[Colloquium] Reminder: Morgan/Dissertation Defense/Apr 23, 2018

[Margaret Jaffey via Colloquium]

This is a reminder about Hannah Morgan's defense on Monday.

       Department of Computer Science/The University of Chicago

                     *** Dissertation Defense ***


Candidate:  Hannah Morgan

Date:  Monday, April 23, 2018

Time:  3:00 PM

Place:  Ryerson 276

Title: Critical Points in Simulation Technology

Abstract:
Computer simulation is a powerful tool for exploring real-world
processes. Special considerations need to be made at each point to
ensure an accurate and efficient simulation. This thesis focuses on
topics at different points in the simulation process. We present a
finite element algorithm for solving the Stokes system based on the
Scott-Vogelius technique together with the iterated penalty method. By
projecting the Scott-Vogelius pressure onto a continuous function
space, we can recover an accurate, continuous pressure solution while
retaining a divergence-free velocity. This algorithm could be of
particular interest when modeling incompressible complex fluids where
there is a strong dependence on the pressure. Full details of our
implementation in the automated finite element software FEniCS are
described and numerical results are given. Next, we derive a
stochastic performance model for traditional and pipelined Krylov
linear solvers. By using a description that accounts for stochastic
noise, modeled by an analytical probability distribution, we are able
to clarify a folk theorem that pipelined methods can only result in a
speedup of 2× over the naive implementation. Examining repeated runs,
we are also able to study machine noise in depth. These results are
particularly applicable in unpredictable computing environments, such
as computing plat- forms with shared resources. Details of our
experiments in the scientific computing software PETSc are given.

Hannah's advisor is Prof. L. Ridgway Scott

Login to the Computer Science Department website for details,
including a draft copy of the dissertation:

 https://www.cs.uchicago.edu/phd/phd_announcements#hmmorgan

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Margaret P. Jaffey            margaret at cs.uchicago.edu
Department of Computer Science
Student Support Rep (Ry 156)               (773) 702-6011
The University of Chicago      http://www.cs.uchicago.edu
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