題組內容

(2) (9 points)
The Navier-Stokes equation can be written as
62022e0f6131f.jpg
where 62022e4294299.jpgrepresents the fluid velocity, p is pressure,62022e6c636f8.jpg is the gravitational acceleration, t stands for time, ρ the fluid density and p the fluid viscosity.

(a) For a steady velocity field, which term(s) in the above equation can be neglected? (I point)