Which type of flow Eulerian or Lagrangian can be compared to

Which type of flow, Eulerian or Lagrangian, can be compared to data received from a buoy as it floats along with ocean currents? Circle the term in the navier stokes equation that is zero for ALL steady flows, (.x direction) rho(partial differential/partial differential t + partial differential u/partial differential x + v partial differential u/partial differential y + w partial differential u/partial differential z) = - partial differential p/partial differential x + rho g_x + mu (partial differential^2 u/partial differential y^2 = partial differential^2 u/partial differentaily^2 + partial differential^2u/partial differential z^2) A 2D potential flow is often shown as a grid of lines as shown in the picture below, these two types of lines are called?

Solution

1)

the use of lagrangian devices has become very popular in oceanography.
drigting buoy have been developed that can follow the ocean currents with good
accuracy moving either at surface of the ocean or in the interior on surfaces