Abstract
Smoothed Particle Hydrodynamics (SPH) is known as very useful method for large deformation problems, such as movement of wave absorbing blocks and sliding of caisson breakwater. Also, in the coastal area, boulders launched by tsunami and by high waves with typhoons (named tsunami boulders and storm boulders) are focused on because of risk assessment towards the tsunami or super typhoons. However, the difference of their movement mechanism have been rarely investigated in detail. This study aims to simulate the movement of the tsunami boulders and storm boulders, comparing with the hydraulic experiment, and evaluating the transport characteristics. Wave elevation and boulder displacement were reproduced in the numerical wave flume well compared to physical model. Also, there is difference between solitary and irregular waves when waves act on boulders.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/WOfXbU7m_8E
Highlights
Smoothed Particle Hydrodynamic (SPH) method is a Lagrangian mesh-less method
MAJOR RESULTS Figure 1 shows snapshots of boulder movement. It indicates that the direction of wave action when the boulder moves is different
Solitary wave acts on boulder before wave breaking whereas irregular waves act on boulder after breaking
Summary
Smoothed Particle Hydrodynamic (SPH) method is a Lagrangian mesh-less method. The technique discretizes a continuum using a set of particles or material points, so it is known that SPH is useful to for dealing with large deformation problems that is difficult to handle with Euler method. SET UP This research uses DualSPHysics which is an opensource code. Navier-Stokes equation is discretized by set of particles or material points. The calculation is conducted by GPU or CPU and GPU enables us to simulate millions of particles. The collision between solid particles is calculated by Distinct Element Method.
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