The answer clearly says the y-direction velocity is assumed to be zero, and that it's primarily done to simplify the Navier-Stokes equations.

Any new developments on this field?

Also, does that mean that one could theoretically "enlarge" an atom until it is visible to the naked eye for an observer outside the distorted space? (By expanding the space occupied by an atom) (edit: this all makes me think that energy space warping might not be actually possible, or there's a lot more to it on the effects of the matter in it which I don't understand lol)

This was the distortion I had in mind, thanks for the answer! The original thought experiment came into what would happen to humans traveling in situations with space distortion (such as the proposed spaceship travelling a space "wave"). It seems like physically their bodies would be okay, but I wonder what would be the accompanying time warping effects in their mind/body?

Thanks Andrew and Apekshik for your time in answering! While Andrew brought in some very interesting points and phenomenons in the hypothetical space warped scenario, Apekshik addressed the test case I imagined more directly and thus the bounty award. Thank you again both for your time!

The key is that it's "almost" perpendicular. If you do a diagram of the forces, you'll see there's a force component that's actually propelling the skater forward.

But to answer your question, if you start with Navier Stokes you get all the viscosity there. Start taking down the stuff you don't need, and you'll have yourself an equation.

For pipe-design purposes, usually as pressure losses per length of pipe is added into bernoulli, and the corners and inlets/outlets are also counted as energy losses. There's books out there with tables for these. A quick google look-up pop this up: nzifst.org.nz/unitoperations/flfltheory5.htm

I don't quite get the picture of what happened. Was the drop suspended? Mercury is opaque, so I assume you saw these bits of iron on the surface of the drop of mercury?