| Reference : Impact of floating bodies on buildings and structures during flooding |
| Dissertations and theses : Doctoral thesis | |||
| Engineering, computing & technology : Civil engineering | |||
| Computational Sciences | |||
| http://hdl.handle.net/10993/38676 | |||
| Impact of floating bodies on buildings and structures during flooding | |
| English | |
Liao, Yu-Chung  [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > >] | |
| Oct-2018 | |
| University of Luxembourg, Luxembourg | |
| Docteur en Sciences de l'Ingénieur | |
| [en] smoothed particle hydrodynamics ; computational fluid dynamics ; discrete element method ; finite element method ; modelling | |
| [en] Flood is one of the most serious natural disasters that affect human beings,
so how to effectively reduce flood damage to human beings is of vital im- portance. One of the keys to reducing flood damage is to design buildings effectively enough to withstand flooding and the impact of floating debris on the structures. Although, many studies exist to address the impact of floods on structures, the impact of floating debris on the buildings and structures, i.e. wall or bridge during flooding have not been fully addressed yet. Thus, the objec- tive of this dissertation is to predict the trajectory of floating debris of rivers during flooding and analyze its impact on the structures. For achieving this goal, a numerical tool based on the mesh-less method of Smoothed Particle Hydrodynamics (SPH), Discrete Element Method (DEM) and Finite Element Method (FEM) is proposed in this dissertation. Where SPH is employed to describe the fluid flow and DEM is employed to ob- tain the contact force between the floating debris and structures. And a coupling model of SPH and DEM is presented and implemented based on the OpenFPM, a scalable and open C++ framework for particles and mesh simulation in parallel. Buildings and structures are represented by Finite Element Method (FEM) mesh, for which impact with floating debris is de- termined. These contacts of floating debris cause forces at the positions of impact, e.g. mechanical load and are evaluated by using commercial Finite Element Analysis (FEA) software Abaqus. As a result, a numerical tool combing the SPH-DEM and FEA is presented in this dissertation It is worth to notice, that treating the inlet/outlet con- dition in SPH is a challenging issue due to its Lagrangian nature. A suitable boundary treatment for the inlet / outlet condition in SPH for river flooding problem in 3D is unavailable in literatures. Thus, this dissertation extended the open boundary treatment for SPH using semi-analytical conditions and Riemann solver in 2D (Ferrand et al., 2017) to 3D. Which in results, a new open boundary treatment that is suitable for describing the inlet/outlet condition of SPH in 3D is presented and applied to describe the inlet/outlet condition in this dissertation. The numerical tool is applied to study the scenario of floating trees, trans- porting in the Mosel river and hitting the flood control wall at Kesten town in the west Germany during flooding. As the result of simulation shows, the floating trees are driven by the river and heading to the downstream and eventually collide with the flood control wall. This impact causes the flood control wall crack from the position of impact. Which means that the flood control wall is not capable of standing the impact of floating trees that transported in the river. | |
| http://hdl.handle.net/10993/38676 | |
| FnR ; FNR7690847 > Yu-Chung Liao > > Impact of Debris Flow on Buildings and Structures during Flooding > 15/10/2014 > 14/10/2018 > 2014 |
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