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Friday, February 08

Simulation of Complex Nonlinear Elastic Bodies
Using Lattice Deformers

Taylor C. Patterson, University of Wisconsin, Madison
Computer Science Research Group Seminar
10:00 AM — 11:00 AM, Research Office Building (5700), Room L-204
Contact: Jay Jay Billings (Billingsjj@ornl.gov), 865.241.6308

Abstract

Lattice deformers are a popular option in computer graphics for modeling the behavior of elastic bodies as they avoid the need for conforming mesh generation, and their regular structure offers significant opportunities for performance optimizations. This talk will present work that expands the scope of current grid-based elastic deformers, adding support for a number of important simulation features. The approach to be described accommodates complex nonlinear, optionally anisotropic materials while using an economical one-point quadrature scheme. The formulation fully accommodates near-incompressibility by enforcing accurate nonlinear constraints, supports implicit integration for large time steps, and is not susceptible to locking or poor conditioning of the discrete equations. Additionally, this technique increases the solver accuracy by employing a novel high-order quadrature scheme on lattice cells overlapping with the embedded model boundary, which are treated at sub-cell precision. This accurate boundary treatment can be implemented at a minimal computational premium over the cost of a voxel-accurate discretization. Finally, this talk will present part of the expanding feature set of this approach that is currently under development.