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Old   October 20, 2014, 03:53
Default Constant temperature in a domain
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Hi
I want to constrain a region in my domain by fixed temperature in CFX as we can do it in Fluent.
a sub-domain in CFX is defined by a heat flux. Also if we use the isothermal through the heat transfer options in a domain, interface heat flux will not be available between interfaces.

Your suggestions would be highly appreciated.
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Old   October 20, 2014, 05:26
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Glenn Horrocks
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If it is a boundary then just use the specified temperature boundary condition. If you want to constrain a volume then use a energy source term.

I do not understand your second sentence. The isothermal model means constant temperature so no heat transfer takes place - so no thermal model is required. That is why the interface heat flux option is not available.
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Old   October 20, 2014, 07:23
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Quote:
Originally Posted by ghorrocks View Post
If it is a boundary then just use the specified temperature boundary condition. If you want to constrain a volume then use a energy source term.

I do not understand your second sentence. The isothermal model means constant temperature so no heat transfer takes place - so no thermal model is required. That is why the interface heat flux option is not available.
Thank you for your comments. I want to constarin a volume by fixed temperature. I defined a energy source via subdomain but only heat flux source option is available and not temperature.
I would like to know whether is there any option for fixed temperature in CFX like what is availabe in fluent through (Cell Zone Conditions>Fixed Values> Temperature).
Thank you in advance
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Old   October 20, 2014, 17:18
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Yes, using a source term. Source terms do not have to add/subtract a constant flux, they can be more devious than that so they can be set to force the local temperature to a fixed value.

Set the CFX documentation section 1.3.2.2.2 on "General Momentum Source" for how to specify a fixed value in a region. This discusses the momentum equation, but can be applied to any equation.
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