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.
More than that, people need to learn to read men. “Yeah I’m fine, don’t worry” is often a very quiet cry for help from a gender which is traditionally taught to show only strength and permanence and to never show outward signs of “weakness”.
It’s nothing short of traumatic, the upbringing where you don’t get to cry.
TL:DR Fuck the patriarchy