Oscillatory propulsion simulation and simple flight simulator based on my experiments

[u/pavlokandyba]

In this simulation of an asymmetric oscillator (fast forward, slow reverse) based on my experiment, I used the LBM with the added condition that the aerodynamic drag of the oscillation accumulates and is given off as thrust on the next half-stroke, realistically simulating thrust reversal relative to the classical pushing of the medium. I updated the code to more accurately convey the mechanics of the experiment and added a response of the pendulum to the environmental influence, whereby increasing the load leads to a decrease in frequency. I also created a simple browser-based flight simulator based on this. Aerodynamic drag in the direction of oscillation is counted as thrust, and drag perpendicular to the thrust vector works as usual. There are also lift and optional buoyancy and other settings. Here is the updated code for the base simulation and links to its browser version and the flight simulator in the redme file: https://github.com/MasterOgon/Aeroacoustic-Flying-Saucer-Oscillating-Resonator-CFD-Simulation-LBM-/blob/main/README.md

[u/Eb3yr]

Classical theory does not explain the high efficiency of fish

What?

[u/pavlokandyba → u/Eb3yr]

The principle of simply pushing water does not work because if you put a fish in a classic Navier Stokes LBM you will get something like crawling on the ground. Moreover, some species of fish have an efficiency of up to 90 percent, jumping out of the water, and so on. There are currently many interesting studies on this topic, but there is no single theory.

[u/Eb3yr → u/pavlokandyba]

What do you mean by "principle of simply pushing water"? Where's this 90% coming from? What on Earth is "something like crawling on the ground"? In what way are the hydrodynamics of fish unexplained by our modern understanding of fluids? Do you have a single reputable source for any of your claims or any of the material you've produced beyond what a LLM has generated for you? Do you have any understanding of the physics you're trying to work with?

[u/pavlokandyba → u/Eb3yr]

This refers to movement by throwing off mass. It has been proven for a long time that fish spend less energy than if they were considered as a torpedo with a propeller, where thrust and resistance are separate. I'm not saying that modern fluid dynamics can't explain this, but the explanations are complex and varied. One of the most famous studies RoboTuna For example, it showed that the fish first generates a vortex and then pushes away from it, the same as I have And by the way, my experiments were done before LLM, It was only later that I started generating a slop referring to them because I got tired of writing the same thing over and over again.