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.

You need to patch different regions as bubbles of different sizes.

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

[ravikirananjani]

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]

Originally Posted by ravikirananjani

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]

Usually the bubble is initialized in the domain thru the insertion of a few cells with the . 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]

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]

Originally Posted by hfsf

Usually the bubble is initialized in the domain thru the insertion of a few cells with the . 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 . But in FLUENT you need to initizalize a circular register containing the phase fraction equal 1.

[zobekenobe]

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]

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]

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