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-   -   Urban wind flow modelling - formular needed (http://www.cfd-online.com/Forums/main/68059-urban-wind-flow-modelling-formular-needed.html)

charltonjames September 4, 2009 08:16

Urban wind flow modelling - formular needed
 
Hi

i am planning on using Star-CCM+ to model wind flow in city centre squares. However, before i do this, i am trying to establish an accurate formular for wind flow in urban areas. Thanks to another forum user (highnelly) i have the following formular for rural areas;

The following are the equations you need fro your wind profile in a rural (barren location) so they may need to be modified for city region:

http://www.cfd-online.com/Forums/vbL...1dd43c53-1.gif

where http://www.cfd-online.com/Forums/vbL...3a695e91-1.gifis your ref vertical height, http://www.cfd-online.com/Forums/vbL...e80ddabd-1.gifis your roughness height,http://www.cfd-online.com/Forums/vbL...3c97c188-1.gif is von Karman constant; http://www.cfd-online.com/Forums/vbL...cf0b8761-1.gif is your ref wind speed, http://www.cfd-online.com/Forums/vbL...7111f36e-1.gif is turb model constant; and http://www.cfd-online.com/Forums/vbL...809f19a7-1.gif is your frictional velocity.

Can anyone help out???

Regards

James


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