Numerical Simulations on the Effect of Moving Vegetation to Tsunami Damping
碩士 === 國立中興大學 === 土木工程學系所 === 104 === A coupled wave-vegetation model is presented in this paper for simulating the interaction of solitary waves with the emergent moving vegetation. A CFD based on the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with renormalization group (RN...
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| Format: | Others |
| Language: | en_US |
| Published: |
2016
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| Online Access: | http://ndltd.ncl.edu.tw/handle/26372953525464380984 |
| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 104 === A coupled wave-vegetation model is presented in this paper for simulating the interaction of solitary waves with the emergent moving vegetation. A CFD based on the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with renormalization group (RNG) turbulent model associated with volume of fluid (VOF) method was applied for the numerical simulations. This study attempts to provide a better physical model by considering moving cylinders as the vegetation to simulate the damping performance of the vegetation. The wave transformations and the flow field variations of solitary waves propagating over both stationary cylinders and moving cylinders are investigated. The numerical simulation results showed that the turbulent kinetic energy and its dissipation rate are generated as the solitary wave propagating over the both stationary and moving vegetation. Furthermore, the results indicate that the stationary vegetation obtains a greater wave height deduction than the moving vegetation. Stationary vegetation also experienced more turbulent kinetic energy than the moving one, which means it reduces more energy as waves pass through the stationary vegetation. This becomes an important note that the wave decay might be overestimated by considering a group of stationary cylinders as coastal vegetation for the simulation on the effect of vegetation to tsunami damping.
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