CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Advise with a wheel simulation

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 21, 2005, 11:05
Default Advise with a wheel simulation
  #1
Freeman
Guest
 
Posts: n/a
Hi all (again)!

Which is the best way to simulate the folw over a car wheel (in 3D)?

I know some issues with the contact wheel and ground: it cannot be tangent, there must be a "contact patch". But if there is this contact patch, the simmetry does no longer exist, so I can't rotate the wheel mesh... what can I do? I only have an idea, and it is about to say Fluent that the tire and the rim "walls" have a velocity (a rotation).

And what about with the "roughness" of the tire?
  Reply With Quote

Old   November 21, 2005, 16:15
Default Re: Advise with a wheel simulation
  #2
Alan
Guest
 
Posts: n/a
Hi Freeman,

Hope this helps, you dont have to use a moving mesh. Just define your 3D wing as a wall, and in boundary conditions define it as a spinning wheel. Yes, make sure you get the angular velocity right which you calculate from a formula based on your wheel radius and linear velocity.

The only problem you might have is to get a converged solution. The damn thing hardly converges!

Hope this helps and good luck!

Alan.
  Reply With Quote

Old   November 21, 2005, 17:25
Default Re: Advise with a wheel simulation
  #3
Freeman
Guest
 
Posts: n/a
Thaks for your answers, Alan!

OK, there's only one more question. How can I represent the roughness of the wheel in a realistic way? What roughness value did you use in your simulations? As far as I can remember, I think that there are some turbulence models in Fluent that the roughness is disabled (RSM and other one I think): in these cases, is there any possibility to simulate tire's roughness?

Many thanks!
  Reply With Quote

Old   November 22, 2005, 05:42
Default Re: Advise with a wheel simulation
  #4
Alan
Guest
 
Posts: n/a
Hi Alan,

To be honest, I wouldnt worry about the tire roughness at this stage since it can cause even more turbulence and there is no such turbulence model that can handle that. Use the default values, get some initial values and try playing with different roughness values of your choice.

Depends how much accuracy are you after!

Thanks,

Alan.
  Reply With Quote

Old   November 22, 2005, 11:00
Default Re: Advise with a wheel simulation
  #5
Freeman
Guest
 
Posts: n/a
OK! Thanks for all Alan. Bye!
  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
paddle wheel simulation s_saleh FLOW-3D 3 May 12, 2017 16:51
Simulation of a complex wing in solidworks flow simulation niels1900 FloEFD, FloWorks & FloTHERM 6 April 20, 2011 11:44
GUI crash and simulation engine still running RPJones FLOW-3D 2 November 9, 2010 09:18
velocity profile export from a simulation onto another sudhirlv STAR-CCM+ 1 September 12, 2010 19:57
Replacing mesh while running a simulation akultane CFX 1 November 15, 2009 14:46


All times are GMT -4. The time now is 20:31.