1. The problem statement, all variables and given/known data Consider steady, incompressible, parallel, laminar flow of a film of oil falling down an infinite vertical wall (Figure P-1). The oil film thickness is “h” and gravity acts in the negative Z-direction (downward on the figure). There is no applied pressure driving the flow – the oil falls by gravity alone. Calculate the velocity and pressure fields in the oil film and sketch the normalized velocity profile. Neglect hydrostatic pressure changes in the surrounding air. 2. Relevant equations 3. The attempt at a solution Hello, I wanted to check if I am doing my Navier-Stokes correctly. Also, why is the dP/dz term zero conceptually? Does that have to do with the last statement ''Neglect hydrostatic pressure changes in the surrounding air''? Also, I do not know how to calculate the ''pressure field''. First of all, is this the pressure profile, just to understand that the names are synonymous. Secondly, how would I go about calculating a pressure profile? From what I recall, all I remember Navier-Stokes doing is calculating velocity profiles.