Twisters in Motion

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Twisters in Motion

• COMP 768 Physically-Based Modeling, Animation,
• and Simulation

Final Project Proposal
By Michael Su
03/05/2009
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Motivation

• Movie special effects Twister

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Introductions

• Tornado formation
• Tornado structure
• Size Avg. 500 feet across,
• stay on the ground for 5 miles
• Color Depend on the lighting
• condition
• Large Rossby number (inertial
• and centrifugal forces dominate)
• Sound Audible when its close
• Measure EF0EF5

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Prior Arts

• Real time simulation of a tornado by Shiguang
  Liu, Zhangye Wang, Zheng Gong, Qunsheng Peng
• Pyhsically based simulation of tornadoes by Ding
• Physically based modeling and animation of
  tornado by Liu, S., Wang, Z., Gong, Z., Chen, F.,
  Peng, Q.
• Effects of Fine-Scale Debris on Near-Surface
  Tornado Dynamics by D. C. Lewelleny, Baiyun Gong,
  and W. S. Lewellen

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Challenges

• Complicated formation processes
• Unstable air flow mixed with debris cloud
• Large scale simulation
• Chaos appearance
• Performance requirement

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Goal

• Simulate the tornado formation
• Tornado evolution
• Tornado rigid-body object interaction

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Tentative Approach

• Implement the two-fluid model for the air flow
  and the debris flow using grid-based approach
• May try to use SPH (Smoothed Particle
  Hydrodynamics) approach for the debris flow.

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Time Table
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Potential Extensions

• Tornado-deformation objects interaction
• Tornado-fracture interaction
• Rendering the tornado
• Port the code onto GPU

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Reference

• http//serc.carleton.edu/NAGTWorkshops/visualizati
  on/collections/tornados.html
• http//eiger.mae.wvu.edu/tornado.html