The nonlinear wave and current effects on fixed and floating bodies by a three-dimensional fully-nonlinear numerical wave tank

2022 ◽  
Vol 245 ◽  
pp. 110458
Author(s):  
Sung-Jae Kim ◽  
MooHyun Kim
Keyword(s):  
Nonlinear Wave ◽  
Three Dimensional ◽  
Numerical Wave Tank ◽  
Floating Bodies ◽  
Wave Tank ◽  
Fully Nonlinear ◽  
Numerical Wave

scholarly journals Development of a Three-Dimensional Fully Nonlinear Potential Numerical Wave Tank for a Heaving Buoy Wave Energy Converter

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Sung-Jae Kim ◽  
Weoncheol Koo
Keyword(s):  
Wave Energy ◽  
Large Amplitude ◽  
Three Dimensional ◽  
Wave Energy Converter ◽  
Numerical Wave Tank ◽  
Energy Converter ◽  
Wave Tank ◽  
Fully Nonlinear ◽  
Nonlinear Potential ◽  
Numerical Wave

The hydrodynamic performance of a vertical cylindrical heaving buoy-type floating wave energy converter under large-amplitude wave conditions was calculated. For this study, a three-dimensional fully nonlinear potential-flow numerical wave tank (3D-FN-PNWT) was developed. The 3D-FN-PNWT was based on the boundary element method with Rankine panels. Using the mixed Eulerian–Lagrangian (MEL) method for water particle movement, nonlinear waves were produced in the PNWT. The PNWT can calculate the wave forces acting on the buoy accurately using an acceleration potential approach. The constant panels and least-square gradient reconstruction method were applied to regridding of computational boundaries. An artificial damping zone was employed to satisfy the open-sea conditions at the end free surface boundaries. The diffraction and radiation problems were solved, and their solutions were confirmed by a comparison with previous studies. The interaction of the incident wave, floating body, and power take-off (PTO) behavior was examined in the time domain using the developed 3D-FN-PNWT. From comparison, the difference between the conventional linear analysis and the nonlinear analysis in large-amplitude waves was examined.

Simulation of Outgoing Waves at the Boundaries of a Three Dimensional Fully Nonlinear Numerical Wave Tank

2003 ◽  
Author(s):  
Alaa M. Mansour ◽  
A. Neil Williams
Keyword(s):  
Boundary Condition ◽  
Boundary Conditions ◽  
Nonlinear Wave ◽  
Three Dimensional ◽  
Damping Factor ◽  
Numerical Wave Tank ◽  
Frequency Range ◽  
Wave Tank ◽  
Numerical Wave ◽  
Numerical Beach

This paper presents an efficient boundary condition to simulate outgoing waves at the boundaries of the truncated domain in a three-dimensional numerical wave tank. The present study is based on coupling of two prescribed boundary conditions, namely, numerical beach and Orlanski boundary conditions. The use of a numerical beach is known to be efficient in the high frequency range, however, Orlanski boundary condition has been successfully applied in the low frequency range. The proposed study is based on coupling of these two prescribed boundary conditions to make use of their complementary bandwidths. The model has been calibrated to determine the optimal length and the most efficient damping factor within the numerical beach region. The semi-infinite tank has then been used to simulate nonlinear wave propagation in shallow water. The results of this simulation have been verified through a comparison with previous published experimental measurements. The model is then further applied to simulate the nonlinear wave diffraction by and the associated hydrodynamic forces on a bottom mounted surface piercing circular uniform cylinder. Further investigation of the efficiency of the coupled boundary condition when using a spatially-varying damping factor in the presence of scattered wave field is presented.

Sign in / Sign up

Export Citation Format

Share Document