I also put an updated version of the paper tlanalysis.ps.gz. A two-level analysis method for certain separable problems is introduced. It motivates the definition of improved versions of Black Box Multigrid for diffusion problems with discontinuous coefficients and indefinite Helmholtz equations. For anisotropic problems, it helps in choosing suitable implementations for frequency decomposition multigrid methods. For highly indefinite problems, it provides a way to choose a suitable mesh size for the coarsest grid used.
Numerical experiments confirm the analysis and show the advantage of the present methods.
UG is a flexible software library for the development of adaptive multigrid methods on unstructured meshes. The main idea of UG was to implement most parts in a problem-independent way, so that the software can be reused for many different applications. UG is available for free for all non-profit organizations. The Louisiana Tech University will host a 5-day CFD short course in the summer of 1996. Several advanced teaching and research codes for incompressible flow, direct numerical simulation for flow transition, and numerical combustion with detailed chemistry will be described and distributed to all attendants for free.