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Old   June 2, 2006, 07:26
Default fluid fluid Interface
  #1
macdidi
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Hello I'm modelling a flow in two connected fluids domain, but in the interface I don't like to have consrvative masse flux condition, just heat transfer condition. Is it possibl in CFX?
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Old   June 5, 2006, 11:54
Default Re: fluid fluid Interface
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Robin
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Are you trying to model CHT through a thin surface?
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Old   June 6, 2006, 03:12
Default Re: fluid fluid Interface
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macdidi
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No But CHT is used when you have solid domaine in your simulation, but in my case I've just fluid domains. Any suggestions?
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Old   June 6, 2006, 09:48
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Robin
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What is preventing the fluid from flowing, but allowing heat. What are you trying to model?

-Robin
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Old   June 6, 2006, 09:52
Default Re: fluid fluid Interface
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macdidi
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So i've I've a vessel filled with watre (fluide ) and inside a fruit juice in a plastic envelope. But the thikness of enveloppe is too small, so i've just to mconsider fluid fluid interface:

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Old   June 6, 2006, 10:00
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Robin
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So... you are trying to model CHT through a thin surface!

You cannot currently do this in CFX without some thickness to the solid.

Regards, Robin
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Old   June 6, 2006, 10:10
Default Re: fluid fluid Interface
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macdidi
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OK THANKS BUT IS THERE MINMUM THIKNESS IN CFX
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Old   June 6, 2006, 10:27
Default Re: fluid fluid Interface
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Robin
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No there isn't, although you might run into round off issues if you use the actual thickness (resolved by running double precision).

Just make it thicker and calculate an appropriate k to represent the conduction.

-Robin
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