Pile-gravity type complex wharf is a new offshore structure concept in engineering, and the stability of the submerged caisson is the important factor for this structure. In the present paper, the application of a higher-order boundary element method in the numerical simulation of wave diffraction by a submerged caisson is described. In this method, water surface and body surface are divided into many quadratic elements or triangular elements. Numerical results, including wave force and water surface, are obtained for a series of wave diffraction problems in a circular tank and in the time-domain approach. Also, these results are compared with physical model experiment results. Study shows that the numerical results are precision and stability and can be used to analyse the wave load on this complex structure.
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