Tso Ren Wu

TL;DR: In this paper, a moving boundary technique was developed to investigate wave runup and rundown with depth-integrated equations using a high-order finite difference scheme, which is used to solve highly nonlinear and weakly dispersive equations.

Abstract: To study the waves and runup/rundown generated by a sliding mass, a numerical simulation model, based on the large-eddy-simulation (LES) approach, was developed. The Smagorinsky subgrid scale model was employed to provide turbulence dissipation and the volume of fluid (VOF) method was used to track the free surface and shoreline movements. A numerical algorithm for describing the motion of the sliding mass was also implemented. To validate the numerical model, we conducted a set of large-scale experiments in a wave tank of 104m long, 3.7m wide and 4.6m deep with a plane slope (1:2) located at one end of the tank. A freely sliding wedge with two orientations and a hemisphere were used to represent landslides. Their initial positions ranged from totally aerial to fully submerged, and the slide mass was also varied over a wide range. The slides were instrumented to provide position and velocity time histories. The time-histories of water surface and the runup at a number of locations were measured. Comparisons between the numerical results and experimental data are presented only for wedge shape slides. Very good agreement is shown for the time histories of runup and generated waves. The detailed three-dimensional complex flow patterns, free surface and shoreline deformations are further illustrated by the numerical results. The maximum runup heights are presented as a function of the initial elevation and the specific weight of the slide. The effects of the wave tank width on the maximum runup are also discussed.

TL;DR: In this paper, a three-dimensional, compressible, turbulence model is used to investigate the pressure waves generated by two trains passing each other in a tunnel, where the turbulent flow around the train bodies is computed by the RNG k-ε turbulence model; a sliding mesh method is utilized to treat the moving boundary problem.

TL;DR: In this paper, the authors presented a plausible earthquake rupture model constructed from seismic and geodetic data, together with hydrodynamic simulations of the potential tsunami with COMCOT (COrnell Multi-grid COupled Tsunami model).

TL;DR: Based on the faults parameters issued by USGS and the seismic record from Global CMT, a study created a hypothetical earthquake tsunami scenario caused by seismic motion at Manila trench as discussed by the authors, which is only about 100 km away from Taiwan, therefore one shall punctuate the importance of thorough study on all possible tsunami scenarios for hazard mitigation.