Accuracy of Heat Load Transfer in a Quasi-Dynamic Fluid-Structure Interaction

Abstract : This paper is devoted to investigate the temporal and spatial accuracy in transient conjugate heat transfer problems where the influence of unsteadi-ness in the fluid is supposed to be negligible. The numerical method is based on an iterative procedure with interpolated boundary conditions on the solid side. Emphasis is put on these interpolation procedures. First it is shown that a temporal interpolation is by no means the most appropriate way of estimating the flow boundary conditions prescribed on the coupled solid surfaces. In contrast, when these conditions are based on the heat flux/temperature linearity, significantly better results are obtained. Indeed, they compare very well against a reference solution provided by a non-iterative and non-interpolated coupled computation. Moreover, important improvements were made by adequately defining the integral contribution of the boundary condition using the Gauss points in the finite element solid code. Finally, it was also revealed that a relevant approximation of the heat transfer requires a sufficiently fine solid mesh at the interface.
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Submitted on : Friday, August 2, 2019 - 1:45:00 PM
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Rocco Moretti, Marc Lazareff, Marc Errera, Frédéric Feyel, Tristan Soubrié, et al.. Accuracy of Heat Load Transfer in a Quasi-Dynamic Fluid-Structure Interaction. 2019. ⟨hal-02262368⟩

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