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Exponential Euler and Backward Euler Methods for Nonlinear Heat Conduction Problems

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Abstract

In this paper a variant of nonlinear exponential Euler scheme is proposed for solving nonlinear heat conduction problems. The method is based on nonlinear iterations where at each iteration a linear initial-value problem has to be solved. We compare this method to the backward Euler method combined with nonlinear iterations. For both methods we show monotonicity and boundedness of the solutions and give sufficient conditions for convergence of the nonlinear iterations. Numerical tests are presented to examine performance of the two schemes. The presented exponential Euler scheme is implemented based on restarted Krylov subspace methods and, hence, is essentially explicit (involves only matrix-vector products).

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Funding

The work of the first author is supported by the Russian Science Foundation, grant no. 19-11-00338. The first authors thanks Leonid Knizhherman for a useful suggestion.

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Correspondence to M. A. Botchev or V. T. Zhukov.

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(Submitted by A. B. Muravnik)

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Botchev, M.A., Zhukov, V.T. Exponential Euler and Backward Euler Methods for Nonlinear Heat Conduction Problems. Lobachevskii J Math 44, 10–19 (2023). https://doi.org/10.1134/S1995080223010067

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  • DOI: https://doi.org/10.1134/S1995080223010067

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