3 ms·
Prandtl–Glauert singularity https://en.wikipedia.org/wiki/Prandtl–Glauert_singularity https://en.wikipedia.org/wiki/Prandtl–Glauert_singularity > The Prandtl–
by p2t2p 5y ago
Prandtl–Glauert singularity
https://en.wikipedia.org/wiki/Prandtl–Glauert_singularity https://en.wikipedia.org/wiki/Prandtl–Glauert_singularity
> The Prandtl–Glauert singularity is a theoretical construct in flow physics, often incorrectly used to explain vapor cones in transonic flows. It is the prediction by the Prandtl–Glauert transformation that infinite pressures would be experienced by an aircraft as it approaches the speed of sound. Because it is invalid to apply the transformation at these speeds, the predicted singularity does not emerge.
> The incorrect association is related to the early-20th-century misconception of the impenetrability of the sound barrier.
I learnt about it from Destin's video: https://youtu.be/p1PgNbgWSyY?t=816 https://youtu.be/p1PgNbgWSyY?t=816
- ben_w 5y agoAnyone using that formula must have either (1) known that the formula was inaccurate at that airspeed, or (2) denied the existence of supersonic shells and bullets. Likewise today, we know something is wrong with the combination {relativity, quantum mechanics} because if our formula for both were completely true, the universe wouldn’t exists. The supersonic munitions of the era were rather difficult to ignore, so you need better evidence to claim PhDs would’ve laughed at the idea, than merely that the best formula they had at the time was not good enough.