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Graduation September 29, 2011 10:05

Cryogenic boiling: CFX or FLUENT
 
I am going to try to simulate boiling of a cryogenic liquid in an upflow through annulus tubes for my graduation prjocect. In this company we have both CFX and FLUENT available but the majority of my collegues have experience in CFX. Now is my question which software package handels boiling good. What are the positive and negative points of these programs?

cfdsolver September 29, 2011 18:02

I can't say much for FLUENT, but I can say that this is not a particularly easy problem to do in CFX. It can be done, and I have done many VOF/Multiphase simulations in CFX. I would say the most important aspect to performing this simulation is a good mesh, especially in the region where you expect the free surface interface to reside. If you are expecting a moving free surface boundary, you will need a giant, well refined mesh to accurately capture the interface movement. I would suggest using a two species single fluid model, instead of using two fluid models with mass transfer.

Graduation September 30, 2011 02:30

Quote:

Originally Posted by cfdsolver (Post 326145)
I can't say much for FLUENT, but I can say that this is not a particularly easy problem to do in CFX. It can be done, and I have done many VOF/Multiphase simulations in CFX. I would say the most important aspect to performing this simulation is a good mesh, especially in the region where you expect the free surface interface to reside. If you are expecting a moving free surface boundary, you will need a giant, well refined mesh to accurately capture the interface movement. I would suggest using a two species single fluid model, instead of using two fluid models with mass transfer.

Thanks for your reaction. Since my problem will be stationary; boiling start at a fixed position and complete evaporation at a fixed position, both yet unknown, this might give eproblems with moving interfaces.

In the meanwhile I found some information of a cavitation like model. Can this be the solution to my problem?


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