Perpetual Visualization of Particle
Motion and Fluid Flow
Presented by Tsui Mei Chang
Objectives
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Definition of fluid
Introduction of particle systems
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Free Form
Mesh
Cell
Fluids
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Known as a gas, liquid, or plasma
Physical phenomena that are well suited to
particle system modeling
Specifically interested in motion
Fluids in Motion
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Represent more realistic scenes
Simulation
Navier-Stokes equations
Graphically fluid motion is more broadly
defined and not limited to physical definition
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Cloth, hair, flocking
Navier-Stokes Equations
Conservation of Mass
Change in velocity field
Particle Systems
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Collection of particles
Useful for objects that obey the laws of
physics
Individually store physical characteristics and
rendering attributes
Track particles separately
Free Form
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Particle movement independent of other
particles
Subject to external forces
Well suited to randomized lifetimes
Simplified force equations
Examples: Fireworks, sparklers, fountains
Mesh
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Particles form the vertices of a grid,
connected or not
Captures affect of external and internal forces
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Spring forces
Time and space trade off
Examples: Flags, surface tracing
“Free form” Cell
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Combines freedom of random particles and
internal forces of mesh
Track only particles in a specific cell
Internal forces from particles in cell and
adjacent cells
Examples: Smoke, rivers, contained liquids
Addition Algorithms
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Collisions: detection and response
Moving around Objects
State change