It looks like it given the symbols used. P for pressure, rho for density etc. u-arrow is definitely a vector field, so it could be fluid flow. Otherwise it could be equally anything described by a vector field, like electromagnetism or gravity but they usually have a lot more E and G involved I think. I used to solve these but then I got a certificate so now I don't have to.

[–] supercriticalcheese@lemmy.world 4 points 5 months ago

It's a fluid dynamics equation, cannot be analytically solved unless laminar flow assumption is valid.

[–] InputZero@lemmy.ml 3 points 5 months ago* (last edited 5 months ago)

It really reminds me of all those static and velocity pressure calculations I had to do in undergrad, until I got the degree.

[–] nikaaa@lemmy.world 2 points 5 months ago

u stands for velocity.