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Canouan Island - local wind assessment |
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Flow Analysis Ltd were commissioned to investigate the local wind conditions in and around a proposed holiday villa on Canouan Island (one of the Windward Islands). The proposed site is on top of an exposed hill and the client had concerns that the site would be over-exposed and uncomfortably windy. A CFD model of the top portion of the hill with the proposed villa perched on top was created. Most of the planned and existing trees were also included and a surface roughness was assigned to the hilltop to create as realistic a model of the terrain as possible. An up-to-date MET office wind data set was obtained to enable the local wind statistics to be determined. The closest realiable data set was for Barbados. The wind statistics were very different to those for the UK, since the wind is from an easterly direction for more than 50% of the time. |
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It was decided that the best approach to quantify
the local wind conditions was to combine CFD solutions for 12 wind directions
with the MET office statistics and compare with the accepted criteria for
pedestrian comfort analyses.
The results showed that the overall orientation of the building is crucial to maintaining comfortable wind conditions within the main seating area between the two south-facing 'legs' of the building. The important easterly winds are slowed by the hillside vegetation and eastern leg of the building resulting in relatively low-speed local winds in the seating area. Statistically, it was found that the accepted criteria were comfortably met. It is interesting to not that the results would probably have been very different if the layout had been rotated by 90 degrees. |
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