# free surfaces and two phase

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 May 10, 2005, 00:26 free surfaces and two phase #1 Arnie Guest   Posts: n/a Hi, I am a novice in using PHOENICS. I want to know how to model free surfaces i.e., whether PHOENICS has any interface tracking method and if not then what is the way out in such cases. My second problem is regarding multiphase flow involving phase change. Does PHOENICS have good models to perform such simulations? Thanks in advance Arnie.

 May 11, 2005, 01:54 Re: free surfaces and two phase #2 Arnie Guest   Posts: n/a Is there nobody to answer this question?

 May 12, 2005, 12:27 Re: free surfaces and two phase #3 Clark Guest   Posts: n/a Hi, PHOENICS has SEM and VOL models for free surface modelling, and you may have already seen this in the manual. If you haven't tried those models. I recommand you to follow the library cases.

 May 17, 2005, 07:46 Re: free surfaces and two phase #4 Mick Hughes Guest   Posts: n/a SEM and HOL are two. I would advise avoiding using something as complicated as IPSA if possible. GENTRA also exists for particle tracking. You can check up on these methods in POLIS For many two phase flows we can often solve as one phase, by introducing and solving for a concentration variable then using proportions/mass fractions to calculate the properties such as density etc. PHASE change is not automatically active in PHOENICS, but can be incorporated through ground coding. Its been done quite a lot.

 May 19, 2005, 00:40 Re: free surfaces and two phase #5 Arnie Guest   Posts: n/a Hi Mick, Actually my problem involves boiling and condensation. I did not get what actually do you mean by ground coding? I am using Phoenics 3.6.

 May 19, 2005, 09:45 Re: free surfaces and two phase #6 Mick Hughes Guest   Posts: n/a By ground coding I mean putting the physics via FORTRAN coding into PHOENICS through the file ground.f. This file allows the user to add or modify PHOENICS at stages of the solution cycle. Typically researchers would add their physics in here if it did not already exist. I have never done boiling/condensation. I was hoping you were going to say liquid/solid. My first though would be to search the library cases for anything containing boiling or condensation. try searching through \phoenics\d_utils\d_libs for boil or condensation. But maybe you can dream up something simpler by using a concentration variable, say, c1 to represent the liquid. If you know an evaporation rate then you could apply a sink of c1 as the liquid evaporates along with a sink of mass. If it was solid/liquid I could just give you some code, but I am not entirely sure liquid/gas. Someone out there must have thought about this???......anyone

 May 20, 2005, 07:20 Re: free surfaces and two phase #7 Arnie Guest   Posts: n/a Thanks Mick, I'll try up on what u suggested. Lookin fwd to more support whenever needed. Regards Arnie

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