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Urban Air Flow Dynamics: Understanding Wind Patterns in Windy Cities

Explore the complex air flow around buildings in urban areas, from turbulence to wind direction. Learn how architects and urban planners design structures for natural ventilation and safety. Watch now for insights on managing city air flow.

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Urban Air Flow Dynamics: Understanding Wind Patterns in Windy Cities

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  1. Windy Cities http://www.youtube.com/watch?v=8NSW9R1IVAk http://www.youtube.com/watch?v=SEBLt6Kd9EY http://www.youtube.com/watch?v=porZ2jOaYew

  2. London Smog … and now Then …

  3. What is wind?

  4. Turbulence Unstable eddies in the wind which disrupt the flow of air http://www.youtube.com/watch?v=1jge03Qls6s http://www.youtube.com/watch?v=HTOl0lTet9A Turbulence is rotational, three dimensional air flow Turbulence quickly turns the energy from moving air into heat

  5. Flow around a single building How does air flow around a building?

  6. Flow around a single building Strong surface winds

  7. Streets far apart Streets close together Flow down Parallel Streets

  8. How does air Flow around Buildings? http://www.youtube.com/watch?v=5lSvDKv7sTg http://www.youtube.com/watch?v=7HUUENCQFto

  9. Wind direction Source of Dye Source www.dapple.org.uk Flow down Parallel Streets

  10. Wind Tunnel Experiments Model scale ~1:400  ~400 times faster than in nature!!! flat roof H/W=1.0 flat roof H/W=0.6 high pitch H/W=0.6 high pitch H/W=1.0

  11. BT Tower NE wind direction

  12. Probability of Wind Nuisance at Eindhoven University Hall to be replaced B. Blocken et al. / Environmental Modelling & Software 30 (2012) 15e34

  13. Computer simulation of whole city air flow • http://www.youtube.com/watch?v=x3w6w0B6pf8

  14. Summary • Urban air flow is complicated! • Swirling flow is generated by buildings • At street level, the flow can even be in the opposite direction to the wind higher up • There can be large gusts at street level which can be annoying or even dangerous • Pollution can be concentrated in areas of low wind speed. • Architects and urban planners try to design buildings to maximise their natural ventilation, and to prevent dangerous air flow around them.

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