COMSOL Blog

https://www.comsol.com/paper/image/66162/big.png From the following paper: "Electromagnetic Simulation of Split-Core Current Transformer for Medium Voltage Applications" by N. Paudel, V. Siddharth, S. Shaw and D. Raschka (2018) https://www.comsol.com/paper/electromagnetic-simulation-of-split-core-… Related: Learn everything about the Split-Core Current Transformer: https://innovatorsguru.com/split-core-current-transformer Video about Current Transformers: https://www.youtube.com/watch?v=32Vw40nUSwA&t=92s

I don't know the nitty-gritty of why, but some compute intensive tasks don't benefit from hyperthreading. If the processor is destined for those tasks, you may as well use that silicon for something actually useful. https://www.comsol.com/support/knowledgebase/1096

Spin a coin on top of a glass table. Observe it from the top, and it spins either clockwise or anticlockwise. Observe it from the bottom and it's the opposite. There are no tables in space. Objects tumble while rotating. It seems we are measuring rotations using a fixed perspective when there is no reason to do so https://www.comsol.com/blogs/why-do-tennis-rackets-tumble-the-dzhanibe…

If you’ve got some money, https://www.comsol.com/blogs/6-examples-of-simulation-driven-loudspeak… Those examples wouldn’t be differentiable in the sense of automatic differentiation. “Just” parametric CAD + FEM/BEM + optimizer. Though differentiable FEM has kind of been done for a while under the name “adjoint method” for topology/shape optimization. It’s not super common outside of academia though. Personally, I’m keeping an eye out for projects like https://github.com/deepmodeling/jax-fem to make some waves in that space.

Here is a simple simulation of a bicycle's stability [1]. The simulation more or less predicts what happens in real life, so we do understand why bicycles are stable. As you can see from the simulation, this is a multibody dynamics problem. The bicycle and human have lots of moving parts, and as they move there are forces in 3D [2] amongst them. So there can't really be a simplified, short and mostly complete English explanation (like for why planets go around the sun). That doesn't mean we can't predict. [1] https://www.comsol.com/blogs/simulating-the-motion-of-a-self-stable-bi… [2] i.e. you can't find a 2D plane in which all forces act.

Unfortunately the finite element software used in the forecast requires a commercial license to run. https://www.comsol.com/products/licensing

Liquid metals can be pumped with a linear motor type magnetic field, with the liquid metal being the moving part.[1] But all this just to replace a battery? [1] https://www.comsol.com/model/inductive-liquid-metal-pump-5907

Sounds like the Cocktail party problem. https://www.comsol.com/blogs/have-you-heard-about-the-cocktail-party-p…

I'm no optics expert, but considering the large width of the emission spectra of LEDs (https://www.comsol.com/blogs/calculating-the-emission-spectra-from-com… and OLEDs (https://www.omicsonline.org/open-access/exploiting-the-potential-of-ol… I'd say it's physically impossible to block their light to any acceptable degree of specificity.

20 years is equivalent to a couple of geological ages in tech, definitely not the "last few years" I was referring to. This article is from 2014 but hardly anything has changed. https://www.comsol.com/blogs/havent-cpu-clock-speeds-increased-last-ye… https://superuser.com/questions/543702/why-are-newer-generations-of-pr… https://i.stack.imgur.com/z94Of.png

Correct, one of the links in the article shows a pretty clear comparison between rainbow scale, how that looks to someone with color deficiency (with the dark portions on the ends), and their proposed scale. https://www.comsol.com/blogs/a-simulation-color-table-for-engineers-wi… - midway down the page.

