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Numerical Simulation Of Wave Propagation Over A Series Of Submerged Rectangular Dikes

Posted on:2013-02-27Degree:MasterType:Thesis
Country:ChinaCandidate:M JiangFull Text:PDF
GTID:2212330362461862Subject:Hydraulic engineering
Abstract/Summary:PDF Full Text Request
Coastal erosion damage is one of the most important content in subject of coastal dynamics. For a long time, waves have caused great damage to coastlines, having a bad effect on beach dynamic equilibrium and structures'security. So it is very important to do some researches on how to protect coastlines from scour. Submerged dikes are main constructions in beach protecting and deposition acceleration. It is also significant for shoreline protection to study how submerged dikes eliminate wave energy.Based on the k-εmodel and the VOF free surface tracking in commercial software Flow3D, vertical two-dimension numerical wave flume model is built and applied to study wave propagation over a series of submerged rectangular dikes. Firstly, a structure of gradually changing horizontal porosity along the flume direction is proposed creatively and adopted at the end of the numerical flume to absorb wave reflection and its wave-absorbing performance is analyzed under the influence of all main parameters, which successfully solves the problem of reflection disturbance at the end of the computational domain. Then the numerical results are compared with experimental data in order to confirm the validity of the numerical model. The results show that the model is completely competent to simulate wave transformation and reflection. Finally, the Bragg reflection parameters, wave height variation along the flume, transmission, and vortex evolution are investigated to understand the effect laws of wave propagation over a series of submerged rectangular dikes, which are influenced by dimensionless variables comprising the number of dikes, relative distance between dikes, relative dike height, relative dike width, and relative wave length. The study results can provide useful references for practical project design.
Keywords/Search Tags:Flow3D, a series of submerged rectangular dikes, Bragg reflection parameters, wave height variation along the flume, vortex evolution
PDF Full Text Request
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