How to resolve negative torque values for a VAWT in Ansys Fluent?

khadija8 · April 13, 2020, 07:55

Hello,
I am working on the vertical axis water turbine project. after the computations, the average Monitors value I got was a negative value. This would suggest a negative torque value which is clearly wrong, I do not know the exact reason for this . I am getting negative moment values when I put moment center as (0 0 0) and moment axis as (0 0 1). but I get the positive moment when I put (0 0 -1) direction.
I would really appreciate any help you can offer.
Thanks

vinerm · April 13, 2020, 08:59

The sign of torque is pointing towards its rotation direction. If you are expecting it to be positive about (0 0 1), then it should be rotating in CCW direction.

April 13, 2020, 07:55	How to resolve negative torque values for a VAWT in Ansys Fluent?	#1
khadija8 New Member khadija rahal Join Date: Dec 2014 Location: tunisia Posts: 15 Rep Power: 12	Hello, I am working on the vertical axis water turbine project. after the computations, the average Monitors value I got was a negative value. This would suggest a negative torque value which is clearly wrong, I do not know the exact reason for this . I am getting negative moment values when I put moment center as (0 0 0) and moment axis as (0 0 1). but I get the positive moment when I put (0 0 -1) direction. I would really appreciate any help you can offer. Thanks

April 13, 2020, 08:59	Torque	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	The sign of torque is pointing towards its rotation direction. If you are expecting it to be positive about (0 0 1), then it should be rotating in CCW direction. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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