisons against experiments". My model seems to be overestimating the values of void fraction and the profile is not being a gaussian.

p.s:Im using axial symmetry.

Artvandelay · January 1, 2015, 13:55

Hey, I was actually not able to validate my results with the experimental findings. Initially I thought I got it correctly, but then I realized that there is a mismatch. While I am able to predict the structure of the plume with the one taken by the experimental one, I am not able to match the 2 structures in terms of scales. Besides I didn't use the 2 liquid model. I used eulerian-lagrangian formulation without any turbulence modeling (which is probably the reason for the mismatch). I did not use axial symmetry. So, sorry for that.

davibarreira · January 1, 2015, 17:11

Thanks for your reply!

Saugata · May 5, 2017, 05:42

Sir, I am simulating bubble plume condition using Eulerian model. I find, air velocity just some distance after the injector is very high. For rest of the domain, it is matching test data. I am injecting air at a velocity of 0.05 M/Sec. However, I get air/water velocity as high as 2.5 M/Sec immediately after injection point. Can you help me with your definition file in Fluent or take my setup to review and provide some suggestion.

soheil_r7 · August 23, 2018, 03:52

Hi,

Would you please tell me how did you manage to "inject air" in fluent?
There is one injection option in Discrete Phase section, with injection types of single, cone, etc.
I am trying to inject some liquid inside a tank [Link], and wondering is this the only way?

Thanks,
Regards

October 8, 2013, 09:27	Bubble plume simulation, multi phase flow	#1
Artvandelay New Member Dinanath Sharma Join Date: Aug 2013 Location: India Posts: 10 Rep Power: 12	I'm trying to simulate a bubble plume in a water tank (cubical). My simulation is yielding results close to that determined experimentally, when my plume injection point is at the center of the cube. But when I inject from closer to the wall (to study the Wall effects), the simulation results differ from the experimental ones. Can someone tell me what additional physics I might be missing? (Do I need to fine tune certain parameters, while simulating for the wall effects?) I have adjusted the meshing to include a higher resolution near the wall. PS: I'm not using turbulence modeling in the simulation. Thanks in advance! Last edited by Artvandelay; October 8, 2013 at 09:34. Reason: Forgot to add a point

December 31, 2014, 08:38		#2
davibarreira Member Davi Barreira Join Date: Apr 2014 Location: Fortaleza Posts: 76 Rep Power: 12	Hello, I know it has been a while since you posted this, but did you manage to get the simulation working properly?Im also trying to simulate a bubble plume, but my results are not matching the experimental results. Right now Im trying to replicate the results present in the work of Dhotre and Smith (2007), entitled "CFD simulation of large-scale bubble plumes: Comparisons against experiments". My model seems to be overestimating the values of void fraction and the profile is not being a gaussian. p.s:Im using axial symmetry. farzadpolytechnic likes this.

January 1, 2015, 13:55		#3
Artvandelay New Member Dinanath Sharma Join Date: Aug 2013 Location: India Posts: 10 Rep Power: 12	Hey, I was actually not able to validate my results with the experimental findings. Initially I thought I got it correctly, but then I realized that there is a mismatch. While I am able to predict the structure of the plume with the one taken by the experimental one, I am not able to match the 2 structures in terms of scales. Besides I didn't use the 2 liquid model. I used eulerian-lagrangian formulation without any turbulence modeling (which is probably the reason for the mismatch). I did not use axial symmetry. So, sorry for that. farzadpolytechnic likes this.

May 5, 2017, 05:42	Need Your Support	#5
Saugata New Member Saugata Dutta Roy Join Date: May 2011 Posts: 1 Rep Power: 0	Sir, I am simulating bubble plume condition using Eulerian model. I find, air velocity just some distance after the injector is very high. For rest of the domain, it is matching test data. I am injecting air at a velocity of 0.05 M/Sec. However, I get air/water velocity as high as 2.5 M/Sec immediately after injection point. Can you help me with your definition file in Fluent or take my setup to review and provide some suggestion.

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January 1, 2015, 17:11		#4
davibarreira Member Davi Barreira Join Date: Apr 2014 Location: Fortaleza Posts: 76 Rep Power: 12	Thanks for your reply!

August 23, 2018, 03:52		#6
soheil_r7 New Member Soheil Join Date: Mar 2014 Location: Helsinki Posts: 21 Rep Power: 12	Hi, Would you please tell me how did you manage to "inject air" in fluent? There is one injection option in Discrete Phase section, with injection types of single, cone, etc. I am trying to inject some liquid inside a tank [Link], and wondering is this the only way? Thanks, Regards