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Hydrodynamic performance of combined cylinders structure with dual arc-shaped porous outer walls

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Abstract

This study examines the hydrodynamic performance of short-crested wave interaction with a new porous cylindrical structure by using the scaled boundary finite element method (SBFEM), which is a semi-analytical technique combining the advantages of the finite element method and the boundary element method and with its own special features as well. The cylindrical structure consists of dual arc-shaped porous outer cylinders circumscribing an impermeable inner cylinder. A central feature of the newly extended method is that two virtual outer cylinders extending the arc-shaped porous outer cylinders with the same centre are introduced and variable porous-effect parameters are also introduced for the two virtual cylinders, so that the final SBFEM equation still can be handled in a closed-form analytical manner in the radial direction and by a finite element approximation in the circumferential direction. The entire computational domain is divided into two bounded and one unbounded domains, and a variational principle formulation is used to derive the SBFEM equation in each sub-domain. The velocity potential in bounded and unbounded domains is formulated using sets of Bessel and Hankel functions respectively, and the unknown coefficients are determined from the matching conditions. The results of numerical verification show that the approach discretises only the outermost virtual cylinder with surface finite-elements and fewer elements are required to obtain very accurate results. Influences of the incident wave parameters and structural configurations on the hydrodynamics are examined.

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China

    Gao Lin & Jun Liu

  2. School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China

    Gao Lin & Jun Liu

Authors
  1. Gao Lin
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  2. Jun Liu
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Correspondence to Jun Liu.

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Contributed by LIN Gao (CAS Academician)

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Lin, G., Liu, J. Hydrodynamic performance of combined cylinders structure with dual arc-shaped porous outer walls. Sci. China Phys. Mech. Astron. 55, 1963–1977 (2012). https://doi.org/10.1007/s11433-012-4898-z

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  • DOI: https://doi.org/10.1007/s11433-012-4898-z

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