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

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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.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada

    Nora Asadollahi, Ioan Nistor & Abdolmajid Mohammadian

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  1. Nora Asadollahi
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  2. Ioan Nistor
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  3. Abdolmajid Mohammadian
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Correspondence to Nora Asadollahi.

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Asadollahi, N., Nistor, I. & Mohammadian, A. Numerical investigation of tsunami bore effects on structures, part II: effects of bed condition on loading onto circular structures. Nat Hazards 96, 331–351 (2019). https://doi.org/10.1007/s11069-018-3544-0

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  • DOI: https://doi.org/10.1007/s11069-018-3544-0

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