Abstract
A numerical method for the Dirichlet initial boundary value problem for the heat equation in the exterior and unbounded region of a smooth closed simply connected 3-dimensional domain is proposed and investigated. This method is based on a combination of a Laguerre transformation with respect to the time variable and an integral equation approach in the spatial variables. Using the Laguerre transformation in time reduces the parabolic problem to a sequence of stationary elliptic problems which are solved by a boundary layer approach giving a sequence of boundary integral equations of the first kind to solve. Under the assumption that the boundary surface of the solution domain has a one-to-one mapping onto the unit sphere, these integral equations are transformed and rewritten over this sphere. The numerical discretisation and solution are obtained by a discrete projection method involving spherical harmonic functions. Numerical results are included.
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Acknowledgments
This research was carried out while the first author was visiting the University of Linz (Austria) on a Stipendium Lemberg OeAD-GmbH. The hospitality and the support are gratefully acknowledged.
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Chapko, R., Johansson, B.T. Numerical solution of the Dirichlet initial boundary value problem for the heat equation in exterior 3-dimensional domains using integral equations. J Eng Math 103, 23–37 (2017). https://doi.org/10.1007/s10665-016-9858-6
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DOI: https://doi.org/10.1007/s10665-016-9858-6
Keywords
- Boundary integral equations of the first kind
- Discrete projection method
- Exterior 3-dimensional domain
- Heat equation
- Laguerre transformation