Anregungen zur Qualitätssicherung in der 3-D-numerischen Modellierung mit FLOW-3D

Gabl, Roman; Gems, Bernhard; Aufleger, Markus; Cesare, Giovanni De

doi:10.1365/s35147-014-0938-0

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…This contrasts with the requirement of a three-dimensional approach, which is performed when the flow field is intended to be numerically modelled in-and outside of a complex building structure (featuring several floors and openings as doors, light shafts, windows, etc.). Further, from the perspective of computational demand, applications of 3-D numerical codes are basically limited to rather small river sections and small-scaled areas respectively (Gabl et al, 2014;Gems et al, 2014a;Habersack et al, 2007). Against this background, the presented case study analysis is intended to focus on a specific building and its immediate sphere of influence.…”

Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

Gems

Mazzorana

Hofer³

et al. 2016

Nat. Hazards Earth Syst. Sci.

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Abstract. Given the current challenges in flood risk management and vulnerability assessment of buildings exposed to flood hazards, this study presents three-dimensional numerical modelling of torrential floods and its interaction with buildings. By means of a case study application, the FLOW-3D software is applied to the lower reach of the Rio Vallarsa torrent in the village of Laives (Italy). A single-family house on the flood plain is therefore considered in detail. It is exposed to a 300-year flood hydrograph. Different building representation scenarios, including an entire impervious building envelope and the assumption of fully permeable doors, light shafts and windows, are analysed. The modelling results give insight into the flooding process of the building's interior, the impacting hydrodynamic forces on the exterior and interior walls, and further, they quantify the impact of the flooding of a building on the flow field on the surrounding flood plain. The presented study contributes to the development of a comprehensive physics-based vulnerability assessment framework. For pure water floods, this study presents the possibilities and limits of advanced numerical modelling techniques within flood risk management and, thereby, the planning of local structural protection measures.

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Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

Gems

Mazzorana

Hofer³

et al. 2016

Nat. Hazards Earth Syst. Sci.

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“…The use of structured, rectangular cells leads to the numerical advantage that all indices for neighbouring elements are known and no additional neighbour list has to be stored. In contrast to body-fitted coordinate elements, a solid surface can cut through an element as a plane in FLOW-3D (Flow Science, Inc., 2014;Gabl et al, 2014a). The original geometry is modified based on the chosen grid.…”

Section: Softwarementioning

confidence: 99%

“…Various validation experiments showed the capacity of FLOW-3D. As examples, the software was successfully used for the investigation of a combined sewer overflow (Fach et al, 2009) and spillways (Gabl et al, 2014a;Johnson and Savage, 2006) as well as an analysis tool for bedload transport processes and flood protection (Gems et al, 2014). The software was also successfully used for local refinements of bridges (Erduran et al, 2012) or air entrainment caused by a vortex (Lo et al, 2015).…”

Section: Softwarementioning

confidence: 99%

3-D numerical approach to simulate the overtopping volume caused by an impulse wave comparable to avalanche impact in a reservoir

Gabl

Seibl

Gems

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. The impact of an avalanche in a reservoir induces impulse waves, which pose a threat to population and infrastructure. For a good approximation of the generated wave height and length as well as the resulting overtopping volume over structures and dams, formulas, which are based on different simplifying assumptions, can be used. Further projectspecific investigations by means of a scale model test or numerical simulations are advisable for complex reservoirs as well as the inclusion of hydraulic structures such as spillways.This paper presents a new approach for a 3-D numerical simulation of the avalanche impact in a reservoir. In this model concept the energy and mass of the avalanche are represented by accelerated water on the actual hill slope. Instead of snow, only water and air are used to simulate the moving avalanche with the software FLOW-3D. A significant advantage of this assumption is the self-adaptation of the model avalanche onto the terrain. In order to reach good comparability of the results with existing research at ETH Zürich, a simplified reservoir geometry is investigated. Thus, a reference case has been analysed including a variation of three geometry parameters (still water depth in the reservoir, freeboard of the dam and reservoir width). There was a good agreement of the overtopping volume at the dam between the presented 3-D numerical approach and the literature equations. Nevertheless, an extended parameter variation as well as a comparison with natural data should be considered as further research topics.

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“…It is possible to establish a relation, based on theoretical assumptions, between the riprap safety factor with the magnitude and the flow velocity direction. In particular, close to the riprap, both the angle of the side slope and the angle of repose for the riprap play an important role in determining the stability of the bank itself [4].…”

Section: Analysis Of Ballast Transport In the Event Ofmentioning

confidence: 99%

“…This software was successfully applied in the simulation of pressure flow, flow below gates, and free surface flow [4].…”

Section: Goals Of the Numerical Modelmentioning

confidence: 99%

Analysis of Ballast Transport in the Event of Overflowing of the Drainage System on High Speed Lines

Amblard¹,

Capoccioni²,

Nivon³

et al. 2015

Int J Railw Tech

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The transport of ballast caused by the overflowing of longitudinal drains is a prime example of the interactions between the railway track and its environment. In such conditions, water flowing from the platform, along with debris, may drag the ballast off the track foundation. The rate of ballast erosion rises when obstacles are placed along the platform.To better understand the phenomenon of ballast transport, research was undertaken in collaboration with Ecole Polytechnique Fédérale de Lausanne (EPFL). Systematic tests were performed on a physical model, using a 1:3 scale factor, under both normal and severe operational conditions, as well as in the case of a platform obstructed by obstacles. Numerical simulations were also run to evaluate different optimised configurations for the drainage system of the platform.The obtained results have improved the understanding of the phenomenon of ballast transport and have made it possible to identify at risk areas where the overflowing may negatively affect the railway traffic.

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Anregungen zur Qualitätssicherung in der 3-D-numerischen Modellierung mit FLOW-3D

Cited by 15 publications

References 13 publications

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

3-D numerical approach to simulate the overtopping volume caused by an impulse wave comparable to avalanche impact in a reservoir

Analysis of Ballast Transport in the Event of Overflowing of the Drainage System on High Speed Lines

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