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Old   September 5, 2006, 03:52
Default Rotating bike wheel
E. Turner
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Hi all !

Is it possible to compute the flow past a rotating wheel in Fluent, that is, a wheel on ground and with spokes ? As far as I understand, the tire must be flattened a bit at the ground as it can't be tangential. The faces on the outside of the tire then get rotating-wall-bc's, but what about the 'inside' of the wheel (rim, spokes, hub)... I would like to use a rotating mesh here, what do you think ? The interface-zone whould have to be cut in the middle (contact between rim and tire), how does one model this ? What zone do I assign to the tire-faces that contact the rim ?

Thanks a lot, E.T.
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Old   September 5, 2006, 18:38
Default Re: Rotating bike wheel
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Hi Turner,

Your question is not clear. Rotating mesh?.

As far as i understand create the tyre, rim and spokes as one volume1. Create a big block (volume 2) to cover the volume 1.

subtract the volumev from volume 2.

You dont need to hav a flat part at the bottom. it can be tangential.

Make sure the tyre,rim and spokes are as simple as possible to get a good clean mesh.

Don know what you are really trying to simulate, so iam unable to suggest you with any more options.

Please elaborate you problem precisely to discuss further.




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Old   September 7, 2006, 05:22
Default Re: Rotating bike wheel
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Fluent can handle the tangential surface, but usually the mesh quality is very low due to the small angles near the ground-tyre interface. To avoid highly skewed cells it is better to model a contact pad. I would use a rotating mesh for this problem. Be careful in choosing the turbulence model, some models will not work with rotating sliding meshes, see Fluent User Guide for more details.
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Old   October 1, 2006, 00:44
Default Re: Rotating bike wheel *NM*
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