Evolving Sub-Grid Turbulence for Smoke Animation

Schechter, Hagit; Bridson, Robert

Evolving Sub-Grid Turbulence for Smoke Animation

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001-007.pdf (210.17 KB)

schechter_sca08_subgrid_turbulence.mov (57.09 MB)

Date

2008

Authors

Schechter, Hagit
Bridson, Robert

Publisher

The Eurographics Association

Abstract

We introduce a simple turbulence model for smoke animation, qualitatively capturing the transport, diffusion, and spectral cascade of turbulent energy unresolved on a typical simulation grid. We track the mean kinetic energy per octave of turbulence in each grid cell, and a novel 'net rotation' variable for modeling the self-advection of turbulent eddies. These additions to a standard fluid solver drive a procedural post-process, layering plausible dynamically evolving turbulent details on top of the large-scale simulated motion. Finally, to make the most of the simulation grid before jumping to procedural sub-grid models, we propose a new multistep predictor to alleviate the nonphysical dissipation of angular momentum in standard graphics fluid solvers.

        @inproceedings{:10.2312/SCA/SCA08/001-007
,
booktitle = {Eurographics/SIGGRAPH Symposium on Computer Animation
},
editor = {Markus Gross and Doug James
},
title = {{Evolving Sub-Grid Turbulence for Smoke Animation
}},
author = {Schechter, Hagit and 
Bridson, Robert
},
year = {2008
},
publisher = {The Eurographics Association
},
ISSN = {1727-5288
},
ISBN = {978-3-905674-10-1
},
DOI = {/10.2312/SCA/SCA08/001-007
}
}