Rayleigh-Benard Convection (two-dimensional and very turbulent)
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- čas přidán 17. 06. 2014
- Numerical simulation of highly turbulent two-dimensional Rayleigh-Benard convection. Be sure to watch this in HD!
Hot (red) fluid rises from the hot bottom plate while cold (blue) fluid falls down from the cold top plate. The mean temperature corresponds to white.
The Rayleigh number is 10^13 and the Prandtl number is 1; the aspect ratio of the simulation is 16:9.
Two seconds of the video correspond to one so-called free-fall time unit, i.e. the travel-time from plate to plate of a parcel of hot fluid that is accelerated by gravity and not slowed down by surrounding fluid.
The numerical resolution is 7680x4320 gridpoints, i.e. one pixel of the 1080p-Video corresponds to 4x4 gridpoints. - Věda a technologie
Outstanding. I could not decide if it was an experiment or simulation before I read the description.
this is simply breathtaking
This is so very beautiful! Do you have a description of the code somewhere?
It's interesting that this develops into more or less a single overturning cell, with most of the ascent in one portion of the domain and most of the descent roughly halfway across the domain. Is that a robust result at these parameter settings? Over what parameter ranges would an organized overturning cell like that be expected to emerge, as opposed to disorganized, "popcorn" convection? Thanks! Awesome video.
Looks strangely similar to simulations of stars forming from clouds of gas. Stellar!
Hi. Beautiful simulation! Are there an research article on the topic?
Beautiful man
Very nice! What method / numerical solver do you use to simulate the fluid? And what advection scheme (or upwind scheme) do you use to update the phase fractions (red, blue and white phases)? If you use simple bilinear interpolation (i.e. a first-order upwind scheme) to update these fields, they tend to get smeared out over time, but it looks like the separation between the difference phases are kept very well in this simulation (although maybe that is just because the grid you use to simulate this on is four times as fine as the video resolution).
Amazing! What is your visualization tool?
amazing,wihch sofware was used?
So cool! Would you mind sharing Ra, Pr, etc?
Just when I thought the picture was impressive, I read the description! 🤯🤯🤯
If you could get this to play in a ten hour loop, with a fluid transition between cuts?!
Oh👏🏼My👏🏼Goodness !!!!! 😍
♥️🖤,
A Dorothy In Kansas
A Freak In Red Mary Janes
amazing
i love it!
Amazing
Please tell me how you made this. did you write the program yourself?
hi, which program in this sumulation is used ??
very nice :) may I ask, you didn't limit the motion of the fluid on the left and right? and if not how far left and right did you calculate? thanks
I believe, he has periodic lateral boundary conditions (vortexes exiting the computational domain on the right enter the domain on the left).
Fantastic stuff. I'm interested in learning more about how this might apply to large bodies of molten rock - e.g. the lunar magma ocean, at Ra values in excessof 10^20.
Nature is the best artist
Hi! This looks amazing! Would you mind sharing the code? It would be great for illustrative purposes!
Looks incredible! Would it be possible to re-use this video for a talk about turbulence?
Sure, just quote our youtube channel.
@@michaelwilczek8676 Brilliant - thanks!
10hour loop would be nice
Credits of this simulation must be given for which person?
seasons on Jupiter be like
which software or coder did you use for this simulation ?
What initial conditions did you use for this simulation?
Philip Sakievich it looks like static conditions were used. As far as temperature, what matters for this is the temperature differential, not the average temperature. As for boundary conditions, I'm curious what the temperature difference is, but it's clear that there are periodic BC on the left and right. The top and bottom are static. I'd be interested to see what all static boundary conditions would look like, as this would more closely model a pot/pan
Beautiful! but in the two-dimensional case the flow can not be considered as turbulent because in two-dimensional case there is no mechanism of the vortex stretching.
Turbulence is the process of stretching and tilting of vortex tubes in the flow. In 2D the vortex tubes are all parallel to the z-axis and tilting of the vortex tubes is therefore not possible. However the stretching is still possible, but with the absence of the tilting, you will get an inverse cascade and formation of large scale strutures.
Is it DNS?
Yes!
Add some continent shapes and you might get the ocean currents of another planet.
:)
Is this what happens you put milk in your coffee and stir? 😊
ok
This si not Rayleigh Benard instability, it is Rayleigh-Taylor instability.