4.6 Article

Large wood transport modelling by a coupled Eulerian-Lagrangian approach

Journal

NATURAL HAZARDS
Volume 91, Issue -, Pages S59-S74

Publisher

SPRINGER
DOI: 10.1007/s11069-017-2891-6

Keywords

Wood transport; Discrete Element Modelling; Drag force; Side force; Hydrodynamic coefficients; Floating cylinders; Flood risk

Funding

  1. ISCRA-C project at CINECA, Italy
  2. CINECA award under the ISCRA initiative

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The paper discusses a model which predicts the trajectory of floating rigid bodies and may be applied to compute the motion of woody debris mobilized during floods. The model couples a Discrete Element (DE) Lagrangian approach for the calculation of motion of rigid bodies with the Eulerian solution of the shallow water equations (SWE), in order to simulate the transport of a cylinder in a two-dimensional stream. It differs from existing models since it is based on a dynamic approach, adapting the Basset-Boussinesq-Oseen equation. In a first step, forces are computed from flow and log velocities; then, the equations of dynamics are solved to model the planar roto-translation of the body. Model results and physical reliability are clearly affected by the values of the drag and side coefficients, especially since logs, modelled as cylinders, are able to change their orientation towards the flow. Experimental studies to evaluate drag and side coefficients can be found in the literature for a submerged cylinder, with various orientations. To extend such results to the case of a floating log, the authors performed a series of laboratory tests on partially submerged cylinders, implementing the outcomes in the proposed DE-SWE model. The coupled model is validated against existing laboratory data concerning spheres and wooden cylinder transport.

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