Perpetual Visualization of Particle Motion and Fluid Flow

Presented by Tsui Mei Chang

Objectives

Definition of fluid Introduction of particle systems

Free Form Mesh Cell

Fluids

Known as a gas, liquid, or plasma Physical phenomena that are well suited to

particle system modeling Specifically interested in motion

Fluids in Motion

Represent more realistic scenes Simulation Navier-Stokes equations Graphically fluid motion is more broadly

defined and not limited to physical definition Cloth, hair, flocking

Navier-Stokes Equations

Conservation of Mass

Change in velocity field

Particle Systems

Collection of particles Useful for objects that obey the laws of

physics Individually store physical characteristics and

rendering attributes Track particles separately

Free Form

Particle movement independent of other particles

Subject to external forces Well suited to randomized lifetimes Simplified force equations Examples: Fireworks, sparklers, fountains

Mesh

Particles form the vertices of a grid, connected or not

Captures affect of external and internal forces Spring forces

Time and space trade off Examples: Flags, surface tracing

“Free form” Cell

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

Collisions: detection and response Moving around Objects State change