The Intergalactic Daily Message (D.M. - Die Emmers, get it, its frigging brilliant) Hosted by the Holiday House constituents in Cape Town. Spreading the good news to YOU, whilst creating the illusion that you never left home and we still love you.

Wednesday, May 31

Die Engineering Wonders; Part 1

It was just this morning while perusing the world wide web that it dawned on me… Where have all the intellectual posts gone?

So in a bid to return the community of Die Emmers once again to the road of the righteous and well informed (with mostly useless facts) I will be sharing the wonders of the modern engineering world when they manifest themselves in unusual ways.

Yes, yes I can hear the moans but just think when your kids (or when you start having kids) ask, What’s that Daddy?!

You can comfortably answer:

That my son is a…. Karman vortex street, one of the best known vortex patterns in fluid mechanics. The vortex street is just a special type of unsteady separation over bluff bodies (or an island as in the image). The vortex street is highly periodic having a frequency which is proportional to U/D, where D is the length of the bluff body measured transverse to the flow and U is the incoming flow speed. This periodicity is responsible for the "singing" of telephone wires. In fact, vortex streets are almost always involved when the wind generates a fairly pure tone as it blows over obstacles.

Ahh now don't we all feel a little more enlightened?


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