Numerical simulation of the impact of a plunging breaker on a vertical structure and subsequent overtopping event using a Navier-Stokes VOF model
Date of Original Version
We study processes that occur during impact of a breaking wave on a vertical wall, and the resulting overtopping event, based on numerical simulations using a multiple-fluid Navier-Stokes VOF model (air-water). The latter allows to track high interface deformations during the breaking and impact. Both impact process and overtopping event are studied as a function of the relative distance of the vertical wall from the breaking point (defined as the location where a vertical tangent appears on the free surface). We study hydrodynamic forces and pressure peaks on the vertical wall, with the temporal and spatial discretizations. Expectedly, a finer discretization leads to a better description of the pressure peak on the wall, which can increase the total force applied to the wall by up to a factor 6. Similarly, we study, overtopping rates as a function of the distance of the breaking point in front of the wall. Some studies indicated that the critical case, yielding maximum volumetric rate, is for a wall placed at the breaking point. In the application studied here, the maximum overtopped volume of water occurs for a distance to breaking equal to 1.69 times the breaking wave height. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).
Proceedings of the International Offshore and Polar Engineering Conference
Mokrani, Cyril, Stéphane Abadie, Stéphan Grilli, and Kamel Zibouche. "Numerical simulation of the impact of a plunging breaker on a vertical structure and subsequent overtopping event using a Navier-Stokes VOF model." Proceedings of the International Offshore and Polar Engineering Conference 3, (2010): 729-736. https://digitalcommons.uri.edu/oce_facpubs/152