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-   -   Difference between facet average and area-weighted average (http://www.cfd-online.com/Forums/main/68389-difference-between-facet-average-area-weighted-average.html)

zdz198728 September 17, 2009 11:49

Difference between facet average and area-weighted average
 
Hi, guys, I have a project need to show wall temperature on wall. The area -weighted average give 500K, however, facet average give the temperature over 1000K. Could you help me to explain the difference between each other. Which one should I use?

wiebe September 18, 2009 07:36

Quote:

Originally Posted by zdz198728 (Post 229785)
Hi, guys, I have a project need to show wall temperature on wall. The area -weighted average give 500K, however, facet average give the temperature over 1000K. Could you help me to explain the difference between each other. Which one should I use?

Hi,

This depends on what you want. The 'facet average' just sums up the temperatures of all facets on your wall and divides by the number of facets, regardless of the size of these facets. the area weighted average multiplies the temperature of each facet by its area, sums everything up, and divides by the area of the wall.

In your case you probably have a hot spot on your wall with small facets, hence the difference.

Kind regards,
Wiebe.

zdz198728 September 18, 2009 13:22

Thank you very much! I think your answer helps.


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