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August 4, 2011, 09:54 |
Moving Volumes Problem
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#1 |
New Member
John Gallagher
Join Date: Apr 2009
Posts: 4
Rep Power: 17 |
Hi,
I have prepared a street model which has moving volumes (cars). I have looked at the tutorials available for sliding and dynamic mesh, but still cant get my trial model to work. The current set-up is that the main volume (representative of a street canyon) is run to time X to create a steady state of air flow, and then the moving volumes enter and exit the model from outside the street. I changed the properties of the 'cars' from a stationary wall to a moving wall. I attached a speed and Z direction and left other properties as default. Also, I turned on the dynamic mesh, a rigid zone for the cars and a deforming zone for the street volume. I know from running the model for a few seconds, that the cars are not moving... what am I doing wrong??? I haven't written a UDF before, but I question whether I need it or not for this model. I am using Fluent 6.3 (old school) with a LES turbulence model. Can anyone help? Thanks, John |
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August 5, 2011, 05:41 |
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#2 |
Member
Adrien Lemoine
Join Date: Jun 2011
Location: Paris,France
Posts: 31
Rep Power: 14 |
Hey,
moving wall in the boundary condition menu is only used with a moving reference frame. You have to create a UDF defining the movement If you really want to see the car moving it s the only option. There are good examples of UDF in the Fluent Help (6.3 or 12.1) If you want me to take a look to help you a bit more, send a picture of the geometry/mesh Adrien
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August 5, 2011, 06:09 |
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#3 |
New Member
John Gallagher
Join Date: Apr 2009
Posts: 4
Rep Power: 17 |
Adrien,
Thanks for your response. Ok, I have to create a UDF for the cars. I have this link for "grid motion" which I think is correct (but my UDF should be a lot simpler!). http://my.fit.edu/itresources/manual...udf/node78.htm Is this correct? Unfortunately, I cannot post the picture, can I send it to you via email? Kind Regards, John |
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August 5, 2011, 13:19 |
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#4 |
Member
Adrien Lemoine
Join Date: Jun 2011
Location: Paris,France
Posts: 31
Rep Power: 14 |
Hi,
I won't have time this week end to check at your mesh but send me a email and I ll take a look on Monday. Em@ail : lemoine.adrien@hotmail.fr Best regards Adrien
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------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------ |
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