Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows

Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows

Duz, B.

Huijsmans, R.H.M. (promotor)
Veldman, A.E.P. (promotor)

Mechanical, Maritime and Materials Engineering

Maritime and Transport Technology

2015-09-21

The PhD study focused on two topics. The first topic was energy dissipation in wave propagation. The wave dissipation can be caused by physical and/or numerical phenomena, such as the free surface treatment, physical viscosity and artificial viscosity due to discretization of the momentum equations. Among these the free surface treatment is an important factor, and its effect on wave dissipation was studied extensively. The Volume-of-Fluid (VOF) method, which is responsible for displacement of the free surface, was improved to a great extent, and a significant reduction in wave dissipation is obtained. The second topic of this work was to design a generating and absorbing boundary condition (GABC) which can account for dispersive and directional effects of free surface water waves. This is achieved through the implementation of a second-order Higdon boundary condition. This boundary condition was modified in such a way that generating and absorbing short-crested waves in an efficient and accurate manner are possible. Numerical and experimental results are provided to demonstrate the capabilities of both the VOF method and the GABC.

generating and absorbing boundary condition
volume of fluid method
wave damping
free surface modeling
free surface water waves
wave propagation
wave impact on structures

https://doi.org/10.4233/uuid:e204277d-c334-49a2-8b2a-8a05cf603086

978-94-6169-748-6

Institutional Repository

doctoral thesis

(c) 2014 Duz, B.