Skip to content Skip to navigation

Colloquium: Towards Robust Scalable Algebraic Multigrid Solvers

Event Type: 
Colloquium
Speaker: 
Ray Tuminaro. Sandia National Laboratories
Event Date: 
Thursday, October 27, 2016 -
3:30pm to 4:30pm
Location: 
SMLC 356

Event Description: 

Speaker: Raymond Tuminaro

Title: Towards Robust Scalable Algebraic Multigrid Solvers
 
Abstract:
 
Algebraic multigrid methods are iterative linear solver techniques that have been successfully applied across a range of different application areas. Rapid convergence rates are often obtained if certain algebraic multigrid assumptions are met by the underlying linear systems.  This talk highlights multigrid challenges that arise from applications (e.g., structural dynamics, fluid flow, and electro-magnetics) in situations where standard algebraic multigrid assumptions are not met.
 
The first part of the talk provides multigrid background and focuses on problematic situations for algebraic multigrid, highlighting how assumptions are not satisfied.  The second part of the talk focuses on algebraic multigrid adaptations for two different application scenarios: 1) highly stretched thin meshes arising from ice sheet modeling and 2) discontinuous fields at interfaces arising from a multiphase flow application.  For each example, we demonstrate how each proposed algorithmic adaption addresses a problematic situation while leveraging standard algebraic multigrid techniques/software, making it not too difficult to implement.
 
Coffee and tea will be served in the lounge at 15.00.
 
 

Event Contact

Contact Name: Deborah Sulsky/Stephen Lau