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The formula to compute the mass flow averaged value in a surface

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Old   September 7, 2013, 17:56
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I ask for the reference because I use CFX-post to compute volume and I need to refer it and put the volume calculating formula on my thesis. Where could I find it?

And what is the formula to compute the surface averaged heat flux?
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Where could I find the documentation?
You're writing a thesis involving numerical simulation. You're already at the post-processing step. And you don't know about the software documentation? How did you pick the models you used?

You can find the documentation by opening the CFX-Launcher and going to 'Help > CFX > Index'. Another option is through the Start Menu (Windows), on 'Start > ANSYS XX.X > Help > ANSYS XX.X Help', where XX.X is the ANSYS version you have installed.
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Old   September 8, 2013, 09:22
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In the Ansys theory or solver modelling guide !
I spent quite some time to look for them but didn't find out. Are you sure they are there?
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Old   September 8, 2013, 09:50
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I spent quite some time to look for them but didn't find out. Are you sure they are there?
There are a few other guides. Check them all. I have personally seen the definitions in one of the guides.

Anyway I agree with Bruno's post above. By now you should be a little familiar with the guides especially as they contain the theory for most of the questions that you ask here. :-)
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Old   September 8, 2013, 11:07
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Originally Posted by RicochetJ View Post
There are a few other guides. Check them all. I have personally seen the definitions in one of the guides.

Anyway I agree with Bruno's post above. By now you should be a little familiar with the guides especially as they contain the theory for most of the questions that you ask here. :-)
The modelings are well discussed in the guides. But I didn't find the formula telling how CFX does the averaging.
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Old   September 8, 2013, 11:07
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Originally Posted by brunoc View Post
You're writing a thesis involving numerical simulation. You're already at the post-processing step. And you don't know about the software documentation? How did you pick the models you used?

You can find the documentation by opening the CFX-Launcher and going to 'Help > CFX > Index'. Another option is through the Start Menu (Windows), on 'Start > ANSYS XX.X > Help > ANSYS XX.X Help', where XX.X is the ANSYS version you have installed.
The modelings are well discussed in the guides. But I didn't find the formula telling how CFX does the averaging.
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Old   September 9, 2013, 04:42
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These links do not work now. Where could I find the documentation?
And what is the formula to compute the surface averaged heat flux?
Have a look in the documentation here:

CFX:
// Reference Guide // 14. Functions in ANSYS CFX // 14.5. Quantitative Function List // 14.5.16. massFlowAve

FLUENT:
// Theory Guide :: 0 // 22. Reporting Alphanumeric Data // 22.3. Surface Integration // 22.3.1. Computing Surface Integrals

Understand that the definitions like "area/flow averaged quantity" are generic and hence, in those cases, the documentation for FLUENT is applicable to CFX.

Quote:
By the way, how does CFX calculate the volume of the fluid domain? Just sum up all the cells size in the fluid domain?
Yes, see section 14.5.29.2.
// Reference Guide // 14. Functions in ANSYS CFX // 14.5. Quantitative Function List // 14.5.29. volume

The links are for ANSYS 14.5 products.

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