aerodynamic instability

aerodynamic instability

[‚e·ro·dī′nam·ik ‚in·stə′bil·əd·ē]
(aerospace engineering)
An unstable state caused by oscillations of a structure that are generated by spontaneous and more or less periodic fluctuations in the flow, particularly in the wake of the structure.
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References in periodicals archive ?
The attached flow around the streamlined body causes extreme aerodynamic instability [1].
The resulting change in the cable's profile can affect the way it reacts to wind, creating an aerodynamic instability that sets the cable vibrating at some resonant frequency, somewhat like a guitar string.
Hiller's tilt-wing X-18 VTOL aircraft also showed considerable promise, but when early test flights revealed potentially hazardous aerodynamic instability, the Air Force quickly terminated the program.

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