Transcript On Time Visualization of Simulations in OpenSees With VEES

On Time Visualization of
Simulations in OpenSees
With VEES
Alisa Neeman
Boris Jeremić
Alex Pang
• Motivation
– Simulations take a long time to run
– We’d 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
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
pace Costs:
– 231 elements
– majority being soil elements with a template material
that simulates a variety of classic and advanced
constitutive models
– binary data
1 time step
1000 time steps
40000 time steps
7.5 MB
~7.5 GB
~300 GB
– Future: zlib can reduce size one order of magnitude
• Performance:
– 4 frames per second for 231 (mostly soil) elements
– View in stride? (every 10th step)
• New Visualization Stuff
– Set color scale, keep same scale for all time steps
– Components of stress tensor (σii)/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