Abstract
The complex hydrodynamics during a tsunami event can significantly affect the structural integrity of buildings. The resulting hydrodynamic forces are influenced by various fluid parameters such as the fluid density, flow velocity and depth, as well as by the structure’s geometry. Hydrodynamic forces induced by tsunami pressures and velocities are particularly important, as they occur usually around a coastal defence structure or a building and as a result, they affect the structural integrity of the structure (Chinnarasri et al, 2013). The 2011 Japan post-tsunami field survey of Chock et al. (2013) indicated that lateral pressures, uplift pressures and surge flow from the tsunami produced hydrodynamic forces responsible for the destruction of many structures along the Tohoku coastline. The associated hydrodynamic parameters of a tsunami such as pressures and velocities also influence the tsunami-induced scour around buildings. Nicholas et al. (2016) stated that the tsunami-induced hydrodynamic velocity was a crucial factor in producing soil-scour around building structures.
Highlights
The complex hydrodynamics during a tsunami event can significantly affect the structural integrity of buildings
The representative scour depth comparisons were performed at 1:150 scale between the laboratorymeasured (UEL), field, predictive model of Nicholas et al (2016) with experimental conditions and the same predictive model using the numerical hydrodynamic conditions of OpenFoam model
Numerical, experimental, theoretical modelling and post-tsunami field data were used to investigate the hydrodynamic conditions and representative scour depths at the seaward of building structures subjected to tsunami waves
Summary
The complex hydrodynamics during a tsunami event can significantly affect the structural integrity of buildings. (OpenFOAM, 2014) in order to obtain tsunami-induced hydrodynamics parameters for simulated model buildings. VERIFICATION OF NUMERICAL MODEL WITH EXPERIMENTAL RESULTS (AL-FAESLY ET AL., 2012) Figure 2 shows the comparison between the experimental (Al-Faesly et al, 2012) and OpenFOAM numerical results for the time history of the pressure at the front face of the structure and at 0.05m height from the base of the square-section structural model, for an impounding upstream water depth of 0.85m. It was observed that the velocity decreased sharply after 1.4s and remained relatively constant thereafter This indicated that the initial wave interaction on the building was at its peak hydrodynamic conditions; i.e. both high pressures and flow velocities.
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