2 ms·

A naive application of fluid dynamics would suggest that the answer to 2 is to go perpendicular to the flow until you reach a wall, then go against the flow tow

A naive application of fluid dynamics would suggest that the answer to 2 is to go perpendicular to the flow until you reach a wall, then go against the flow towards an exit. In the middle of a crowd/fluid your motion is determined by the humans/molecules around you. The closer you get to a wall, the fewer particles have an influence on you. Just make sure it's not a wall people are moving towards. Not sure if anyone has studied how well this holds up to humans. Human crowds have very fluid-like behavior, but of course they don't behave perfectly like a liquid in a pipe

xeonmc 2y ago
> Human crowds have very fluid-like behavior, but of course they don't behave perfectly like a liquid in a pipe Hypothetically, how would the dynamic change if it were a crowd of cats instead?
- thfuran 2y ago
  Non-cat fluids don't usually spontaneously draw knives and start cutting themselves apart.
alwa 2y ago
Is there anything to the notion that you might prefer to be batted around in the “soft body” portion of the dense-crowd “fluid” rather than pinned between several tons of soft bodies in motion and a hard limit? You seem rather more crushable than an individual molecule might be… (edit: “crowd crush safety expert” Paul Wertheimer, who came to some notoriety through studying mosh pits from within them, apparently suggests—at least in situations where the crowd is moving toward a clear focal point—you’re right: he recommends the edges https://www.cnn.com/2021/11/13/us/how-to-stay-safe-at-concerts-cec/index.html https://www.cnn.com/2021/11/13/us/how-to-stay-safe-at-concer... That said I note that the authors of TFA draw a distinction between dense-crowd situations undergoing unidirectional flow and the steady, confined dense crowd whose behavior they describe.)

2 ms·

A naive application of fluid dynamics would suggest that the answer to 2 is to go perpendicular to the flow until you reach a wall, then go against the flow tow

by wongarsu 2y ago

xeonmc 2y ago
> Human crowds have very fluid-like behavior, but of course they don't behave perfectly like a liquid in a pipe Hypothetically, how would the dynamic change if it were a crowd of cats instead?
- thfuran 2y ago
  Non-cat fluids don't usually spontaneously draw knives and start cutting themselves apart.
alwa 2y ago
Is there anything to the notion that you might prefer to be batted around in the “soft body” portion of the dense-crowd “fluid” rather than pinned between several tons of soft bodies in motion and a hard limit? You seem rather more crushable than an individual molecule might be… (edit: “crowd crush safety expert” Paul Wertheimer, who came to some notoriety through studying mosh pits from within them, apparently suggests—at least in situations where the crowd is moving toward a clear focal point—you’re right: he recommends the edges https://www.cnn.com/2021/11/13/us/how-to-stay-safe-at-concerts-cec/index.html https://www.cnn.com/2021/11/13/us/how-to-stay-safe-at-concer... That said I note that the authors of TFA draw a distinction between dense-crowd situations undergoing unidirectional flow and the steady, confined dense crowd whose behavior they describe.)