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3D rotating disc problem
Posted 26 déc. 2013, 02:38 UTC−5 Geometry Version 4.2 1 Reply
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Hi
I want to a 3D rotating disc simulation in COMSOL 4.2 ver.
How can I do this simulation?
For example, I want to rotate a disc about 1000 RPM.
At 'Initial Values' in 'Solid Mechanics(solid)', the velocity field is a 'ROTATING' velocity ? Maybe... velocity field is equal to '((rpm/60)*radius*(2*pi))' ? (unit = m/s)
Or 'Prescribed Velocity' in 'Solid Mechanics(solid)', the prescribed in y(or x) direction is a 'ROTATING' velocity ? (unit = m/s)
In brief , if I decide some velocity value(m/s) for initial value or prescribed velocity, then its rotating motion is 'REALLY' rotating in 3D space ?
Thank you.
I want to a 3D rotating disc simulation in COMSOL 4.2 ver.
How can I do this simulation?
For example, I want to rotate a disc about 1000 RPM.
At 'Initial Values' in 'Solid Mechanics(solid)', the velocity field is a 'ROTATING' velocity ? Maybe... velocity field is equal to '((rpm/60)*radius*(2*pi))' ? (unit = m/s)
Or 'Prescribed Velocity' in 'Solid Mechanics(solid)', the prescribed in y(or x) direction is a 'ROTATING' velocity ? (unit = m/s)
In brief , if I decide some velocity value(m/s) for initial value or prescribed velocity, then its rotating motion is 'REALLY' rotating in 3D space ?
Thank you.
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1 Reply Last Post 3 janv. 2014, 02:39 UTC−5
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Posted:
1 decade ago
Hi
I have struggled with this problem a while ago. I started with the Model Library model "Rotating disk" in CFD package. The problem which I ran into was that at high rotating speeds the solution did not converge, and the limiting current was not linear with the sqrt(omega). In the latest version 4.4a the solvers have apparently been improved so that I almost had it right, but only at moderately low rotating speeds.
Meshing is the most crucial issue here, and the results I obtained varied enormously (100%) when trying different meshes.
I have struggled with this problem a while ago. I started with the Model Library model "Rotating disk" in CFD package. The problem which I ran into was that at high rotating speeds the solution did not converge, and the limiting current was not linear with the sqrt(omega). In the latest version 4.4a the solvers have apparently been improved so that I almost had it right, but only at moderately low rotating speeds.
Meshing is the most crucial issue here, and the results I obtained varied enormously (100%) when trying different meshes.