E3S Web Conf.
Volume 40, 2018River Flow 2018 - Ninth International Conference on Fluvial Hydraulics
|Number of page(s)||8|
|Section||River morphodynamics and restoration|
|Published online||05 September 2018|
Calibration of a numerical model for the transport of floating wooden debris
Department of Civil Engineering and Architecture, University of Pavia
2 Department of Science and Technology of Materials and Fluids, University of Zaragoza
* Corresponding author: email@example.com
The paper describes the calibration of a numerical model to simulate the 2D motion of floating rigid bodies. The proposed model follows a one-way coupling Eulerian-Lagrangian approach, in which the solution of the Shallow Water Equations (SWE) is combined with the Discrete Element Method (DEM) to compute the displacement of rigid bodies. Floating bodies motion is computed by adapting the Maxey-Riley equation to the case of semi-submerged bodies at high Reynolds number. In order to account for the flow velocity distribution along the body axis, the elements are divided into shorter subsections. A specific formulation is proposed to calculate the rotation of wooden cylinders, by computing the angular momentum. The model includes also a term of added inertia, which accounts for the resistance to rotation and requires the calibration of a specific inertia coefficient. A series of flume experiments is performed to calibrate the model. The 2D trajectories of floating spheres and the linear and angular displacement of cylinders are recorded in stationary conditions. The comparison between the experimental data and the simulation shows that the numerical results are in agreement with the experimental ones, although less accuracy is observed in the reproduction of the angular displacement.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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