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March 22, 2015, 11:53 |
Starccm+ yaw test function
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#1 |
New Member
Harshal
Join Date: May 2014
Posts: 14
Rep Power: 11 |
Hello
I am trying to perform a yaw test on ship so i created the yaw test function to use in the Motion 'Rotation and translation'. But when i create a vector function and put that in rotation rate in 'Rotaion and translation' i get error "Function does not evaluate to a scalar: Simulation>MotionManager>RotatingAndTranslatingMot ion("Rotation and Translation")>ScalarPhysicalQuantity>InlineFieldFu nction("InlineFieldFunction")" it does work wen i define function as scalar. can any one explain me the reason ? as as angular vel. is vector it should work with vector function. Thnx |
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March 22, 2015, 14:45 |
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#2 |
New Member
Tim Meier
Join Date: Mar 2015
Posts: 16
Rep Power: 11 |
The rotation rate is a scalar value, so a vector function doesnīt make sense. Thatīs the reason why the function, defined as scalar, is working.
The angular velocity (units 1/s) describes the rotation rate around an origin (and the direction of rotation, meaning clockwise or counter clockwise). It is a pseudovector quantity. So what you are looking for, is maybe a coordinate system that is moving to describe the changing rotation position. |
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March 23, 2015, 23:54 |
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#3 |
Senior Member
Matt
Join Date: Aug 2014
Posts: 947
Rep Power: 17 |
True, the input is a scalar, but velocity is always defined as a vector. There should be an input for a vector that defines a rotational axis and then a scalar to define magnitude. I think you are just over complicating the issue.
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