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Numerical Simulation Study on Wave Dissipating Performances of Air Bubbles Breakwater with Single & Double Air Discharge Pipes

ZHANG Cheng-xing1,WANG Yong-xue2,MA Jia3(1.College of Urban Planning & Environment Science,Xuchang University,Xuchang,Henan 461000,China;2.The State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024, China;3.College of Marine Environment Engineering,Dalian Ocean University,Dalian,Liaoning 116023,China)  
Assuming the two-phase fluid of water and air as a variable density fluid,a numerical model of air bubble breakwater is developed with the continuity equation,Reynolds average equation and k-ε model taken as the governing equations,the VOF method for tracing the interface of the two-phase flows,and the additional source term of the air bubble model added to the continuity equation by the Macro of UDF.The transmission coefficients obtained at the different air amounts and the wave periods agree well with the experimental data.The effects of single double air discharging pipes on the wave dissipating performance of the air bubble breakwater are analyzed with different incident wave characteristics,different distances between two air discharged pipes,the incident wave height and air amounts,then some conclusions are obtained,which are meaningful to study the wave dissipating performances of air bubble breakwaters.
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