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.
Guess I'll just burn ( sh.itjust.works ) Englisch
Eurovision expresses disappointment over performer wearing pro-Palestinian symbol ( tribune.com.pk ) Englisch
The musician was seen wearing a keffiyeh on his arm, a symbol commonly used to show support for Palestine....