Tests and Applications of An Approach to
Absorbing Reflected Waves Towards Incident Boundary |
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| Authors: | ZHANG Hong-sheng WANG Yan XU Chun-Hui SHANG Hui and YU Xiao-wei |
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| Institution: | College of Ocean Environment
and Engineering, Shanghai Maritime
University;College of Ocean Environment
and Engineering, Shanghai Maritime
University;College of Ocean Environment
and Engineering, Shanghai Maritime
University;State Key Laboratory of Ocean
Engineering, Shanghai JiaoTong
University;State Key Laboratory of Ocean
Engineering, Shanghai JiaoTong
University |
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| Abstract: | If the upstream boundary conditions are prescribed based on the incident wave only, the time-dependent numerical models cannot effectively simulate the wave field when the physical or spurious reflected waves become significant. This paper describes carefully an approach to specifying the incident wave boundary conditions combined with a set sponge layer to absorb the reflected waves towards the incident boundary. Incorporated into a time-dependent numerical model, whose governing equations are the Boussinesq-type ones, the effectiveness of the approach is studied in detail. The general boundary conditions, describing the down-wave boundary conditions are also generalized to the case of random waves. The numerical model is in detail examined. The test cases include both the normal one-dimensional incident regular or random waves and the two-dimensional oblique incident regular waves. The calculated results show that the present approach is effective on damping the reflected waves towards the incident wave boundary. |
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| Keywords: | incident boundary sponge layer reflected waves Boussinesq-type model general boundary conditions |
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