That'd be a hell of a microwave weapon over there :) Love these sand-wave ressonant-cavity sims
@danamulter
Күн бұрын
SICK. bro this is amazing
@Gekko-t4i
Күн бұрын
what's going on with sources 3,7,11,15 pausing at 1:44 ? diagonal bias from the simulation grid?
@NilsBerglund
Күн бұрын
I think so, yes.
@Gekko-t4i
Күн бұрын
@@NilsBerglund perhaps boundary cases (x+-1,y) and (x,y+-1), but not corner case (x+-1,y+-1) [a wild guess]
@KitagumaIgen
2 күн бұрын
NICE! Are the maxima of the power in the radial direction at the maxima of some Bessel function, that matches the cavity size?
@NilsBerglund
Күн бұрын
I wouldn't be surprised if they were. It looks like here we are exciting a specific eigenfunction, or a small set of eigenfunctions with close frequencies. And the radial parts of eigenfunctions in a circle are Bessel functions.
@tykjpelk
22 сағат бұрын
Maybe! There's a lot of modes allowed in this cavity, about 2300 if the radius is 12 wavelengths, and they should correspond to LP fiber modes. With some being disallowed for a symmetric excitation of course, and probably the higher order ones being excited way more. Each of them has a Bessel function radial component, but they're superimposed so the maxima might be elsewhere.
@KitagumaIgen
20 сағат бұрын
@@tykjpelk True, but I think you calculated 12 half-wavelengths (by my estimate it's about 6 full wavelengths). Looking at about 2:22 the average energy seems to be in the centre and 2 nearly-circular regions.
@tykjpelk
20 сағат бұрын
@@KitagumaIgenYes, you're right. So there's in principle 576 supported modes.
@ZacharyAlexanderP
Күн бұрын
If you like spirals, check out my galaxy simulations made with volumetric vector based sine waves.
@confusedbakugo1373
Сағат бұрын
It looks like when you rub your eyes.
@tykjpelk
22 сағат бұрын
Now we're talking! Much more striking results than I had anticipated. Have you tried adding a 180 degree phase shift to every other source? It ought to excite a different set of modes, and fully extinguish some others.
@NilsBerglund
12 сағат бұрын
I haven't tried that yet, thanks for the idea.
@chasethevioletsun9996
15 сағат бұрын
Isn't this how free-electron lasers work?
@1.4142
Күн бұрын
uzumaki moment
@Clint945
20 сағат бұрын
Hi Nils, Really interesting work. I've been following your channel for a while, mostly because of the pretty colours, but this is the first time I've seen something that directly relates to some of the work I'm doing. It's particularly interesting how you get stable "rings of power" (no Sauron involved), one near the outboard wall, one inner ring (kinda spit into two hemi-rings) and a central focus. Being able to control the radii and thickness of these rings (presumably just through altering the fundamental frequency or pulsing rate) is of interest to me. With regards to the model, I'm presuming you're solving for waves travelling through a vacuum with perfectly reflecting walls? Have you any way to introduce variable permittivity through the central volume, i.e. varying with respect to the power deposited? For any real system this will be the case and you'll end up with much more chaotic behaviour. However, if these rings could be maintained or controlled for systems with self-consistently calculated permittivity it would be pretty impactful. Reach out if you want to chat more.
@NilsBerglund
12 сағат бұрын
Thanks. Yes, I am actually using the scalar-valued (linear, hyperbolic) wave equation, with Dirichlet boundary conditions, which would represent perfectly reflecting walls. I observed that the oscillation patterns depend strongly on the frequency of the sources, which is to be expected. I have little experience with simulating Maxwell's equations, can you remind me what the permittivity does? I have the option of making the wave speed position-dependent, and can also add a dissipation term. However, it would be computationally quite expensive to reset these at every simulation step. If these values only have to be reset from time to time, that would be much cheaper in terms of computation time.
@6AxisSage
7 минут бұрын
Oh, this does the thing ❤
@blakksheep736
Күн бұрын
It looks so alien and cool!
@Vibycko
20 сағат бұрын
Portal to a new dimension
@scottcates
Күн бұрын
Really intriguing
@liz4v
16 сағат бұрын
For videos like these it may be important to match the bpm of the background music. I was trying to go in beat with the cycle and the music wouldn't let me.
@NilsBerglund
12 сағат бұрын
Sorry for that. I often try to pick the music such that the bpm match, but didn't find a good match here. The best way to avoid this is to choose the music first, and adjust the simulation accordingly. I did this now and then, but not in this case.
@liz4v
11 сағат бұрын
@@NilsBerglund that's fair! I do remember good matches in the past and I'm glad to hear that wasn't accidental 😄
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