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A parallel version of the preconditioned conjugate gradient method for boundary element equationsPester, M., Rjasanow, S. 30 October 1998 (has links)
The parallel version of precondition techniques is developed for
matrices arising from the Galerkin boundary element method for
two-dimensional domains with Dirichlet boundary conditions.
Results were obtained for implementations on a transputer network
as well as on an nCUBE-2 parallel computer showing that iterative
solution methods are very well suited for a MIMD computer. A
comparison of numerical results for iterative and direct solution
methods is presented and underlines the superiority of iterative
methods for large systems.
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Parallel Multilevel Preconditioners for Problems of Thin Smooth ShellsThess, M. 30 October 1998 (has links)
In the last years multilevel preconditioners like BPX became more and more
popular for solving second-order elliptic finite element discretizations by iterative
methods. P. Oswald has adapted these methods for discretizations of the fourth
order biharmonic problem by rectangular conforming Bogner-Fox-Schmidt elements
and nonconforming Adini elements and has derived optimal estimates for the
condition numbers of the preconditioned linear systems. In this paper we generalize
the results from Oswald to the construction of BPX and Multilevel Diagonal
Scaling (MDS-BPX) preconditioners for the elasticity problem of thin smooth shells of
arbitrary forms where we use Koiter's equations of equilibrium for an homogeneous
and isotropic thin shell, clamped on a part of its boundary and loaded by a
resultant on its middle surface. We use the two discretizations mentioned above and the
preconditioned conjugate gradient method as iterative method. The parallelization
concept is based on a non-overlapping domain decomposition data structure. We
describe the implementations of the multilevel preconditioners. Finally, we show
numerical results for some classes of shells like plates, cylinders, and hyperboloids.
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