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Forum: STAR-CCM+

June 11, 2012, 09:28

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Hi, It doesn't work when I put the velcoity...

Hi,

It doesn't work when I put the velcoity condition fuction of the volume fraction of water and I don't know why. Have a look to this figure...

There you will see where I define the velocity...

Forum: STAR-CCM+

June 8, 2012, 11:22

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Hi, Regardign the velocity, how I can just...

Hi,

Regardign the velocity, how I can just define the velocity distribution as:

If water volume fraction is 1---> Vel=2 m/s , else---> Vel=0.5 m/s

I mean how I can write that in a field...

Forum: STAR-CCM+

June 6, 2012, 09:06

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Thank you for the help with the velocity, I have...

Thank you for the help with the velocity, I have also another question. I need to monitor: 1) the length of the slug bubbles and 2) the liquid film thinness (between the bottom of the tube and the...

Forum: STAR-CCM+

May 30, 2012, 09:07

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Hi, I defined two field functions for the void...

Hi, I defined two field functions for the void fraction of water and air:

water = ($$Centroid[1]<0)?1:0
air = 1-$Water

but I don't know how to define the velocity vector in direction (i). I...

Forum: STAR-CCM+

May 23, 2012, 08:26

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Hi, I have an horizontal pipe with ID of 5...

Hi,

I have an horizontal pipe with ID of 5 cm and a length of 30 m. I defined and inlet (velocity inlet) and outlet (pressure outlet). I am not familiar with field functions and I don't have...

Forum: STAR-CCM+

August 30, 2011, 02:52

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

My vertical tube has a diameter of 2.53 cm and 4...

My vertical tube has a diameter of 2.53 cm and 4 m length, due to symemtry I am modelling just half of it.

In CCM+ I can not define a single inlet (I think) with air and water coming together...

Forum: STAR-CCM+

August 25, 2011, 04:40

Replies: 20

Two-phase flow in vertical pipe

Views: 11,367

Posted By niriosrat

Hi, Did you model slug flow? it is because I...

Hi,

Did you model slug flow? it is because I am trying to model slug flow, but is not working, so I wonder which conditions did you used on the VOF?

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