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Ex#3 - Integrated Quantity Boundary Conditions

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Old   July 2, 2003, 12:07
Default Ex#3 - Integrated Quantity Boundary Conditions
  #1
Vinicius
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Hi everybody!

IŽm a CFX beginner and I have a model quite similar to the example 3 shown in user function examples at printable books. But it doesnŽt clarify my questions on how to get fluid properties like temperature and density from a position (outlet Boundary Condition) and insert it into another position. I mean, I got a room wich is been cooled (transient) so I need to get an average temperature at the outlet surface and give it as a temperature at the inlet boundary condition. So the fluid goes out from domain, after that is cooled and return to domain. Does anyone know how to build that subroutine shown in that example? How can I do it without using User Function? What is the best choice to me?

Thanks!
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Old   July 2, 2003, 12:47
Default Re: Ex#3 - Integrated Quantity Boundary Conditions
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Robin
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Hi Vinicius,

You can make your inlet a function of your outlet by adding the appropriate integral CEL function. For instance, if you want the inlet temperature to be 10 percent lower than the mass averaged temperature at an outlet boundary named "Exit", simply use the following expression for the inlet temperature:

massFlowAve(T)@Exit * 0.10

Regards, Robin
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Old   July 2, 2003, 15:44
Default Re: Ex#3 - Integrated Quantity Boundary Conditions
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Vinicius
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Thanks a lot Robin!!

IŽll try it!

Best regards Vinicius
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Old   July 3, 2003, 12:38
Default Re: Ex#3 - Integrated Quantity Boundary Conditions
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Lucio
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Hi Robin, This function is very interesting! Where can I get more informations about this kind of functions? Did we have this in the CFX Printable books? Regards, Lucio
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Old   July 4, 2003, 00:09
Default Re: Ex#3 - Integrated Quantity Boundary Conditions
  #5
Neale
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Yes, look in the documentation for the CFX Expression Language. It covers all the integrated quantity functions available in the flow solver and CFX-Post.

Neale
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