On Time Visualization of Simulations in OpenSees With VEES

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On Time Visualization of Simulations in
OpenSeesWith VEES

• Alisa Neeman
• Boris Jeremic
• Alex Pang

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• Motivation
• Simulations take a long time to run
• Wed like to be able to watch them quickly,
  though
• Replay entire experiment
• Go to specific points in experiment and examine
  constitutive state
• DVD player plus visualization application

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• Ingredients
• VEES
• Visualizer that rides onto OpenSees
• OpenSees
• sendSelf interface originally designed to assist
  with parallelization by serializing objects to
  send to other compute nodes.
• we use it instead to capture state on each
  commit.
• Recorder class and Channel class DomainRecorder,
  File_Chaneel

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• Space Costs
• 231 elements
• majority being soil elements with a template
  material that simulates a variety of classic and
  advanced constitutive models
• binary data
• Future zlib can reduce size one order of
  magnitude

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• Performance
• 4 frames per second for 231 (mostly soil)
  elements
• View in stride? (every 10th step)

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• New Visualization Stuff
• Set color scale, keep same scale for all time
  steps
• Components of stress tensor (sii)/3
• Stiffness tensor for 3D materials
• Take a rubber sphere and stretch/squash it by
  stiffness
• Eijklninjnknl where n is a vector of length 1
  from the sphere origin to the surface
• Future
• Tensor components of Eijkl (eigentensors)
• Continuous representation of stiffness