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Theses

Trainée et portance dans les fluides newtoniens et les fluides à seuil

Abstract : This experimental and numerical thesis deals with the creeping flow of a Newtonian fluid and a yield stress fluid around a plate or a cylinder in the presence of a wall. The generated forces and the flow structures have been particularly studied. The study focuses for the yield stress fluid on large yield stress effects compared to the viscous effects. For the experimental approach, a device has been designed to measure simultaneously the drag and lift forces as a function of velocity and obstacle / wall distance. The fluids studied are a Newtonian glucose syrup and a Carbopol gel considered as a yield stress fluid model. These materials have been finely characterized from the rheological point of view. Numerical simulations using the Herschel-Bulkley anelastic viscoplastic model regularized by the Papanastasiou model were carried out. The results obtained with the Newtonian fluid allowed to validate the experimental set-up and the numerical approach. The effects of the yield stress, the wall / obstacle distance, the power law index and the inclined plate on the drag and lift coefficients were carefully examined. The lubrication regime has been studied for the cylinder both experimentally and theoretically. The morphology of the flow (rigid zones) and the local field quantities have been shown. Analytical solutions of drag and lift have been proposed. Comparisons between the experimental and numerical results as well as the solutions resulting from the plasticity of soil mechanics are analyzed. Deviations are discussed in terms of the elasticity and plasticity influence of the yield stress fluid.
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  • HAL Id : tel-02119665, version 1

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STAR | CNRS | UGA

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Ziemihori Ouattara. Trainée et portance dans les fluides newtoniens et les fluides à seuil. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAI032⟩. ⟨tel-02119665⟩

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