Numerical simulation of impulse wave generation by idealized landslides with OpenFOAM

Landslide tsunamis and impulse waves are hazardous events with severe socioeconomic impacts. A long standing problem simulations of these is the generation stage, where landslides water interact. Depth-averaged models like Saint-Venant or Boussinesq Equations lose their validity for such applications. Therefore, we have to rely on a full treatment hydrodynamics, instance by applying Navier-Stokes Computational Fluid Dynamics (CFD). However, applications fully three-dimensional methods landslide sparse, often been outperformed depth averaged when compared experimental data. In this work, evaluate multiphase as implemented in OpenFOAM® terms wave generation. We focus simplified two-dimensional setup consists water, order circumvent additional complexities due rheologies. conduct thorough grid refinement study compare results experiments investigate model convergence, stability, accuracy. The display good agreement data if Courant-Friedrichs-Lewy (CFL) condition modified account specific properties system. Further, use validated sensitivity studies review various scaling relations generated tsunamis. application numerical allows us perform broad parametric tests dissect underlying physics predictive equations systematically. found that first crest may be well estimated solely mass our setting. Including related momentum can improve skill, while other parameters lead no substantial improvement.