Abstract
We report on numerical investigations which were made in the development of the code SIHEM (SImulation of HEating processes in Metals). In SIHEM the associated nonlinear parabolic problem (2D-space variables) is treated by a combination of simple (low order) space and implicit time discretizations (Crank-Nicolson) with a time step size control, Newton's or a Newton-like linearization and the use of Fast Elliptic Solvers for the large linear systems. In this report, the emphasis is laid upon systematic investigations and comparisons involving the use of typical Fast Solvers and well-known classical methods. As the solvers are applied at each time and each linearization step the total computing time considerably depends on their efficiency. As a result, we show that the use of a special Multigrid Solver in connection with the time step size control yields a very efficient composite algorithm.
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Solchenbach, K., Stüben, K., Trottenberg, U., Witsch, K. (1982). Efficient solution of a nonlinear heat conduction problem by use of fast elliptic reduction and multigrid methods. In: Hinze, J. (eds) Numerical Integration of Differential Equations and Large Linear Systems. Lecture Notes in Mathematics, vol 968. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0064885
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DOI: https://doi.org/10.1007/BFb0064885
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