Numerical investigation of tsunami bore effects on structures, part II: effects of bed condition on loading onto circular structures

Nora Asadollahi (), Ioan Nistor () and Abdolmajid Mohammadian ()
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Nora Asadollahi: University of Ottawa
Ioan Nistor: University of Ottawa
Abdolmajid Mohammadian: University of Ottawa

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2019, vol. 96, issue 1, No 15, 351 pages

Abstract: Abstract In this paper, a multiphase three-dimensional numerical reproduction of a large-scale laboratory experiment of tsunami-like bore interaction with a surface-piercing circular column is presented. The numerical simulation is conducted using OpenFOAM. A dam-break mechanism is implemented in order to generate tsunami-like bores. The numerical model is validated using the results of experiments performed at the Canadian Hydraulics Center of the National Research Council in Ottawa, Canada. Unsteady Reynolds-Averaged Navier–Stokes equations are used in order to treat the turbulence effects. The Shear Stress Transport k–ω turbulence model showed a high level of accuracy in replicating the bore–structure interactions. A scaled-up domain is used to investigate the influence of bed condition in terms of various downstream depths and roughnesses. Finally, a broad investigation on bore propagation characteristics is performed. The stream-wise forces exerted on the structural column as well as the bore velocity are compared and analyzed for smooth, rough, dry and wet beds with varying depths.

Keywords: Hydrodynamic force; Bed condition; Hydraulic bore; OpenFOAM (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1007/s11069-018-3544-0

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