Kelvin-Helmholtz instability

Hydrodynamics on a moving Voronoi mesh. Kelvin-Helmholtz instability with 50*50 cells; the color represents the surface density of the fluid.
The code is publicly available: github.com/m31...

[@FilipSund]

Very nice visualization. Plotting the cells was really instructive in visualizing the vorticity.

[@m31coding]

Hey! Thanks for your interest, the surface density is shown. The initial conditions are: Top and bottom stripe: rho=1, P=2.5, v_x=-0.5.
Middle stripe: rho=2, P=2.5, v_x=0.5.
Best regards!

[@cicik57]

how did you calculated that, do you have a link to the model?

[@sebastianfotarola-bustos525]

Beautiful simulation

[@ShockwaveEngineering]

Beautiful

[@colonthree]

Starts looking like ancient meditteranean art in the end there. ;w;)

[@absolute-sigma-1]

nice simulation

[@UsatMVS]

So why do the fluids start forming somewhat of a sine wave in the first place? What causes the wave to form?

[@m31coding]

Hi, thank you for your question. This is because there is a small sine-perturbation in the initial conditions. You may read more about the setup in my thesis: www.kmschaal.de/Diplomarbeit_KevinSchaal.pdf
best regards,
Kevin

[@ASKaPHYSICIST]

So what does the colour represent?

[@m31coding]

The color represents the density of the fluid; thank you for asking, updated the description of the video.

[@TungYuehWu]

The analysis is based on Lagrange description ?

[@m31coding]

Yes, it's a Lagrangian description of hydrodynamics since the cells are moving with the flow.

[@beachboardfan9544]

Whats the scoop, boundary layers?
Bit disappointing there isnt a L in your first name...

[@m31coding]

Hehe, exactly :) The boundaries are periodic in x-direction and reflecting in y-direction.

[@TheSysiphus]

Can you provide more information about the method used?

[@m31coding]

Hi, thank you for your interest. You may find a thesis about the hydro scheme on my homepage (www.kmschaal.de), and the first paper about this method can be accessed here: arxiv.org/abs/0901.4107
best regards, Kevin

[@robinsonidarraga9803]

@@m31coding what program did you use? Thanks

[@m31coding]

@@robinsonidarraga9803 I wrote the code from scratch; you may find it here: github.com/m31coding/Havoc

[@wjrasmussen666]

Do you have a public repo for this?

[@m31coding]

Unfortunately not, I am going to rewrite the code with best practices first.

[@m31coding]

I did some minor clean up of the code and it is now publicly available: github.com/m31coding/Havoc

[@wjrasmussen666]

@@m31coding Thank you for that. This is such a beautiful visualization. The use of Voronoi mesh really makes the swirls stand out!

[@jrtao3709]

Whaou.

[@kappaebi1]

Beautiful