Why do some build­ings hum in high winds?

BBC Earth (Asia) - - Q & A - RM

When the wind blows across a build­ing with re­cesses, lou­vres or other ar­chi­tec­tural fea­tures, it can start to ‘hum’, like some­one blow­ing across the top of a bot­tle or a reed. For ex­am­ple, the 169m-tall Beetham Tower in Manch­ester makes a note just be­low mid­dle C. To cure the noise, en­gi­neers have to make al­ter­ations to the mass and shape of the fea­tures that are caus­ing the prob­lem.

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