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Theses

Development of a high fidelity fluid-structure interaction solver : towards flexible foils simulation

Abstract : Recent experimental studies tend to show that the use of chordwise flexibleblades for vertical axis turbines enhances their efficiencies and increases theirlifetime. Numerical simulation of such experiments would provide a betterunderstanding of the Fluid-Structure Interaction (FSI) phenomenon involved.However, this requires a FSI solver capable of accurately predicting the stalldynamics, while computing the deformation of a solid with complex geometry.Thereby, the goal of the thesis is to develop a solver capable of accuratelyreproducing cases of flexible foils at a high Reynolds number. The manuscriptthus presents the development of a solver using the Large-Eddy Simulations (LES)approach to predict fluid dynamics and 3D solid finite elements for soliddynamics, all on unstructured meshes. The development work has been carriedout within the YALES2 library, which was initially designed for fluid mechanics.Consequently, a Structural Mechanics Solver (SMS) has also been developed.Moreover, an original method based on the pseudo-solid approach has beenproposed for the computation of the fluid mesh movement. Fluid and solidsolvers are strongly coupled with a partitioned scheme, providing the opportunityto study dynamics between some fluid and solid of close densities. The FSI solverresulting from this work is therefore able to reproduce a wide variety of complexcases, and can also use a dynamic mesh adaptation method to take into accountlarge solid displacements. Following the review of the numerical methods, the FSIsolver can then be validated. To begin, a 2D numerical reference case withlaminar flow is successfully reproduced. After that, a 3D validation is performedagainst an experiment where a flexible plate is clamped behind a cylinderimmersed in a high Reynolds number flow. Finally, an experiment of a pitchingflexible blade in a channel is reproduced. Despite possible improvementsregarding computational time reduction, this process confirms the potential of theFSI solver for its intended use.
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https://tel.archives-ouvertes.fr/tel-03623578
Contributor : Abes Star :  Contact
Submitted on : Monday, April 4, 2022 - 12:25:13 PM
Last modification on : Thursday, April 14, 2022 - 2:45:17 PM

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FABBRI_2022_diffusion.pdf
Version validated by the jury (STAR)

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  • HAL Id : tel-03623578, version 1

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STAR | LEGI | CNRS | UGA

Citation

Thomas Fabbri. Development of a high fidelity fluid-structure interaction solver : towards flexible foils simulation. Fluid Dynamics [physics.flu-dyn]. Université Grenoble Alpes [2020-..], 2022. English. ⟨NNT : 2022GRALI002⟩. ⟨tel-03623578⟩

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