Type of Talk: TACC seminar

Speaker Name:

Victor Eijkhout and Jason Kurtz

Speaker Affiliation: TACC and ICES<

br>
Date: October 13 2006

Start Time: 10:00a.m.

Locatio

n: J.J. Pickle Research Campus Commons Bldg CMS 1.142

Host: Robe

rt van de Geijn

Talk Title: Sparse Direct Factorizations Based on U

nassembled Hyper-Matrices

Talk Abstract:
For dynamic Finite Eleme

nt Method applications existing
sparse direct solvers can be said to s

olve the wrong problem.
They optimize the solution of a single linear s

ystem while
the real problem is to solve a series of systems that are

derived from gradual h/p refinement of a FEM discretization.
We pro

pose a new type of direct sparse solver that is able
to reuse the parts
of the factorization corresponding to
the not refined parts of the dom

ain. Such a solver is eminently
suited to the dynamic case and we will
present evidence
that even for a single system it is space and time ef

ficient.
Furthermore it integrates in a natural way in the workflow of the dynamic application.

neering and Sciences.