Blowing glass with the boundary element method

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Blowing glass with the boundary element method

• Willem Dijkstra
• May 9th, 2007
• Eindhoven

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Problem description
hot air
parison
mould
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History within CASA

• Konstantin Laevsky (PhD thesis 2003)
• Sandra Allaart-Bruin
• Christina Giannopapa (J. of Manufacturing
  Science and Engineering 2007)
• others

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Mathematical model
Glass is viscous fluid ? Stokes equations
Boundary conditions
Time integration
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Boundary Element Method

• Advantages
• Small matrices
• Tracking boundary only

• Disadvantages
• Dense matrices
• Homogeneous fluids only

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Example blowing
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Wall detection
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Wall detection
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Slip conditions
Slip between glass and mould
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Example slip conditions
ß 8
ß 10
ß 6
ß 3
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Example two-stage
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Example bokma bottle
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Example with dent
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Summary

• Full 3D simulation
• Wall detection
• Slip condition

To do

• Improve time integration (e.g. flow method by B.
  Tasic)