Scientific Computing Seminar

Date:

Friday, February 10, 2006

Time:

1:00pm-2:00pm

Location:

50A-5132

Seminar Speaker:

Steven L. Lee
Lawrence Livermore National Laboratory
Center for Applied Scientific Computing
Numerical Methods Group
http://www.llnl.gov/CASC/people/slee/

Title:

Teleprojective integrators for stiff multiscale problems

Abstract:

Projective integrators are a new class of explicit methods that efficiently exploit the multiscale features that are characteristic of stiff problems. We introduce projective versions of second-order accurate Runge-Kutta and Adams-Bashforth methods, and demonstrate their use as fully explicit integrators for solving stiff initial value problems. We also describe our development of a novel "telescoping" technique that preconditions the stiff system on-the-fly so that we instead solve an equivalent, nonstiff system.

This technical approach has significant benefits for petascale computing because the integrators are designed to scale well on massively parallel machines. Projective integrators are also a cornerstone for enabling the Equation-Free and Heterogeneous Multiscale Method frameworks for solving atomistic-macroscopic problems.

Sponsor of Seminar:

Esmond Ng

Scientific Computing

Contact Esmond G. Ng EGNg@lbl.gov