|February 6, 2013, 17:01||
Sign convention when computing moments
Join Date: Mar 2011
Posts: 35Rep Power: 6
I would like to have more information about sign conventions in ANSYS Fluent regarding moments along an axis.
I am working on a vertical axis wind turbine, rotating along the Y axis. I'm using the Rotating Reference Frame approach (steady-state simulations). I used the right hand rule to determine the rotational velocity of the rotor: the rotation-axis direction is X=0;Y=1;Z=0 and I set a positive rotational velocity. After analysing the results, I am sure that the turbine is rotating in the correct direction. But, when I report the moment of the rotor along the +Y axis (I set the moment axis at X=0;Y=1;Z=0 in the Force Reports window), I get a negative value.
So my question is : What is the sign convention in Fluent when computing moments along a given axis? I would like to be sure that I misunderstood a sign convention before drawing any conclusions. Or does Fluent compute moments applied by the rotor on the fluid ???
|moments, sign convention, vawt wind turbine|
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