How to see trajectory of a bubble?

Matiasi · June 2, 2015, 12:37

Hi everyone

I simulated air bubble in water 3D, I used VOF model, air velocity inlet, and pressure outlet, also other things.
i want to see trajectory of bubble, how I can do it?

I think that i have few options.

-Track particle, I have read about it, but I havent learnt enough to do it, if this is the right way to do it, can you help me?
-animate, my problem with this, is that I have a 3D model and I see volume of fraction, so the water not allow me see the bubble, maybe there is a way
to see only the air phase and contour.??
-I used pathline, but this only show the trajectory of a non-mass particle at current timestep (i have understanding), i want to see trajectory of a bubble in a period of time (since formation until bubble arrive at free surface)

someone can help me??
maybe exist another way?

best regards

Diksha Agarwal · March 4, 2018, 08:40

Did you get the solution to this problem? If yes, could you please help me? I am having the same doubt.

CeesH · March 5, 2018, 05:38

Getting the trajectory in FLUENT directly is not possible - if you have a single bubble, however, it's relatively straightforward to get the center of mass. You can do that using a UDF that computes the center of mass from the phase-fields, and stores the coordinates in (for example) a text file that you can open in excel, matlab or another program of your liking. Alternatively, store the phase-field every timestep (or X timesteps) and get the center of mass in post-processing, such as MATLAB.

June 2, 2015, 12:37	How to see trajectory of a bubble?	#1
Matiasi New Member matias Join Date: Jun 2015 Posts: 7 Rep Power: 10	Hi everyone I simulated air bubble in water 3D, I used VOF model, air velocity inlet, and pressure outlet, also other things. i want to see trajectory of bubble, how I can do it? I think that i have few options. -Track particle, I have read about it, but I havent learnt enough to do it, if this is the right way to do it, can you help me? -animate, my problem with this, is that I have a 3D model and I see volume of fraction, so the water not allow me see the bubble, maybe there is a way to see only the air phase and contour.?? -I used pathline, but this only show the trajectory of a non-mass particle at current timestep (i have understanding), i want to see trajectory of a bubble in a period of time (since formation until bubble arrive at free surface) someone can help me?? maybe exist another way? best regards

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March 4, 2018, 08:40		#2
Diksha Agarwal New Member Diksha Agarwal Join Date: Mar 2018 Posts: 1 Rep Power: 0	Did you get the solution to this problem? If yes, could you please help me? I am having the same doubt.

March 5, 2018, 05:38		#3
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	Getting the trajectory in FLUENT directly is not possible - if you have a single bubble, however, it's relatively straightforward to get the center of mass. You can do that using a UDF that computes the center of mass from the phase-fields, and stores the coordinates in (for example) a text file that you can open in excel, matlab or another program of your liking. Alternatively, store the phase-field every timestep (or X timesteps) and get the center of mass in post-processing, such as MATLAB.