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how to rotate a cylinder with a angular velocity ω
Posted Feb 15, 2012, 1:57 a.m. EST Version 3.5a 1 Reply
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Hi All,
I am trying to do a analysis for a cylinder (with radius R) rotating around center axis with a angular velocity ω .
But I have no idea how to set this work in Comsol, especially how to rotate a cylinder with a angular velocity ω.
Thank you.
Best,
Hongyi
I am trying to do a analysis for a cylinder (with radius R) rotating around center axis with a angular velocity ω .
But I have no idea how to set this work in Comsol, especially how to rotate a cylinder with a angular velocity ω.
Thank you.
Best,
Hongyi
1 Reply Last Post Feb 15, 2012, 2:13 a.m. EST
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Posted:
1 decade ago
Hi
what are you lokking after the centrifugal forces and load effects ?
If so then why not leave the object fixed and rotate a virtual frame by adding a boundary load, in the radial i.e.
R=sqrt((X-X0)^2+(Y-Y0)^2)
direction (assuming a Z axis of rotation at (X0,Y0), pls adapt) then the body load is simply F=(2*pi*rpm)^2*R*rho
assuming the rotation is known as rpm (rotation per minutes, BUT expressed in seconds ! to keep it SI) and rho is the density. Note the force is a body force "density" hence units N/m^3
--
Good luck
Ivar
what are you lokking after the centrifugal forces and load effects ?
If so then why not leave the object fixed and rotate a virtual frame by adding a boundary load, in the radial i.e.
R=sqrt((X-X0)^2+(Y-Y0)^2)
direction (assuming a Z axis of rotation at (X0,Y0), pls adapt) then the body load is simply F=(2*pi*rpm)^2*R*rho
assuming the rotation is known as rpm (rotation per minutes, BUT expressed in seconds ! to keep it SI) and rho is the density. Note the force is a body force "density" hence units N/m^3
--
Good luck
Ivar