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thanhtruc
Posts: 11
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 Posted: Fri May 13, 2011 3:19 am Post subject: CFD siumlation and ceilling |
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Hi,
I am modelling air distribution for a seven floor building. The result is quite "strange" when the air flow can pass through the slab of closed-ceiling, no hole for air in. I have tried to set the grid spacing is the same with the height of the floor. Could you suggest me how to solve this problem to make the CFD result more realistic?
Thanks for any suggestion, shared experiment.
Best regards,
Truc Pham
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Steve Potter
Posts: 572
Location: newcastle |
| Posted: Sat May 14, 2011 5:04 pm Post subject: |
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Hi Truc,
Could you upload your model to the forum so that we can take a look at it? Perhaps you could also indicate which ceiling is exhibiting this problem.
Regards,
Steve
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thanhtruc
Posts: 11
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| Posted: Mon May 16, 2011 1:35 am Post subject: CFD and ceiling's slab |
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Hi Steve,
Please find the attached model. the ceiling of the 4th floor and above have the CFD result problem that the air get through the slab.
Thanks and look forward to your feedback.
Regards,
Truc Pham
| Description: |
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Download |
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110513_GC_Atrium.rar |
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3.12 MB |
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292 Time(s) |
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Steve Potter
Posts: 572
Location: newcastle |
| Posted: Mon May 16, 2011 8:46 am Post subject: |
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Truc,
You have specified such a large grid line merge tolerance (0.5m) that the grid lines that would normally coincide with the faces of the slabs are being merged together and consequently the floor slabs are being 'dropped out' altogether.
Generally speaking, it is a good idea to use as low a grid line merge tolerance as possible to achieve acceptable cell aspect ratios without losing too much in the way of model detail. With your model, if you use a default grid spacing of 0.5m and a grid line merge tolerance of 0.05m, you should find that these settings result in a relatively low aspect ratio and the floor slabs will be retained.
Hope this is of help.
Regards,
Steve
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thanhtruc
Posts: 11
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| Posted: Mon May 16, 2011 9:55 am Post subject: CFD and ceiling's slab |
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Hi Steve,
Thank you very much for your suggestion. it worked out  .
Regards,
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