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-   -   The formula to compute the mass flow averaged value in a surface (https://www.cfd-online.com/Forums/cfx/122278-formula-compute-mass-flow-averaged-value-surface.html)

brunoc September 7, 2013 17:56
Quote:
Originally Posted by Anna Tian (Post 450332)
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?
Quote:
Originally Posted by Anna Tian (Post 450335)
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.

Anna Tian September 8, 2013 09:22
Quote:
Originally Posted by RicochetJ (Post 450404)
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?

JuPa September 8, 2013 09:50
Quote:
Originally Posted by Anna Tian (Post 450485)
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. :-)

Anna Tian September 8, 2013 11:07
Quote:
Originally Posted by RicochetJ (Post 450495)
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.

Anna Tian September 8, 2013 11:07
Quote:
Originally Posted by brunoc (Post 450436)
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.

oj.bulmer September 9, 2013 04:42
Quote:
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.

OJ


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