[FRIAM] PSC Tornado Visualization (2008) [720p] - YouTube

[Edward Angel]

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)		 	angel at cs.unm.edu <mailto:angel at 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, <thompnickson2 at gmail.com> <thompnickson2 at 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
> ThompNickSon2 at gmail.com <mailto:ThompNickSon2 at gmail.com>
> https://wordpress.clarku.edu/nthompson/ <https://wordpress.clarku.edu/nthompson/>
>  
>  
> From: Friam <friam-bounces at redfish.com> On Behalf Of Frank Wimberly
> Sent: Wednesday, May 13, 2020 9:31 PM
> To: The Friday Morning Applied Complexity Coffee Group <friam at 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 <marcus at snoutfarm.com <mailto:marcus at 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
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