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Old   June 7, 2007, 09:02
Default Two-phase flow
  #1
mvee
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Hi, I have two questions:

1. Is that possible with fluent to carry out simulation for two-phase flow in annular, slug, plug, wispy annular and mist regime? Is there any tutorial for the same?

2. I want to know that fully developed flow can be defined at the inlet only through UDF? or is there any other way to define fully developed flow? Because if i start the simulation in normal way then it will require large fully developed length. So, how can i reduce fully developed length in two-phase flow?

thanking you and have a nice day
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Old   June 7, 2007, 09:42
Default Re: Two-phase flow
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AAS
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2. You can run a simulation on a sufficiently long representative geometry until you get fully developed flow and write the velocity profile (write BC). You can use that saved profile for your real geometry inlet(read BC).
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Old   June 8, 2007, 00:04
Default Re: Two-phase flow
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mvee
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I thought that this is posible for single phase flow or can it be applied to two-phase also? Why i am asking this because due to presence of another phase the velocity profile in the pipe gets changed. So writing the fully developed velocity profile and applying to real geometry can solve my problem?, AAS

Thanks a lot AAS

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Old   June 8, 2007, 16:29
Default Re: Two-phase flow
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A A S
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I have used this in the discrete phase model. I write the profile for fully developed flow and then read profile in my actual case for the inlet. This has helped stabilize a very sensitive reacting flow solution. I am not certain it applies the same for multi-phase with large volume fraction of second phase.

good luck AAS
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Old   June 9, 2007, 00:57
Default Re: Two-phase flow
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mvee
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Thanks for your reply. If i find the solution then definately will come to you. You please also find the answer then reply me

thanks once again AAS
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Old   June 19, 2007, 08:18
Default Re: Two-phase flow
  #6
selim
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We can not solve condensation of R134a in a pipe with Fluent, CFX, CF-Design programs. I could not find any article in citation index about condensation (two phase flow problem) solution with any program. Our university is ready to pay its fee for solution...
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Old   June 25, 2007, 06:39
Default Re: Two-phase flow
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mehdi atapour
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Hello I want to model two phase flow in a laval nazzl. Please help me. Yours truly mehdi atapour
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