Catchwater The Game Interactive Particle-Based Fluid Simulation Modeling Water Flow Through Pipes

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Catchwater The GameInteractive Particle-Based
Fluid Simulation Modeling Water Flow Through Pipes

• Ken Brooks and Brian Clipp
• May 9, 2006

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The Game
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Demonstration
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Pipe Section Modeling
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Sliced Cylinders
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Catchers

• Square at top, round at bottom
• Interpolate in 4 strips per edge

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Modeling the Structure

• 24 possible orientations of a pipe
• How do its connectors connect?
• Solution
• Have a unit vector for each connector
• Keep a quaternion per pipe
• Maintained as user rotates while placing
• Multiply by that quaternion for true direction

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Pipe connector data

• Tee
• 0, 1, 0 (up connector)
• 1, 0, 0 (right connector)
• 0, -1, 0 (down connector)

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Smoothed Particle Hydrodynamics
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Fluid Dynamics
Conservation of Mass
Conservation of Momentum
Particle Accelerations
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Pressure, Visosity and Surface Tension Forces
Particle Density Calculation
Pressure Force Calculation
Color Field
Surface Tension Force
Viscosity Force Calculation
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From Particles to Pipes

• Particle simulation is inefficient for horizontal
  flow
• Capture and count particles at inflow
• Generate particles at outflow

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User Interface Experience

• Particle simulation is beautiful!
• Free viewpoint movement is vital
• ESDFWR are effective rotation controls
• Not very satisfactory position controls