Accelerating waveform relaxation methods with application to parallel semiconductor device simulation

In this paper we apply a Galerkin method to solving the system of second-kmd Volterra integral equations that characterize waveform relaxation, or dynamic iteration, methods for solving linear time-varying initial-value problems. It is shown that the Galerkin approximations can be computed iteratively using Krylovsubspace algorithms. The resulticg iterative methods are combined with an operator Newton method and applied to solving the nonhear differential-algebraic system generated by spatial discretization of the timedependent semiconductor device equations. Experimental results are included to demonstrate that waveform Krylov-subspace methods converge significantly faster than classical waveform relaxation, and are better able to exploit the parallelism available in loosely coupled parallel machines than parallel versions of standard point-wise iterative schemes.

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