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difference between ‘volume’ and ‘volume of finite volumes’ in cfx |
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#1 |
Member
phd
Join Date: Oct 2013
Posts: 76
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Hi, there,
When I export the data from .res in CFX-post, I have noticed that there is discrepancy between ‘volume’ and ‘volume of finite volumes’ in cfx. But I didn’t find the definitions of these two variables in the open documents. May I know why these two variables are different? More specifically, I’d like to know when the volumetric quantities are used, which kind of volume are used? When the volume integral are used which kind of volume are used? Thank you very much! ![]() |
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#2 |
Senior Member
Join Date: Jun 2009
Posts: 1,880
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the answer is "depends".
If you are doing an integral where the elemental volume refers to the control volume, i.e integral over the volume (integrand) dV = Sum of (integrand at node * Volume of control volume) However, if the elemental volume refers to the element, integral over the volume (integrand) dV = Sum of (integrand at the element * volume of the element) For certain Global Sum (volume elements) = Global Sum (control volume volumes) It depends on how you want to evaluate the specific integral. Control volume volume = Sum of (sector volumes around a node) Hope the above helps |
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#3 |
Member
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13 ![]() |
Thank you, Opaque!
Do you mean: in CFX-Post 'volume' is the elemental volume; 'volume of finite volumes' is the Sum of (sector volumes around a node)? |
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