You may be viewing the past with a rose filter. Incandescent light bulbs are nowhere near full spectrum. You have a decent analysis of the emitted frequencies here: https://www.comsol.com/blogs/calculating-the-emission-spectra-from-com…

Yes, e.g. bright, quality (e.g. LED), indoor light (without UV!) therapy can have benefits. https://www.comsol.com/blogs/calculating-the-emission-spectra-from-com… https://glarminy.com/2016/06/15/reduce-computer-eye-strain-headache-fl…

"CERN purchases multi-user licenses for COMSOL Multiphysics" https://www.comsol.com/press/news/article/821/ "Another factor that was attractive was the fact that a single network license allows CERN to run a COMSOL job on any number of cores or a compute cluster." And their "Floating Network License" allows use across an entire network, but not off that network: https://uk.comsol.com/products/licensing

ran into this graphic while installing some modeling software awhile back, shows thermal stress on the blades http://www.comsol.com/products/multiphysics/

https://link.springer.com/chapter/10.1007/978-0-387-98098-0_13 states the same, and mentions what I couldn’t find earlier: that they criticized Fourier for his lack of rigour (I remember that as something along the lines of “but if that’s correct, this also is and that can’t be true, can it?”, (with “this” being Gibb’s phenomenon (https://en.wikipedia.org/wiki/Gibbs_phenomenon)), but chances are high that isn’t happen, either. Edit: https://www.comsol.com/blogs/happy-birthday-joseph-fourier/ has more info. If he did a thesis defense (did he?), I guess there’s a decent chance Laplace and Lagrange (his supervisor, according to https://www.genealogy.math.ndsu.nodak.edu/id.php?id=17981) were there. Legendre seems doubtful. Weirdly, Legendre doesn’t seem to exist in the Mathematics Genealogy Project. Edit 2: https://www.gutenberg.org/files/16775/16775-h/16775-h.htm#PART_PLAYED_… (by https://en.wikipedia.org/wiki/François_Arago, who was only 18 years younger than Fourier) is the best I can find on this. It says: “The first memoir of Fourier on the theory of heat dates from the year 1807. The Academy, to which it was communicated, being desirous of inducing the author to extend and improve his researches, made the question of the propagation of heat the subject of the great mathematical prize which was to be awarded in the beginning of the year 1812. Fourier did, in effect, compete, and his memoir was crowned. But, alas! as…

What about a hybrid approach, as I think folks do right now more or less -- draw it out by eye, and then validate the design with simulation-software (e.g. https://www.comsol.com/microfluidics-module) and iterate as needed from thereon. Your inclination toward a computational approach makes me think of what folks in mechanical engineering are up to these days. Creating mechanical designs generatively with topological optimization (https://all3dp.com/2/topology-optimization-simply-explained/). There appear to be clear use-cases and advantages: you reduce the amount of material needed, decide exactly what stress points you want to focus on and work to strengthen those particular parts of the structure in interesting ways, etc. Fluid mechanics is a little more complicated though I think, so you're certainly up for a challenge! I wish you success with your proposal, and I hope to discover your findings published in a nature paper on the frontpage of HN sometime soon ;).

> those "Mandala" images Chladni Plates? A few links from past research: https://www.comsol.com/blogs/how-do-chladni-plates-make-it-possible-to… Video example - https://www.youtube.com/watch?v=dPTnGEEoFf4 https://www.youtube.com/watch?v=CR_XL192wXw interactive version - https://www.dynamicmath.xyz/calculus/chladni-patterns/ https://www.youtube.com/watch?v=tFAcYruShow

> and getting the next better thing... Implying an improvement, like phased array semiconductor microwaves, or something like that. Edit: Don't laugh, that actually was 'on the radar' about 10 years ago. IIRC the availability of the parts went away because the producing company has been bought by another, shifted goals, whatnot else. Anyways, no Sci-Fi: https://patents.google.com/patent/CN202733981U/en https://reviewed.usatoday.com/ovens/news/freescale-semiconductor-sage-… Edit: https://www.microwaves101.com/encyclopedias/solid-state-microave-ovens https://www.comsol.com/blogs/optimizing-microwave-ovens-with-solid-sta… https://community.nxp.com/t5/NXP-Designs-Knowledge-Base/Solid-State-Mi… https://www.nxp.com/company/blog/how-to-build-a-better-microwave-oven-… https://www.electronicsweekly.com/news/design/the-future-of-microwave-…