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-   -   moment defining (http://www.cfd-online.com/Forums/fluent/95745-moment-defining.html)

mht December 31, 2011 02:53

moment defining
 
hello everyone:
I want to know how Fluent define the Moment Coefficient, Was it defined as: cm=M/(0.5*density*v*v)? or someelse form.

thanks a lot!

duri December 31, 2011 05:41

cm=M/(0.5*density*area*length*V*V), all taken from reference values.

mht January 3, 2012 21:12

Duri,thanks for your attention
now,I have known that cm=M/(0.5*density*area*length*V*V), and all taken from reference values. I also use Fluent Function compute_force_and_moment to get the moment,then i used the moment to get cm, I found that this cm was diffenent from the Monitors-Force-CM, Could you tell me why?

duri January 4, 2012 12:29

It will be same. Check moment origin, axis etc.

mht January 5, 2012 03:18

I think i have misused this function, could you give me a UDF that contains this function, thank you very much!


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