Having trouble sleeping so here's a data sci nerd story for you all.
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Replying to @EmilyGorcenski
There are, to my knowledge, only two functional transonic dynamics wind tunnels in the world, one at Calspan, and the TDT at NASA Langley.
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Replying to @EmilyGorcenski
Supersonic tunnels are far easier to operate. Transonic is much, much harder. (The trans is always annoying lolol).
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Replying to @EmilyGorcenski
A dynamics tunnel requires more than blow-down designs. And the tunnels are so complex tbat non-rigid models are a no-no. If one breaks...
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Replying to @EmilyGorcenski
please, do go on! I just learned the word “transonic” and I'm fascinated
Like e.g. what does a dynamics tunnel do that's so complicated?2 replies 0 retweets 0 likes -
Replying to @erincalling
Dynamics here means non-rigid models, so aeroelastic analysis is possible, e.g. flutter, control surface movement, etc.
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Replying to @EmilyGorcenski @erincalling
Aeroelasticity is hard, and every aircraft has a flutter limit at which point the loading can break the structure.
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Replying to @EmilyGorcenski @erincalling
This would be bad in a multi-million dollar tunnel with air moving at 700mph.
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Replying to @EmilyGorcenski @erincalling
Transonic refers to the range betwern Mach 0.7ish and Mach 1.2ish, depending on structure.
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Replying to @EmilyGorcenski @erincalling
In transonic flow, air moves at > Mach 1 at some parts of the model, and shockwaves form, but not everywhere
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The transonic range is poorly understood and even our best computational models today perform v poorly.
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