Physically Animated Fire

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Physically Animated Fire

• By Chris Lower

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Introduction

• Fire, Water, Tornadoes, Aura borealis.
• Such phenomena are hard to model due to the
  complexity of the interactions.
• For this reason it is very important to study the
  phenomena that you intend to model closely and
  study the reactions between different elements of
  that phenomena.

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Intro. (Cont)

• Accomplishing this task is very important
• Movies
• Games
• Simulations ex. Firefighters. Other highly
  explosive clean up crews.

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Summary of Topic

• When we think of fire we should envision in our
  minds three parts the blue core, the black body
  radiation, and the gaseous smoke. In this
  presentation I will only discuss the first two.
• Blue Core- The blue core is found at the bottom
  of the flame. It is produced by carbon radicals.
  When the carbon is burned produces this spectrum
  of color.

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Summary of Topic(cont)

• The Black Body Radiation This is what the
  majority of people associate with a flame. This
  consist of the actual yellow-orange color that is
  produced in a vertical fashion. This color is
  caused by carbon soot.

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Modeling the Blue Core

• The blue core is directly influenced by the fuel
  used in the reaction. To model the blue core we
  will need to know the ratio of fuel used to
  product.

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Modeling Blue Core(cont)

• The equation used to model the blue core v f
  Af SAS
• When we increase the S value we see an increase
  in the turbulence.
• For most flames an s value of .5m/s is used

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Modeling Black Body Radiation

• When modeling Black body radiation it is very
  important to keep up with temperature tables.
• Temperature histories allow you to model the
  amount of product to fuel.

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Modeling Black Body Radiation(cont)

• If you know the temperature, then you can figure
  out the amount of fuel that is being consumed.
  The higher the temp the more fuel being used.
• It will reach a peak and then begin to dissipate
  and reach 0.
• Once it has reached 0 there will no longer be any
  visible yellow-orange.

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Conclusion

• Several factors much be taken into consideration.
  Ex. Solid Fuel, Gaseous Fuel, Temperature,
  Record of product to fuel.
• All these factors are necessary when trying to
  model the blue core, and the black body radiation.

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References
Chu, Nelson, and Tai, Chiew. 2002. MoXi
Real-Time Ink Dispersion in Absorben Paper.
Eastern Ink Painting, Fluid Simulation, Lattice
Boltzmann Equation, Physically-Based
Modeling Gager, Willi, Ronald Fedkiw, Duc
Nyguyen, Nick Rasmussen. 2003 Smoke
Simulation.For Large Scale Phenomena. I.3.5
Computer Graphics Computational Geometry and
Object Modeling.Physically based modeling Haber,
Jorg, Magnore, Marcus and Seidel Hans-Peter.
2005. Physically-Based Simulation of Twilight
Phenomena Found ACM transactions of Graphics,
Vol. 24, NO.4, Octorber 2005, Pages 1353-1373
Jensen, Henrik, Ronald Fedkiw, Duc Nyguyen.
2002. Physically Based Modeling and Animation
of Fire. I.3.5 Computer Graphics Geometry
and object Modeling Physically based modeling