The best known tornado simulation has a small anti-cyclone on the side. The narrator describes it as “a rarely see anit-cyclone.” Having asked many time whether it ever has been seen, the answer seems to be “not yet.” Clearly the one in the visualization is an artifact from an imperfect model.
One other comment. It used to be the case that in computer graphics if something looked OK that was sufficient. That’s no longer true. With the present computer power in GPUs, pretty every special effect you see in a movie is a physically-based simulation. Recent game engines come pretty close to that too. Ed _______________________ Ed Angel Founding Director, Art, Research, Technology and Science Laboratory (ARTS Lab) Professor Emeritus of Computer Science, University of New Mexico 1017 Sierra Pinon Santa Fe, NM 87501 505-984-0136 (home) an...@cs.unm.edu <mailto:an...@cs.unm.edu> 505-453-4944 (cell) http://www.cs.unm.edu/~angel <http://www.cs.unm.edu/~angel> > On May 13, 2020, at 9:44 PM, <thompnicks...@gmail.com> > <thompnicks...@gmail.com> wrote: > > Frank, > I think that was the one that depicted tornadoes as arising from a horizontal > barrel roll being bulged upward in the middle and ultimately split into two > vortexes, one clockwise one, counter. This idea does explain why sometimes a > weak anti-cyclonic tornado often appear next to a main cyclonic one. But > the idea did seem kind of rinky-dink to me. You are right, of course, I had > no way to visit the math and evaluate it > > Nick > > Nicholas Thompson > Emeritus Professor of Ethology and Psychology > Clark University > thompnicks...@gmail.com <mailto:thompnicks...@gmail.com> > https://wordpress.clarku.edu/nthompson/ > <https://wordpress.clarku.edu/nthompson/> > > > From: Friam <friam-boun...@redfish.com> On Behalf Of Frank Wimberly > Sent: Wednesday, May 13, 2020 9:31 PM > To: The Friday Morning Applied Complexity Coffee Group <friam@redfish.com> > Subject: Re: [FRIAM] PSC Tornado Visualization (2008) [720p] - YouTube > > The fluid dynamics model used for that visualization is based on first > principles. Many years ago Nick was trying to figure out how tornadoes > develop. I told him I thought this was pretty well understood and I asked > Droegemeier for a paper. He sent one which I forwarded to Nick. It was full > of advanced math. > > Frank > > --- > Frank C. Wimberly > 140 Calle Ojo Feliz, > Santa Fe, NM 87505 > > 505 670-9918 > Santa Fe, NM > > On Wed, May 13, 2020, 9:23 PM Marcus Daniels <mar...@snoutfarm.com > <mailto:mar...@snoutfarm.com>> wrote: >> Nick writes: >> >> “The result looks so much like iconic tornado vids that we wannabee tornado >> chasers idolize that one suspects that the video was back constructed from >> that film, rather than developing organically from the physics.” >> Suppose the equations were extracted, or the behavior re-generated, from a >> deep neural net (or whatever automated machine learning thing), but >> nonetheless were predictive of other tornados. One might reasonably ask, >> “Who cares?” >> Marcus >> .-. .- -. -.. --- -- -..-. -.. --- - ... -..-. .- -. -.. -..-. -.. .- ... >> .... . ... >> FRIAM Applied Complexity Group listserv >> Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam >> <http://bit.ly/virtualfriam> >> unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> <http://redfish.com/mailman/listinfo/friam_redfish.com> >> archives: http://friam.471366.n2.nabble.com/ >> <http://friam.471366.n2.nabble.com/> >> FRIAM-COMIC http://friam-comic.blogspot.com/ >> <http://friam-comic.blogspot.com/>.-. .- -. -.. --- -- -..-. -.. --- - ... >> -..-. .- -. -.. -..-. -.. .- ... .... . ... > FRIAM Applied Complexity Group listserv > Zoom Fridays 9:30a-12p Mtn GMT-6 bit.ly/virtualfriam > unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com > archives: http://friam.471366.n2.nabble.com/ > FRIAM-COMIC http://friam-comic.blogspot.com/
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