Starccm+ yaw test function

harshalh · March 22, 2015, 10:53

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

TimCFD · March 22, 2015, 13:45

The rotation rate is a scalar value, so a vector function doesn´t make sense. That´s 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.

fluid23 · March 23, 2015, 22:54

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.

March 22, 2015, 10:53	Starccm+ yaw test function	#1
harshalh 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, 13:45		#2
TimCFD New Member Tim Meier Join Date: Mar 2015 Posts: 16 Rep Power: 11	The rotation rate is a scalar value, so a vector function doesn´t make sense. That´s 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.

March 23, 2015, 22:54		#3
fluid23 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.