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Hydroelastic Response of VLFS with An Attached Submerged Horizontal Solid/Porous Plate Under Wave Action

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Abstract

The hydroelastic responses of a submerged horizontal solid/porous plate attached at the front of a very large rectangular floating structure (VLFS) under wave action has been investigated in the context of linear water wave theory. Darcy’s law is adopted to represent energy dissipation in pores. It is assumed that the porous plates are made of material with very fine pores so that the normal velocity across the perforated porous is linearly associated with the pressure drop. In the analytic method, the eigenfunction expansion-matching method (EEMM) for multiple domains is applied to solve the hydrodynamic problem and the elastic equation of motion is solved by the modal expansion method. The performance of the proposed submerged horizontal solid/porous plate can be significantly enhanced by selecting optimal design parameters, such as plate length, horizontal position, submerged depth and porosity. It is concluded that good damping effect can be achieved through installation of solid and porous plate. Porous plate has better damping effect at low frequencies, while solid plate has better damping effect at high frequencies. The optimal ratio of plate length to water depth is 0.25–0.375, and the optimal ratio of submerged depth to water depth is 0.09–0.181.

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Authors and Affiliations

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

    Ming-wei Feng, Zhao-chen Sun & Shu-xiu Liang

  2. School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen, 361024, China

    Bi-jin Liu

Authors
  1. Ming-wei Feng
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  2. Zhao-chen Sun
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  3. Shu-xiu Liang
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  4. Bi-jin Liu
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Corresponding author

Correspondence to Zhao-chen Sun.

Additional information

Foundation item: This study was financially supported by the National Key R&D Program of China (Grant No. 2019YFC1407700) and the National Natural Science Foundation of China (Grant No. 51779038).

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Feng, Mw., Sun, Zc., Liang, Sx. et al. Hydroelastic Response of VLFS with An Attached Submerged Horizontal Solid/Porous Plate Under Wave Action. China Ocean Eng 34, 451–462 (2020). https://doi.org/10.1007/s13344-020-0041-5

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  • DOI: https://doi.org/10.1007/s13344-020-0041-5

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