It is really ancient and was done to create simulations of fluid going from a bottle to a glass, or chocolate on a fruit, a biscuit.
Think of it, did you really ever seen a scene like that ?
What you see is 10-15 centimeters of mesh that looks like a turbulent fluid, then you have 2 meters of fluid mesh that is as cylindrical than the water hose and 2 meters of empty hose. You never thought that it could be a moving domain.
You don’t need a fluid simulation for that sequence. You can achieve this by a highly distorted, displaced front side of a cylindrical shape that moves from start of the water hose to its end according to an animation following a spline. plus a little bit of particles.
If you cut this sequence by close-ups of inside of the tubes where fluid simulations are used, you think that the whole video was to done like that. But it is an illusion.
The same way, rivers and tsunamis are often displaced mesh partially masked by particles.
Or when they are made by Hollywood, they are simulations that correspond to a resolution of 512, 1024, 2048 cells … computed on cloud, simulation farms.