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NUMERICAL MODELLING OF EROSION OF A COHESIVE SOIL BY A TURBULENT FLOW

Abstract : Erosion mechanisms are the main cause of hydraulic failure in embankments. Therefore, the resistance of soils to erosion must be quantified. To this hand, several devices are used such as the Jet Erosion Test (JET), whose model of interpretation is strongly empirical. The aim of this study is to determine the relevance of the interpretation model of the JET. For this purpose, a 2D Navier-Stokes numerical model of erosion of cohesive soils by a turbulent flow has been proposed. We first developed and implemented an interface movement model, whose input parameters are the erosion parameters found experimentally by JET test. Then, the scour depth evolutions obtained numerically for three JET test cases are compared to experimental data. Good agreement is obtained. A parametric study has also been conducted to validate the accuracy of the numerical results. These results contribute to the validation of the JET interpretation model. To extend its domain of application, we applied the numerical model to concentrated leak erosion during Hole Erosion Tests (HET). Three HET were modeled and, here again, our numerical results are in satisfactory agreement with the experimental results from the tests. An analysis of the erosion law and erosion parameters obtained with JET and HET was finally initiated. The potential influence of the flow incidence angle on the erosion efficiency was underlined.
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Submitted on : Monday, April 14, 2014 - 1:36:18 PM
Last modification on : Friday, October 23, 2020 - 5:01:33 PM
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  • HAL Id : tel-00978589, version 1

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Florian Mercier. NUMERICAL MODELLING OF EROSION OF A COHESIVE SOIL BY A TURBULENT FLOW. Fluids mechanics [physics.class-ph]. Aix-Marseille Université, 2013. English. ⟨tel-00978589⟩

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