1. The problem statement, all variables and given/know Say I have a can of water, and I am rotating it about its central axis at a constant angular rate. The water in the tank should make a 3D almost parabolic curve as it touches the the walls of the tank. Can I use Bernoulli's equation along y=0, r =0 ( starting from the minima of my parabola) to the radius (r=R) to solve a problem involving this system? Is P = (1/2) + rho*v^2 = const valid? 2. Relevant equations P = (1/2) + rho*v^2 = const 3. The attempt at a solution I would think P = (1/2) + rho*v^2 = const may be valid because if the fluid is rotating with the tank as a rigid body, assuming we are looking at it after it has been spun up and is rotating with constant angular rate, then it is at steady state? The density of the fluid I am assuming is constant. I am assuming viscosity is negligible Are the streamlines just circles and I'm going normal to them?