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An Efficient and Exponentially Accurate Parallel
h-p
Spectral Element Method for Elliptic Problems on Polygonal Domains - The Dirichlet Case
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An Efficient and Exponentially Accurate Parallel h-p Spectral Element Method for Elliptic Problems on Polygonal Domains - The Dirichlet Case
S. K. Tomar7 , P. Dutt8 and B. V. Rathish Kumar8 
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Faculty of Mathematical Sciences, University of Twente, P.O. Box 217, 7500 Enschede, AE, The Netherlands |
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Department of Mathematics, IIT Kanpur, 208016 UP, India |
Abstract
For smooth problems spectral element methods (SEM) exhibit exponential convergence and have been very successfully used in
practical problems. However, in many engineering and scientific applications we frequently encounter the numerical solutions
of elliptic boundary value problems in non-smooth domains which give rise to singularities in the solution. In such cases
the accuracy of the solution obtained by SEM deteriorates and they offer no advantages over low order methods. A new Parallel
h-p Spectral Element Method is presented which resolves this form of singularity by employing a geometric mesh in the neighborhood of the corners and gives exponential convergence with asymptotically faster results than conventional
methods. The normal equations are solved by the Preconditioned Conjugate Gradient (PCG) method. Except for the assemblage of the resulting solution vector, all computations are done on the element level
and we don’t need to compute and store mass and stiffness like matrices. The technique to compute the preconditioner is quite simple and very easy to implement. The method is based
on a parallel computer with distributed memory and the library used for message passing is MPI. Load balancing issues are discussed and the communication involved among the processors is shown to be quite small.
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