Qualifying Exam

Qualifying Exam

A Novel Discretization and Numerical Solver for Non-Fourier Diffusion

 

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Tuesday, October 06, 2020, 03:00pm - 04:30pm

 

Speaker: Haozhe Su

Location : Remote via Webex

Committee

Prof. Mridul Aanjaneya 

Prof. Mario Szegedy

Prof. Jingjin Yu

Prof. He Zhu

Event Type: Qualifying Exam

Abstract: We introduce the C-F diffusion model [Andreson and Tamma 2006; Xue et al. 2018] to computer graphics for diffusion-driven problems that has several attractive properties: (a) it fundamentally explains diffusion from the perspective of the non-equilibrium statistical mechanical Boltzmann Transport Equation, (b) it allows for a finite propagation speed for diffusion, in contrast to the widely employed Fick's/Fourier's law, and (c) it can capture some of the most characteristic visual aspects of diffusion-driven physics, such as hydrogel swelling, limited diffusive domain for smoke flow, snowflake and dendrite formation, that span from Fourier-type to non-Fourier-type diffusive phenomena. We propose a unified convection-diffusion formulation using this model that treats both the diffusive quantity and its associated flux as the primary unknowns, and that recovers the traditional Fourier-type diffusion as a limiting case. We design a novel semi-implicit discretization for this formulation on staggered MAC grids and a geometric Multigrid-preconditioned Conjugate Gradients solver for efficient numerical solution. To highlight the efficacy of our method, we demonstrate end-to-end examples of elastic porous media simulated with the Material Point Method (MPM), and diffusion-driven Eulerian incompressible fluids.

 

Meeting number (access code): 120 774 4059

Meeting password: mtX9VmmN2u9

Host key: 908707