Bubble rise velocity
 

Hi,

I am studying behavior of a large air bubble rising in water. How I can get rise velocity from Function Calculator?

I have two ideas:

1.- Create a isovolume at air volume fraction between 0 and 1, and use function VolumeAve with air velocity as variable.

2.- Create a isosurface at air volume fraction = 0.5, and use function AreaAve with air velocity as variable.

I get different results from two ways. What is the right option? Do you have some new idea?

Thanks in advance Miguel

Re: Bubble rise velocity
 

Hi Miguel, The bubble-water interface has to be very refined as you understand. There are couple of questions before answering your query:

1) Is it unsteady or steady? 2) 2D or 3D? 3) Is the solution grid independent?

hasan.khanCFD@gmail.com