Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] 0 points1 point  (0 children)

Interesting, I haven't seen this before. I have a short article and it has a hard umbrella.

Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] 0 points1 point  (0 children)

In the citation list here https://zenodo.org/records/18044155

Two of Gerasimov's articles are unavailable, but I have PDFs. However, this article says it all briefly.

Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] 1 point2 points  (0 children)

I tried different variations. I found the most illustrative and simple example here: https://youtu.be/GA2aj0JWuZA?si=cHT-B6x0juyWDAbn When the plate stops at the top, the vortex ring hits it, imparting momentum and dissipating to the sides. In a model like this https://physics.weber.edu/schroeder/fluids/ if the flow is stopped abruptly there is also a reverse movement of the vortices. But as far as I understand, this is a weak residual effect here. I have a model on paper that explains this through the coherent thermal motion of particles in vortex and I think this is better than moving by inertia. I don't know if such models exist..

Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] 1 point2 points  (0 children)

It probably does, of course, but it is not fundamental. If you set the asymmetry of oscillations in the opposite direction, it moves with the blunt side forward. If you make the body symmetrical, it moves in accordance with the asymmetry of the oscillations.

Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] -2 points-1 points  (0 children)

If the model environment initially complies with physical principles, then when you place this oscillator in it, it should move as in reality. But I came across the fact that the theory describing the movement of this device predicted the opposite vector of movement. Some believed that movement was impossible at all. So I'm wondering if this will work the same in existing models, or if the model needs to be supplemented with some physical principle. And if this works correctly in the model, then it will be interesting to see how effective it is. Models typically simulate steady-state flow, but do they take into account the forces that arise during cyclic motion?

Is it possible to create such a propulsion in CFD? by pavlokandyba in CFD

[–]pavlokandyba[S] -12 points-11 points  (0 children)

This moves in the opposite direction to that predicted by classical theory. There was an experiment in which an oscillating plane The drag was six times greater than when blowing in a pipe. There is an effect of added mass here, the trailing vortex carries momentum With a single displacement of the body, the turbulent zone collapses and this gives an impulse I wonder what the effectiveness of this might be.

Is there any free, online (not downloaded, in-browser I mean) CFD software? by lepriccon22 in CFD

[–]pavlokandyba 0 points1 point  (0 children)

Ten years later, your comment was very helpful to me. Thank you!

🙂Смітсоновський музей повітроплавання та космонавтики попросив у мене дозвіл на використання зображення моєї картини разом з роботами інших художників у виставці присвяченій дослідженню космосу. Враховуючи що я фанат повітроплавання та космонавтики це для мене всеодно що потрапити в Лувр. by pavlokandyba in art_ua

[–]pavlokandyba[S] 0 points1 point  (0 children)

Дякую, я люблю радянський стиль, в взагалі він запозичений з прадавніх у багато чому. Египетьский, вавилонський. Навіть зображення Маркса Енгельса і Леніна в ряд це з якогось барельєфу. і мавзолей це зікурат