Experimental and Numerical Study on Dam Break Flow Characteristics / 댐 붕괴 흐름의 유동 특성에 관한 실험 및 수치적 연구
- Resource Type
- Dissertation/ Thesis
- Authors
- Kim, Hyung Joon / 김형준
- Source
- Subject
- Language
- English
In this study, flow kinematics and pressure distribution of dam break flow were investigated by a series of experiments and numerical simulations. The experiments were performed with Particle Image Velocimetry (PIV) and shadowgraph image techniques to obtain the velocity fields and free surface image of dam break flow. The pressure distributions were measured with pressure sensors on the vertical wall and bottom. Flow kinematics including velocity field in system was investigated by the PIV technique. The temporal variation of energy was investigated with various initial water depth. Potential energy gradually changed to the kinetic energy after gate opening, and experimental results showed energy dissipation in dam break flow. The pressure measurement results were provided on the vertical wall and bottom and showed two peaks in both of wall impinge phase and touch-down phase where dynamic pressure was dominant. Vorticity in corner flow of dam break was investigated and compared with pressure distribution on wall and bottom. Computational fluid dynamics (CFD) simulations were performed by STAR-CCM+ using the volume-of-fluid (VOF) method and compared with the experimental data including free surface shape, pressure distribution and mechanical energy. The dissipation of mechanical energy observed both experimentally and numerically has been analyzed through CFD, and the influence of enstrophy to the energy dissipation was more dominant than that of friction.