Rotating Mesh around Local Axis

GPan1 · November 9, 2012, 18:35

Hi,

I'm running some external aerodynamic CFD studies on a Formula Student car as part of my thesis, and I want to simulate wheel movement. However, since the wheels are not perpendicular to the ground, they have some camber and toe angles, I cannot rotate them around the y axis, so how would I go about defining an axis aligned with the wheel orientation. I do not know how hard this would be to implement as I am just starting out using OpenFOAM.

regards.

GPan1 · November 13, 2012, 04:29

so I did some digging and found the rotateMesh command, and if I read the documentation correctly, I would split my mesh into 5 parts - 4 wheels and the body. Then use rotateMesh (initial orientation where 1 = 90deg?) (final orienation) -time :1000

which should rotate the wheel till t=1000?

GPan1 · November 21, 2012, 04:07

figured it out, you split the mesh into 5 parts, wheels and body. Then use a rotatingWallVelocity boundary conditions for them. However, the axis is labelled as

axis (0 0 1);

Which would rotate about the z axis, if I used (0.5 0.5 0); instead (or is this just a simple 1 is on, 0 is off), would that rotate the mesh 45 degrees to the x and y axis then?

If so, and I wanted to say turn the wheels 25 degrees and run them, I'd have it (0.278 0.722 0), although probably best picking something that divides into 90 better.

November 9, 2012, 18:35	Rotating Mesh around Local Axis	#1
GPan1 New Member Join Date: Nov 2012 Location: Scotland, UK Posts: 19 Rep Power: 6	Hi, I'm running some external aerodynamic CFD studies on a Formula Student car as part of my thesis, and I want to simulate wheel movement. However, since the wheels are not perpendicular to the ground, they have some camber and toe angles, I cannot rotate them around the y axis, so how would I go about defining an axis aligned with the wheel orientation. I do not know how hard this would be to implement as I am just starting out using OpenFOAM. regards.

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November 13, 2012, 04:29		#2
GPan1 New Member Join Date: Nov 2012 Location: Scotland, UK Posts: 19 Rep Power: 6	so I did some digging and found the rotateMesh command, and if I read the documentation correctly, I would split my mesh into 5 parts - 4 wheels and the body. Then use rotateMesh (initial orientation where 1 = 90deg?) (final orienation) -time :1000 which should rotate the wheel till t=1000?

November 21, 2012, 04:07		#3
GPan1 New Member Join Date: Nov 2012 Location: Scotland, UK Posts: 19 Rep Power: 6	figured it out, you split the mesh into 5 parts, wheels and body. Then use a rotatingWallVelocity boundary conditions for them. However, the axis is labelled as axis (0 0 1); Which would rotate about the z axis, if I used (0.5 0.5 0); instead (or is this just a simple 1 is on, 0 is off), would that rotate the mesh 45 degrees to the x and y axis then? If so, and I wanted to say turn the wheels 25 degrees and run them, I'd have it (0.278 0.722 0), although probably best picking something that divides into 90 better.