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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

Interesting papers on SIGGRAPH 2005

Korea University

Computer Graphics Lab.

Jin-Kyung Hong

a vortex particle method for smoke water and explosions

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)

summary
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
results 1 2
Results (1/2)
  • Turbulence in water flowing (320x128x320)
results 2 2
Results (2/2)
  • Smoke explosion (180x260x180)
animating gases with hybrid meshes

Animating Gases with Hybrid Meshes

Bryan E. Feldman

James F. O’Brien

Bryan M. Klingner

(University of California, Berkeley)

overview 1 2
Overview (1/2)
  • Keywords
    • Natural phenomena, physically based animation, CFD
overview 2 2
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
method 1 2
Method (1/2)
  • Discretization
    • Regular grids smoothly joined to irregular tetrahedral
method 2 2
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
animating sand as a fluid

Animating Sand as a Fluid

Yongning Zhu

Robert Bridson

summary13
Summary
  • Keywords
    • Sand, water, animation, physical simulation
  • Existing fluid solver  granular materials
  • Sand modeling
    • Friction
  • Fluid simulation
  • Surface reconstruction from particles
results 1 3
Results (1/3)
  • As water and as sand (100x100x100)

< with zero boundary friction >

results 2 3
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 >

flip vs pic
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>

results 3 3
Results (3/3)
  • Granular material (100x60x60)