Stephan T. Grilli

Learn More
In this paper, several numerical aspects of an existing model for fully nonlinear waves are improved and validated to study wave breaking due to shoaling over a gentle plane slope and wave breaking induced by a moving lateral boundary. The model is based on fully nonlinear potential flow theory and combines a higher-order Boundary Element Method (BEM) for(More)
Case studies of landslide tsunamis require integration of marine geology data and interpretations into numerical simulations of tsunami attack. Many landslide tsunami generation and propagation models have been proposed in recent time, further motivated by the 1998 Papua New Guinea event. However, few of these models have proven capable of integrating the(More)
The Papua New Guinea (PNG) tsunami of July 1998 was a seminal event because it demonstrated that relatively small and relatively deepwater Submarine Mass Failures (SMFs) can cause devastating local tsunamis that strike without warning. There is a comprehensive data set that proves this event was caused by a submarine slump. Yet, the source of the tsunami(More)
A new method is proposed for the generation of permanent form periodic waves, in a two-dimensional fully nonlinear potential flow model. In this method, a constant volume is maintained in the computational domain (" wave tank ") by simultaneously generating a mean current, equal and opposite to the waves mean mass transport velocity. An absorbing beach is(More)
Three-dimensional experiments and fully nonlinear computations are performed at the University of Rhode Island, to investigate tsunami generation by underwater landslides. Each experiment consists of a solid landslide of idealized smooth shape sliding over a plane slope. Surface elevations are measured using very accurate gages placed at strategic(More)
Numerical simulations are performed with a two-dimensional ͑2D͒ fully nonlinear potential flow ͑FNPF͒ model for tsunami generation by two idealized types of submarine mass failure ͑SMF͒: underwater slides and slumps. These simulations feature rigid or deforming SMFs with a Gaussian cross section, translating down a plane slope. In each case, the SMF center(More)
Large scale, three-dimensional, laboratory experiments are performed to study tsunami generation by rigid underwater landslides. The main purpose of these experiments is to both gain insight into landslide tsunami generation processes and provide data for subsequent validation of a three-dimensional numerical model. In each experiment a smooth and(More)
SUMMARY We give a more general derivation of the particle velocity and acceleration used in the numerical wave model of Grilli et al. by expressing these quantities in a local orthogonal coordinate system. Computations of solitary waves propagating and breaking over a sloping bottom show that the new formulation gives better results than the former one in(More)