eg 1 2. Is it just vorticity? What's actually happening? (Similar: steam engines, volcanoes, clouds).

examples are grid-based, using "vorticity confinement" in Phoenix FD.

EDIT Some techniques: "divergence control" is used to increase the smoke concentration; and fuel particles in the air may combust, further adding smoke at that point (i.e. not at the initial source of the smoke).

A reference: Feldman 2003, Animating Suspended Particle Explosions, ACM Trans. Graph. (Proc. SIGGRAPH) 22 (2003), 708-715

  • $\begingroup$ I don't think that one could tell what was the technique used for in that simulation. In fact, after the simulation was done ther is a whole post-processing for generating those rendered images that might change what you see. $\endgroup$
    – nicoguaro
    May 31 '17 at 15:37
  • 1
    $\begingroup$ Have you taken note of the video description, which suggests either realflow realflow.com or blender docs.blender.org/manual/en/dev/physics/fluid/types/domain.html $\endgroup$
    – origimbo
    Jun 1 '17 at 10:38
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    $\begingroup$ In fact, following the attribution link gives youtube.com/watch?v=joyi-ig6_Kw, which seems to point to chaosgroup.com/phoenix-fd/maya as yet another "realistic" simulator, but a cell based one. $\endgroup$
    – origimbo
    Jun 1 '17 at 13:47
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    $\begingroup$ @hypergallium By simulating just inviscid Euler equation (+gravity), one can create interesting patterns of vortices. See this video of my simulator youtube.com/watch?v=pA5fryVt33o (I'm using a purely Lagrangian particle method, but you can probably do that also with SPH). $\endgroup$
    – BrunoLevy
    Jun 5 '17 at 17:41
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    $\begingroup$ @hypergallium Yes, the fluids are incompressible (forgot to mention it). There are two fluids with different densities, one of them (light, on the bottom) is made invisible to better see the structures in the other one (top, heavier). Incompressibility is enforced by controlling the volumes of Voronoi cells (power diagram), using optimal transport (Merigot-Gallouet scheme). $\endgroup$
    – BrunoLevy
    Jun 6 '17 at 7:43

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