either the motion of water being swished and something being dragged in the path replacing it.that would be displacement like smoking out a moving car window and a car drives past and sucks that away

The motion of water and smoke are both considered problems in hydrodynamics. Both are "

*dissipative* systems", where the large scale motion breaks up into whirlpools or vortices, and these spin off even smaller vortices, and so on until the energy is largely dissipated.

This is entirely

*unlike* the motion of planets around the Sun, which are

*conservative* in nature - they basically keep the same angular momentum over time (with a bit of trading backwards and forwards between the planets).

who knows.

Scientists puzzled this out over a century or two - Newton's law of universal gravitation is quite simple, and predicts orbits which are periodic for hundreds of millions of years into the future (although they eventually degenerate into chaotic motion, even without external influences). It is very accurate, and just needed a small tweak from Einstein in the case of Mercury.

The

Navier Stokes equations describing the motions of fluids are far more complex, are very hard to solve, and result in chaotic motion on a millisecond-by millisecond basis. Despite their great economic value in improving the aerodynamics of aeroplanes and predicting the weather, they can only be roughly approximated on today's largest computers.

Newton basically invented differential equations as part of proving the uniqueness of the inverse square law of gravity (around 1670). The Navier-Stokes equations (early 1800s) require partial differential equations, which were a much later development in mathematics.

So I guess you could say that for about the last 2 centuries, it has been known by everyone who took the trouble to ask.