Send mail to:    mgnet@cs.yale.edu             for the digests or bakeoff
                  mgnet-requests@cs.yale.edu    for comments or help
 Current editor:  Craig Douglas                 douglas-craig@cs.yale.edu
Anonymous ftp repository:    ftp.ccs.uky.edu (128.163.209.106)

World Wide Web:  http://www.mgnet.org or
                 http://www.cerfacs.fr/~douglas/mgnet.html or
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                 http://www.ccs.uky.edu/mgnet

Today's editor:  Craig Douglas (douglas-craig@cs.yale.edu)

Volume 8, Number 9 (approximately September 30, 1998)

Today's topics:

     www.mgnet.org Machine
     DD11 Proceedings
     EMG 99
     More Efficient Parallelizable MUDPACK
     Paper on Parallel MGM
     2 Preprints by Bittencourt, Douglas, and Feijoo

-------------------------------------------------------

Date: Thu, 01 Oct 1998 14:42:12 -0200
From: Craig Douglas 
Subject: www.mgnet.org Machine

The computer that www.mgnet.org aliases to has been upgraded to a much, much
faster computer.  Hopefully, this will relieve some of the problems that have
been reported.  Currently, anonymous ftp is not on.  I may turn it back on
when I return from the GAMM Workshop on Parallel Multigrid Methods that will
be held in the coming week.

Please access this machine using your favorite web browser for the time being.

-------------------------------------------------------

Date: Thu, 10 Sep 1998 15:01:54 +0100
From: 
Subject: DD11 Proceedings

The deadline for paper submission is October 31st 1998.  Please see more
details on http://dd11.gre.ac.uk/proceedings.html or simply go to the final
announcement and click on the section 'Proceedings'.

A conference report can also be found in European Mathematical Society
Newsletter, Issue 29, September 1998.

DD11 Local Organising Committee

-------------------------------------------------------

Date: Fri, 18 Sep 1998 09:48:24 +0000
From: erik.dick@rug.ac.be
Subject: EMG 99

PRELIMINARY ANNOUNCEMENT

Sixth European Multigrid Conference

September 27-30, 1999
Universiteit GENT, BELGIUM

The department of Flow, Heat and Combustion Mechanics of the University of
Ghent is organising the European Multigrid Conference `99.  Earlier
conferences were held in Cologne in 1981 and 1985, in Bonn in 1990, in
Amsterdam in 1993 and in Stuttgart in 1996.

Conference themes will concern all aspects of multigrid methods:  theory and
applications.

The conference will be held in the conference centre of the University of
Ghent, located in the historic heart of the city.  The conference fee is
expected to be around 300 Euro (350 US$), including admission to all sessions,
lunches, coffee breaks, reception, conference dinner, excursion and the book
of abstracts.

Following the tradition of the conference, invited lectures and selected
presentations will appear as full papers in the conference proceedings, to be
published by Springer or Birkhauser.  Academia Press Ghent will publish the
remaining presentations.  The proceedings by Springer or Birkhauser will be
offered at reduced price.  The proceedings by Academia Press Ghent are
included in the conference fee.

Contact address:  Prof. E. Dick, Universiteit GENT, Sint-Pietersnieuwstraat 41,
B-9000 GENT, Belgium, Fax:  +32-9-264 35 86, Email:  Erik.Dick@rug.ac.be.

For inclusion on the mailing list, please fill in the form at location
http://allserv.rug.ac.be/~edick/emg.

-------------------------------------------------------

Date: Mon, 21 Sep 1998 08:38:05 -0600 (MDT)
From: johnad@niwot.scd.ucar.edu (John Adams)
Subject: More Efficient Parallelizable MUDPACK

A new version 4.0 of the multigrid software package MUDPACK is now available
on the world wide web.  The web site

  

includes a detailed description and instructions for downloading the source
code after signing software licensing agreement with the University
Corporation for Atmospheric Research.  Since it inception, portions of MUDPACK
have been distributed to hundreds of users from foreign institutions and
within the U.S.  The new version was created to simplify and modernize the
package.  MUDPACK 4.0 has been passed through fortran verification software
and compiled and executed on a variety of platforms with both fortran 77 and
fortran 90.  The resulting streamlining has yielded code which is more
efficient and more amenable to parallelization than the earlier versions.

