Modelling of tsunami-induced bore and structure interaction

Abstract

2 3A series of three-dimensional smoothed particle hydrodynamics (SPH) and finite-element (FE) models, with a domain in the form of a water tank, were undertaken to simulate tsunami-induced bore impact on a discrete onshore structure on a dry bed. The fluid motion was simulated using the SPH-based software DualSPHysics. The tsunami-like waves were represented by solitary waves with different characteristics generated by the numerical paddle wavemaker. Numerical probes were uniformly distributed on the structure's vertical surface providing detailed measures of the pressure distribution across the structure. The peak impact locations on the structure's surface were specifically determined and the associated peak pressures then compared with the prediction of existing commonly used design equations. Using the pressure-time histories from the SPH model, FE analysis was conducted with Abaqus to model the dynamic response of a representative timber structure. The results show that the equations used to estimate the associated pressure for design purposes can be highly non-conservative. By gaining a detailed insight into the impact pressures and structure response, engineers have the potential means to optimise the design of structures under tsunami impact loads and improve survivability. Notation

Numerical modelling of tsunami bore impact on low-rise residential buildings using SPH

“…The tsunami wave height is moderate in the deep ocean (e.g., 0.5-1 m), but slowly increases as it is approaching the shorelines until it breaks. Broken tsunami waves often inundate the shorelines in the form of a hydraulic bore which is defined as a fast-moving body of water with an onshore mass flux which can be devastating for building structures [4]. The abrupt front of the hydraulic bore has a velocity that its estimation is somewhat difficult to determine because it depends on several factors, including the impoundment depth and the surface frictions.…”

“…The abrupt front of the hydraulic bore has a velocity that its estimation is somewhat difficult to determine because it depends on several factors, including the impoundment depth and the surface frictions. The advancing body of water in the form of the bore that impacting the structure and the resulting bore impact pressures on the structure being located inland, have been explored in several studies [1,3,4]. Experimental modeling of tsunami wave run-up in shallow waters and over a dry bed was conducted by utilizing large wave flumes, showing the similarity of the dam break wave analogy with the tsunami run-up on coastlines [5,6].…”

“…In relation to this, an SPH-based software called DualSPHysics has been developed to enable the use of both central processing units (CPUs) and graphics processing units (GPUs) for performing SPH numerical analysis. The performance of SPH modeling can be improved by taking advantage the hardware acceleration given by the utilization of graphics processing units (GPUs) that enable the speed up of numerical analysis up to 100 times as compared to that of central processing units (CPUs) time [4].…”

Validasi Gerakan Benda Terapung Menggunakan Metode Smoothed Particle Hydrodynamics

“…Karena tidak adanya grid pada pemodelan numerik cukup mendefinisikan jarak partikel pada kondisi awal membuat metode ini membutuhkan waktu yang lebih cepat dibanding metode mesh. Pemodelan menggunakan SPH untuk masalah gelombang telah banyak dilakukan oleh peneliti di dunia untuk bidang teknik pantai [3][4][5][6][7] menunjukkan hasil yang bagus dan telah memiliki akurasi yang baik serta telah tervalidasi dengan hasil eksperimen.…”

The Hydrodynamic Coefficients for Oscillating 2d Rectangular Box Using Weakly Compressible Smoothed Particle Hydrodynamics (Wcsph) Method

“…However, according to dynamic boundary conditions (DBC) [20], a boundary particle is bound to repel approaching fluid particles using repulsive force to prevent any penetration from the fluid particle. Within the same kernel, the force on each boundary particle is computed by adding up the contribution from all the surrounding fluid particles [21][22]. Hence, boundary particles experience a force per unit mass given by:…”