"Problem: Pressure waves move fast so this explicit method must use very small timesteps or go unstable." Why is this a problem? How small could the timesteps be that it becomes an issue? I feel like the fluid simulations I've watched were at such high FPS already
michelllepan
In the lecture the professor mentioned that the pressure wave could move at something like 1000 m/s, so any slower frame rate that doesn't capture that movement could result in instability
joeyhou0804
It is interesting to notice that a pressure wave moves very fast as this can cause unexpected issues when the timestep isn't small enough. Since frame rates are also related to the timesteps being used, we need to take this into consideration when trying to decide the timestep when using this method.
"Problem: Pressure waves move fast so this explicit method must use very small timesteps or go unstable." Why is this a problem? How small could the timesteps be that it becomes an issue? I feel like the fluid simulations I've watched were at such high FPS already
In the lecture the professor mentioned that the pressure wave could move at something like 1000 m/s, so any slower frame rate that doesn't capture that movement could result in instability
It is interesting to notice that a pressure wave moves very fast as this can cause unexpected issues when the timestep isn't small enough. Since frame rates are also related to the timesteps being used, we need to take this into consideration when trying to decide the timestep when using this method.