Writing expression in CFX Pre using Cell Volume

debabrata.mahapatra · July 21, 2014, 06:23

Hi,

I would like to write an expression for energy source in CFX-Pre using Cell volume. Can I write an expression as below?

Density *Volume of Finite Volumes*Cp*Delta T0

Values of Cp and Delta T0 are constants which I know apriori.

Does the variable 'volume of finite volumes' give me volume of cell?

Pls let me know.

Thanks in anticipation.

Regards,
Deb

Opaque · July 21, 2014, 08:51

Not sure what you are trying to achieve, but the source value in ANSYS CFX is the source strength per unit volume. The software will multiply by the proper volume depending of the discretization details within it.

If the source is evaluated within a fraction of the cell, the software will accommodate the correct volume; however, you may not know when the source is evaluated in the control volume or in the element.

July 21, 2014, 06:23	Writing expression in CFX Pre using Cell Volume	#1
debabrata.mahapatra New Member Join Date: Jul 2014 Posts: 2 Rep Power: 0	Hi, I would like to write an expression for energy source in CFX-Pre using Cell volume. Can I write an expression as below? Density Volume of Finite VolumesCp*Delta T0 Values of Cp and Delta T0 are constants which I know apriori. Does the variable 'volume of finite volumes' give me volume of cell? Pls let me know. Thanks in anticipation. Regards, Deb

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July 21, 2014, 08:51		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,850 Rep Power: 33	Not sure what you are trying to achieve, but the source value in ANSYS CFX is the source strength per unit volume. The software will multiply by the proper volume depending of the discretization details within it. If the source is evaluated within a fraction of the cell, the software will accommodate the correct volume; however, you may not know when the source is evaluated in the control volume or in the element.