definition of moment coefficient

khunpae · March 25, 2009, 09:55

hi all,

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

thank in advance

martingariepy · March 25, 2009, 19:05

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

khunpae · March 25, 2009, 20:54

Quote:

Originally Posted by martingariepy

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, 22:34

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

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

March 25, 2009, 09:55	definition of moment coefficient	#1
khunpae New Member anonymous Join Date: Mar 2009 Posts: 3 Rep Power: 17	hi all, Could anybody tell me what is definition of moment coefficient (Cm) in Fluent? thank in advance

June 2, 2014, 02:23	Reference values	#5
aalisha New Member Aalisha Join Date: Jan 2014 Posts: 18 Rep Power: 12	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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March 25, 2009, 19:05		#2
martingariepy New Member Martin Gariepy Join Date: Mar 2009 Location: Laval Posts: 13 Rep Power: 17	Check chapter 22, reporting alphanumeric data. There is you're formula you looking for

March 28, 2009, 22:34		#4
khunpae New Member anonymous Join Date: Mar 2009 Posts: 3 Rep Power: 17	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...?