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Interesting papers on SIGGRAPH 2005

Interesting papers on SIGGRAPH 2005. Korea University Computer Graphics Lab. Jin-Kyung Hong. A Vortex Particle Method for Smoke, Water and Explosions. Andres Sell (Stanford University and Intel Corporation) Nick Rasmussen (Industrial Light & Magic)

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Interesting papers on SIGGRAPH 2005

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  1. Interesting papers on SIGGRAPH 2005 Korea University Computer Graphics Lab. Jin-Kyung Hong

  2. A Vortex Particle Method for Smoke, Water and Explosions Andres Sell (Stanford University and Intel Corporation) Nick Rasmussen (Industrial Light & Magic) Ron Fedkiw (Stanford University and Industrial Light & Magic)

  3. Summary • Keywords • Vortex methods, fluids, smoke, water, explosions • Highly turbulent effects • Grid based method • Uniform or octree grid • Vortex particle method • Eliminate dissipation, Increase details • Vorticity forcing • Grid based velocity field towards the desired vorticity

  4. Results (1/2) • Turbulence in water flowing (320x128x320)

  5. Results (2/2) • Smoke explosion (180x260x180)

  6. Animating Gases with Hybrid Meshes Bryan E. Feldman James F. O’Brien Bryan M. Klingner (University of California, Berkeley)

  7. Overview (1/2) • Keywords • Natural phenomena, physically based animation, CFD

  8. Overview (2/2) • Animating gases • on unstructured tetrahedral meshes • the interaction of the fluids with irregularly shaped obstacles • Hybrid mesh • Combine tetrahedral cells with regular hexahedral cells • Naturally suited to behavior at curved or angled boundaries • Accuracy near obstacles • Efficiency in open regions

  9. Method (1/2) • Discretization • Regular grids smoothly joined to irregular tetrahedral

  10. Method (2/2) • Accelerations due to Body Forces • Gravity, vorticity confinement • Semi-Lagrangian integration • Mass Conservation • Open boundary, closed boundary • Interpolation • Regular hexahedral cells • Tetrahedral and transition cells

  11. Results

  12. Animating Sand as a Fluid Yongning Zhu Robert Bridson

  13. Summary • Keywords • Sand, water, animation, physical simulation • Existing fluid solver  granular materials • Sand modeling • Friction • Fluid simulation • Surface reconstruction from particles

  14. Results (1/3) • As water and as sand (100x100x100) < with zero boundary friction >

  15. Results (2/3) • Compare to previous one • Friction coefficient • between the sand and other objects • e.g. solid wall boundaries < with a boundary friction coeff. = 0.6 >

  16. FLIP vs. PIC • FLIP: Fluid Implicit-Particle • Small-scale velocities preserved • Inviscid flows, water • PIC: Particle-in-Cell • Smoothed away • Viscous flows, sand <PIC> <FLIP>

  17. Results (3/3) • Granular material (100x60x60)

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