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Numerical prediction of sediment deposition at a river confluence using an euler-lagrange method

Abstract : Sediment deposition near to a river confluence is a crucial challenge for navigation since it can strongly affect the bed morphology and thus the barges traffic. The prediction of particle deposition is thus important in order to optimize the dredging operations which are necessary to maintain a sufficient draft. In the present study, we numerically examine the transport and deposition process of sediments at Scarpe and Escaut confluence (north of France) using an Euler-Lagrange approach. This method is known to be able to accurately predict the behaviour and spatial distribution of inertial particles in turbulent fluid flow. Nonetheless, contrary to the standard method (based on convection-diffusion equation for sediment concentration) usually used to predict the behaviour of sediments in such a complex configuration, it has an higher computational cost. In our study, the mean fluid flow is predicted by solving the 3D Reynolds-Averaged Navier-Stokes (RANS) equations. The trajectory of each sediment is then computed from the particle equation of motion with a stochastic dispersion model which predicts the sediment/turbulence interaction.
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https://hal.univ-lorraine.fr/hal-03154039
Contributor : Souria Hamidouche Connect in order to contact the contributor
Submitted on : Friday, February 26, 2021 - 10:58:15 PM
Last modification on : Thursday, April 1, 2021 - 7:36:01 AM
Long-term archiving on: : Thursday, May 27, 2021 - 7:11:14 PM

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Souria Hamidouche, Boris Arcen, Anne Tanière. Numerical prediction of sediment deposition at a river confluence using an euler-lagrange method. 9th International Conference on Multiphase Flow, May 2016, Firenze, Italy. ⟨hal-03154039⟩

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