[TRNSYS-users] wind speed

[David BRADLEY]

Jihad,
   CFD stands for Computational Fluid Dynamics. CFD Software packages 
are highly complex and seek to determine air flows by breaking up air 
volumes into millions and millions of finite elements; each finite 
element's momentum is described by the Navier Stokes equations. While 
TRNSYS can connect with Fluent (one particular CFD tool), it does not 
have a CFD package built in. Cosimulation between TRNSYS and a CFD is a 
very rarely used technique and is almost never used in building 
simulation because of the enormous time needed to solve the flow problem.

I think it would be wise to find a TRNSYS expert who can assist you in 
defining the problem that you want to simulate and to determine whether 
you really need to know the speed of air flowing through your building. 
If interzonal air flows are needed at all then simplified approaches are 
used (TRNFlow, CONTAM, etc.). I want to stress, however, that even these 
simplified techniques are quite complicated to implement, are not for 
TRNSYS beginners and more often than not, are unnecessary except for 
complex spaces such as atria and for natural ventilation studies.

Regards,
  David


On 3/13/2013 11:11, jihad alaoui sosse wrote:
>  thanks but when i can find the  CFD softwares on my instalation.
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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