CENTER FOR COMPUTATIONAL MATHEMATICS COLLOQUIUM

                  UNIVERSITY OF COLORADO AT DENVER



TITLE:   Geometric and algebraic aspects of MG methods in CFD
 

SPEAKER: Herve Guillard, INRIA, France
         

DATE:    Tuesday, September 2, 1997  (PLEASE NOTE UNUSUAL DAY)


PLACE:   Math Conference Room 626 
         UCD Building, 1250 14th St., Denver


TIME:    1 pm (Refreshments served at 12:45 pm)  (PLEASE NOTE UNUSUAL TIME)



ABSTRACT

On non-structured meshes, MG methods experiences difficulties with the
definition of the coarse levels. We will discuss two ways to deal with 
this problem in the context of CFD computations. 
Algebraic methods rely only on the properties of the linear systems to be 
solved. These methods has proved to be a valuable tool in implicit CFD 
computations and we will describe some of their applications in
aerodynamics.

Concurently, the progresses made in mesh generation and optimization allow
now an effective construction of explicit coarse level meshes in both 2-D 
and 3-D. We will describe some of the coarsening algorithms that can be used
to extract coarse geometric models close from the fine level one.