Numerical simulation of wave generation by a bottom-tilting flume wavemaker

• Main Authors: Hsin-Erh Wang, 王昕兒
• Other Authors: I-Chi Chan
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/bb4578

碩士 === 國立臺灣大學 === 土木工程學研究所 === 107 === In this thesis, the OpenFOAM software and the solver olaFlow, which specialize in boundary conditions and porous media flow, are used to calculate the volume-averaged Reynolds average equation VARANS by the volume of fluid method and the finite volume method, and simulate the bottom-tilting wave maker. The boundary conditions of this model are impermeable, so the porosity is not considered. The validation is divided into two parts. The first part is the analysis of the change of the free surface elevation of rectangular-shape wave by Madsen et al. (2008). The first part is the comparison between the analysis of the free surface elevation of the rectangular-shaped wave by Madsen et al. (2008) and the model in this paper only to find out the result is well fitted. The second part is to design the same wave maker as Lu’s (2017).Then the numerical results are carried out to compare with the experiments data of Lu (2017) and show high degree of accuracy to prove that the numerical wave maker of this study is correct. At the end of the paper, we simulated the bottom-tilting wave maker and changed the four wave maker parameters : moving bottom length, bottom motion displacement, bottom motion duration and initial water depth, to observe the free surface elevation, wave length, amplitude and phase velocity. The results of the study are also compared with the effective wavelengths of solitary waves of the same amplitude, which proves that the bottom-tilting wave wave can generate long waves more effectively.