[HN Gopher] Secret Ingredient Found to Power Supernovas (Turbule...
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       Secret Ingredient Found to Power Supernovas (Turbulence)
        
       Author : CapitalistCartr
       Score  : 45 points
       Date   : 2021-01-27 13:29 UTC (9 hours ago)
        
 (HTM) web link (www.quantamagazine.org)
 (TXT) w3m dump (www.quantamagazine.org)
        
       | sparsely wrote:
       | Pretty incredible that the simulations take "many months" to run
       | on what I presume would be a supercomputer of some sort. What
       | sort of resolution are they modelling these events at?
        
         | aardvark179 wrote:
         | Picking one of the linked papers at random they are simulating
         | down to about 500m cubes.
        
           | jetrink wrote:
           | To put that in some sort of perspective, NOAA's highest
           | resolution weather model uses 3000m grids and they are "only"
           | simulating the thin layer of atmosphere over a single
           | continent.
        
             | sandworm101 wrote:
             | But the NOAA's weather grids are probably populated with a
             | greater number of variables. And they have a vertical
             | dimension/gradient that isn't present in the homogenous
             | blocks of material simulated in the stars.
        
               | jetrink wrote:
               | I only mean to point out that 500m is quite detailed,
               | particularly in terms of the vast scale of a star. I
               | wasn't commenting on the relative sophistication of the
               | models or anything like that.
        
       | Robotbeat wrote:
       | The secret ingredient is turbulence (which shows up in 3
       | dimensional flow models but not the simple 1D models that were
       | used in the past). Maybe this can be added to the title to make
       | it less clickbaity?
        
         | CapitalistCartr wrote:
         | OK, I updated it.
        
       | peteradio wrote:
       | Cow hypothesizers find updated modelling to include legs yields
       | richer behavior and answers previously unexplained results.
        
         | CapitalistCartr wrote:
         | Cows are spherical.
        
           | [deleted]
        
           | KMag wrote:
           | That reminds me of an old joke about a Physics professor at
           | the horse races. He modeled the horses as perfect spheres
           | starting at rest, and the racetrack as a perfectly smooth
           | infinite plane. To a first order approximation, none of the
           | horses are able to finish the race.
        
           | TeMPOraL wrote:
           | The research described in the article is in fact about how
           | spherical cows have _peristalsis_ [0] which explain some
           | facets of their behavior.
           | 
           | --
           | 
           | [0] - https://en.wikipedia.org/wiki/Peristalsis
        
       | magicalhippo wrote:
       | As far as I can determine, this[1] is an older video from the
       | paper[2] linked in the article, showing the first hundred
       | milliseconds.
       | 
       | Also found this[3] presentation by Adam Burrows, also mentioned
       | in the article, giving an overview on the 3D simulations compared
       | to the older 1D and 2D simulations.
       | 
       | [1]: https://www.youtube.com/watch?v=oxGajNoPz8c
       | 
       | [2]: https://arxiv.org/abs/1503.02199
       | 
       | [3]: https://www.youtube.com/watch?v=ZDk5AzmNCCk
        
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       (page generated 2021-01-27 23:02 UTC)