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pressure distribution in rotating cylinder
Posted Nov 22, 2010, 9:13 a.m. EST 2 Replies
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Hii,
I am a beginner in COMSOL. I want to model a rotating cylinder filled with air. The surroundings of cylinder is air as well. I want to see the pressure distribution inside the cylinder. The solution is converging and displays the results but I have doubt on its accuracy. Can someone check my model
A major doubt I have is about the geometry: I have placed an air cylinder inside the plastic cylinder...is it right way to model the air inside the plastic cylinder. Should I use the contact pair definition to attach both of them.
I am attaching my model here. Can explain it further if someone could help
I am a beginner in COMSOL. I want to model a rotating cylinder filled with air. The surroundings of cylinder is air as well. I want to see the pressure distribution inside the cylinder. The solution is converging and displays the results but I have doubt on its accuracy. Can someone check my model
A major doubt I have is about the geometry: I have placed an air cylinder inside the plastic cylinder...is it right way to model the air inside the plastic cylinder. Should I use the contact pair definition to attach both of them.
I am attaching my model here. Can explain it further if someone could help
Attachments:
2 Replies Last Post Nov 23, 2010, 5:16 a.m. EST
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Posted:
1 decade ago
Hi
I beleive your model is slightly complex to start with. First of all it depends on what you want to mode, is it the cetrifugal force acting on the fluid, or a transient analysis of the fluid starting to rotate induced by a non-slip flui-wall inteaction ? And is the air around (outside the plexi) really useful ?
You can in principle start just with a cylinder, static and say the reference is rotating at a rotational speed w0, which induces a body load on the fluide. Or you use the rotating domain.
Furthermore, I would not use "contact" as these are rather for mechanical (structural) contact. An identity pair is sufficient for the rotating boundary. Check the doc
--
Good luck
Ivar
I beleive your model is slightly complex to start with. First of all it depends on what you want to mode, is it the cetrifugal force acting on the fluid, or a transient analysis of the fluid starting to rotate induced by a non-slip flui-wall inteaction ? And is the air around (outside the plexi) really useful ?
You can in principle start just with a cylinder, static and say the reference is rotating at a rotational speed w0, which induces a body load on the fluide. Or you use the rotating domain.
Furthermore, I would not use "contact" as these are rather for mechanical (structural) contact. An identity pair is sufficient for the rotating boundary. Check the doc
--
Good luck
Ivar
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Posted:
1 decade ago
Thanks Ivar, Yes I am interested in centrifugal force acting on fluid. I have removed the outer air block , i think it is not that necessary . The modified model is showing some believable results. I am trying it to improve it a bit more
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