On the convergence rate of the Dirichlet-Neumann iteration for unsteady thermal fluid structure interaction

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We consider the Dirichlet-Neumann iteration for partitioned simulation of thermal fluid-structure interaction, also called conjugate heat transfer. We analyze its convergence rate for two coupled fully discretized 1D linear heat equations with jumps in the material coefficients across these. These are discretized using implicit Euler in time, a finite element method on one domain, a finite volume method on the other one and variable aspect ratio. We provide an exact formula for the spectral radius of the iteration matrix. This shows that for large time steps, the convergence rate is the aspect ratio times the quotient of heat conductivities and that decreasing the time step will improve the convergence rate. Numerical results confirm
the analysis and show that the 1D formula is a good estimator in 2D and even for nonlinear thermal FSI applications.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering
Original languageEnglish
Pages (from-to)525-541
JournalComputational Mechanics
Issue number3
Early online date2017 Nov 23
Publication statusPublished - 2018
Publication categoryResearch

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