ETI法を用いた流体剛体連成シミュレーションによる地滑り型津波の再現解析

<p>There are several numerical simulation tools to reproduce the behavior of rigid bodies that are involved with waterrigid or rigid-rigid contacts. Although the penalty method is one of the most commonly used methods for that purpose, there are some disadvantages when it comes to the computational performance especially for large scale problems, since it requires a relatively small time increment to provide a reasonable numerical accuracy. To deal with this problem, we propose an alternative rigid body dynamics simulator called energy-tracking impulse (ETI) method that is capable of using the same time increment for rigid body and fluid simulations. For the fluid simulation, we applied the stabilized ISPH method(1), which is already well recognized in many engineering problems. We conducted a numerical simulation of a rigid body slide induced tsunami problem to study the wave generation and propagation processes. As a result, the computed and experimental water surface elevation results are in a good agreement at different times. Finally, we carried two rock slide induced tsunami simulations using a single rigid body and multi rigid bodies to test the robustness of the method.</p>