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Forum: FLUENT March 16, 2010, 10:43
Replies: 28
Views: 9,314
Posted By Xilaf
Yes. I've just run the calculation in...

Yes. I've just run the calculation in axisymmetric space. The bubble rises 2x faster, than in planar space, but still slower, than the reality expects.
Forum: FLUENT March 16, 2010, 06:04
Replies: 28
Views: 9,314
Posted By Xilaf
Now I have a problem with the axisymetric solver....

Now I have a problem with the axisymetric solver.
The problem is in AMG solver: x-momentum, where is the divergence detected. Do you know, what's wrong?
Attached .jpg file.
Thanks
Forum: FLUENT March 16, 2010, 05:13
Replies: 28
Views: 9,314
Posted By Xilaf
I model only the situation, where Re is small and...

I model only the situation, where Re is small and the trajectory will be straight line. So I expect, that the 2D sufficient for me.
Forum: FLUENT March 16, 2010, 04:30
Replies: 28
Views: 9,314
Posted By Xilaf
Yes. I'm really new in this domain. I have to...

Yes. I'm really new in this domain. I have to study everything. Now I have atempt to Fluent, so I'm just trying to set the axisymetric solver.
Forum: FLUENT March 15, 2010, 07:53
Replies: 28
Views: 9,314
Posted By Xilaf
I understand you. I'm going to try it, but I...

I understand you. I'm going to try it, but I haven't had the approach to Fluent few days. So now I can only communicate here or study the theory...:)
Forum: FLUENT March 15, 2010, 05:55
Replies: 28
Views: 9,314
Posted By Xilaf
The infinite cylinder doesn't mean, that the...

The infinite cylinder doesn't mean, that the water column is infinity, but that the circle midhip doesn't represent the bubble but the infinite cylinder orthogonal on the 2D geometry.

I set the...
Forum: FLUENT March 15, 2010, 03:59
Replies: 28
Views: 9,314
Posted By Xilaf
I haven't tried the axi-symmetric geometry in VOF...

I haven't tried the axi-symmetric geometry in VOF model. Only a planar geometry. Do you think, it is wrong and the axi-symmetric geometry can help me to get better results?
Forum: FLUENT March 15, 2010, 03:25
Replies: 28
Views: 9,314
Posted By Xilaf
I'm not using a rice velocity. I only want to set...

I'm not using a rice velocity. I only want to set the parametres and physical properties of fluids (bubble, water) at the beginning of the bubble rising and from the results read the right rise...
Forum: FLUENT March 9, 2010, 08:27
Replies: 28
Views: 9,314
Posted By Xilaf
Bubble rise velocity in Fluent

Hi,

I simulate air bubble rise velocity in water column, in Fluent. I have a serious problem with the results:

A small bubble (d=1 mm) rises in the simulation cca 30 mm/s. It is too slow. It...
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