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-   -   Bubbles rising in the vertical column (http://www.cfd-online.com/Forums/fluent/40954-bubbles-rising-vertical-column.html)

ravi May 13, 2006 02:42

Bubbles rising in the vertical column
 
Hi all,

I want to simulate rising bubbles with different sizes (1 mm to 10 mm) in a vertical column.

I tried single bubble different sizes using VOF method.

But for multiple bubbles i am not sure what to do????

Can any one give me some idea ?

Thanks Ravi.


mIn May 13, 2006 02:45

Re: Bubbles rising in the vertical column
 
You need to patch different regions as bubbles of different sizes.

kumar May 17, 2006 15:31

Re: Bubbles rising in the vertical column
 
i also want to simulate a single rising bubble in a vertical column.how should i do it?


ravikirananjani July 10, 2012 13:35

Hello Friends, Can anyone send me the model of Bubble rising in a vertical tube or please suggest me the boundary conditions as i am interested in simulating the rise of air bubble inside a channel where the water is flowing from the bottom. please tell me the boundary conditions.

lynx1989 September 5, 2012 05:21

Quote:

Originally Posted by ravikirananjani (Post 370679)
Hello Friends, Can anyone send me the model of Bubble rising in a vertical tube or please suggest me the boundary conditions as i am interested in simulating the rise of air bubble inside a channel where the water is flowing from the bottom. please tell me the boundary conditions.

Hi, I am a beginner of Fluent, and i am trying to similate single Taylor bubble rising in a vertical tube.
Have you made any progress yet?
Please leave me a message so that we can discuss further. Thank you~

hfsf November 20, 2012 10:22

Usually the bubble is initialized in the domain thru the insertion of a few cells with the \alpha=1. This could be doen easily using the Swak4Foam contrib, thru the funkySetFields utility. I'm working on a falling drop that transfers solute im my master, so I could help you guys a little.

Best,

hfsf

parisamp January 1, 2013 05:41

Quote:

Originally Posted by mIn
;132151
You need to patch different regions as bubbles of different sizes.

Hi all,dear min i am simulating oil droplets in water but max number of spherical patching is 15.how can i increase number of patch of different region?

hfsf January 1, 2013 08:00

Quote:

Originally Posted by hfsf (Post 393209)
Usually the bubble is initialized in the domain thru the insertion of a few cells with the \alpha=1. This could be doen easily using the Swak4Foam contrib, thru the funkySetFields utility. I'm working on a falling drop that transfers solute im my master, so I could help you guys a little.

Best,

hfsf


Oh man, what a shame. I thought I was in the OpenFOAM Forum :eek:. But in FLUENT you need to initizalize a circular register containing the phase fraction equal 1.

zobekenobe January 2, 2013 07:02

You can simulate using CFX. If you have a plate spager or its variation you can 'insert' the 'injection points' and define the velocity at each of these points. Specify the Opening as an 'outlet' with the degassing boundary condition such that it allows the air to escape while reflects the water back into the column. I initialize the column with liquid hold up as 1 and initial velocity zero everywhere. Use CFX if you wanna simulate the multiphase flows with LES and others (Fluent doesnt allow LES of Multiphase flows)..hope this suffices

Valeck February 14, 2013 11:09

Hello guys!
I work in that type of project.I succed in simulated the rise of a Taylor bubble in a vertical tube in a stagnant liquid for diameter ranging from 5 to 10 mm but below 5mm,the simulations are not conclusive.I'm trying to fix the problem

But yes,you have to patch the domain in fluent in order to generate a bubble...And you do the same for more bubbles.

PS:If you want to use less memory and time calculation,construct an horizontal tube and draw only the half diameter.In fluent,use axisymetric option and gravity in X direction.It works well

Good luck

amasoudi November 21, 2013 17:59

"How to monitor velocity of a single bubble rising in vertical column? "
 
Hi,
does anybody know how can I monitor the rising velocity of single bubble which is rising in a 2D column?


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