The purpose of the following is to determine the acceleration of a particle over time in a flow field based on its 3 dimensional vector.
Image from the National Committee for Fluid Mechanics: Illustrate the Eulerian
V = 3ti + xzj + ty^2
Find the partial derivatives (w.r.t. x, y ,z, & t) of the convective terms of the combined acceleration vector.
Combine all four terms into the single , "total" or "substantial" derivative.