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-   -   definition of moment coefficient (http://www.cfd-online.com/Forums/fluent/62998-definition-moment-coefficient.html)

khunpae March 25, 2009 10:55

definition of moment coefficient
 
hi all,

Could anybody tell me what is definition of moment coefficient (Cm) in Fluent?

thank in advance

martingariepy March 25, 2009 20:05

Check chapter 22, reporting alphanumeric data. There is you're formula you looking for

khunpae March 25, 2009 21:54

Quote:

Originally Posted by martingariepy (Post 210861)
Check chapter 22, reporting alphanumeric data. There is you're formula you looking for

Thank you. I have already found it.

khunpae March 28, 2009 23:34

Relate to moment coeffcient, we must choose correct reference values. I am using 2D model. Could anybody tell me how to choose correct these values?
Cm = \frac{M}{\frac{1}{2}\rho v^{2}AL}
So, in 2D problem, unit of these quantities are such as M [N], \rho [kg/m^{3}], v [m/s], A [m^{2}], L [m], correct?
For example: a rectangular with dimension WxH = 0.3 x 0.1m, rolling on calm water surface level 1.5m. What I should choose reference values for v, L, A...?

aalisha June 2, 2014 02:23

Reference values
 
Hello,

if anyone can tell me , whether we need to change the reference values before starting the iterations in fluent.

The reference values which are already visible has the density of air while I am working for water as a medium.

It will be a great help if anyone of you can guide me in this. Thanks :)


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