MUDPACK 4.0 replaces and is incompatible with earlier versions.  The software
includes a suite of portable fortran programs which automatically discretize
and use multigrid techniques to generate second- and fourth-order
approximations to elliptic Partial Differential Equations (PDEs) on
rectangular regions.  The elliptic PDEs can be real or complex in two- and
three-dimensions with any combination of mixed derivate, specified, or
periodic boundary conditions.  Multigrid V or W cycles which use point,
line(s), or planar relaxation and fully weighted residual restriction are
available for algorithm tuning to obtain optimal multigrid performance.
MUDPACK was written to avoid repeated "re-invention of the wheel" in human
code development time which can be at least as important as saving machine
cycles.

-------------------------------------------------------

Date: Sun, 27 Sep 1998 07:28:35 +0800
From: Guo Qingping 
Subject: Paper on Parallel MGM

    Fabled Boundary Condition Forecast Algorithm in Domain Decomposition
                        Multigrid Parallel Computing

                                Guo Qingping
         Wuhan Transportation University, Wuhan 430063, P. R. China
                            qpguo@public.wh.hb.cn
                             guo@dcs.qmw.ac.uk

                                 Yakup Paker
    Queen Mary and Westfield College, University of London, E1 4NS, U.K.
                            paker@dcs.qmw.ac.uk

                               Zhang Shesheng
         Wuhan Transportation University, Wuhan 430063, P. R. China

                              Dennis Parkinson
    Queen Mary and Westfield College, University of London, E1 4NS, U.K.

                                 Wei Jialin
         Wuhan Transportation University, Wuhan 430063, P. R. China

                                  Abstract

We propose a fabled boundary condition forecast algorithm for multigrid
parallel computing, and derive a forecast function formula in this paper.
Numerical results of one and two dimension boundary condition problems
obtained with the algorithm in a PVM network computing environment show that
the algorithm has high parallel efficiency.

Keywords: Multi-Grid, Domain Decomposition, Boundary Condition Forecast

    Editor's Note: This can be found through www.mgnet.org/mgnet-papers.html
    -------------  or mgnet/papers/Qingping-et-al/fablebc.{doc,pdf}.

-------------------------------------------------------

Date: Wed, 30 Sep 1998 11:23:56 -0400 (EDT)
From: Marco Bittencourt 
Subject: 2 Preprints by Bittencourt, Douglas, and Feijoo

                    Adaptive Non-Nested Multigrid Methods

                             Marco L. Bittencourt
                      Center for Computational Sciences
                            University of Kentucky
               325 McVey Hall, Lexington, KY, 40506-0045, USA 
                           e-mail: mlb@ccs.uky.edu

                               Craig C. Douglas
                          Department of Mathematics
                            University of Kentucky
          715 Patterson Office Tower, Lexington, KY, 40506-0027, USA
                         e-mail: douglas@ccs.uky.edu

                                Raul A. Feijoo
          Laboratorio Nacional de Computacao Cientifica (LNCC/CNPq)
        Av. Getulio Vargas 333, CEP 25651-070, Petropolis/RJ, Brazil 
                          e-mail: feij@alpha.lncc.br

                                   Abstract

This paper presents some linear adaptive non-nested multigrid methods which
are applied to linear elastic problems discretized with triangular and
tetrahedral finite elements using unstructured and Delaunay mesh generators.
The Zienkiewicz-Zhu error estimator and a h-refinement procedure are used to
obtain the non-nested meshes used by the multigrid methods.  We solve problems
with a specified percentage error in the energy norm using the optimal
performance of multigrid methods.

                                  * * * * *

               Non-Nested Multigrid Methods for Linear Problems

                             Marco L. Bittencourt
                               Craig C. Douglas
                                Raul A. Feijoo

                                   Abstract

This paper presents an application of non-nested and unstructured multigrid
methods to linear elastic problems.  A variational formulation for transfer
operators and some multigrid strategies, including adaptive algorithms, are
presented.  Expressions for the performance evaluation of multigrid strategies
and its comparison with direct and preconditioned conjugate gradient
algorithms are also presented.  A C++ implementation of the multigrid
algorithms and its quadtree and octree data structures are discussed.  Some
two and three dimensional elasticity examples are analyzed.

    Editor's Note: Both can be found through www.mgnet.org/mgnet-papers.html
    -------------  or mgnet/papers/Bittencourt-Douglas-Feijoo/paper{3,4}.ps.gz.

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End of MGNet Digest
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