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2 results

  • 4 - Wave and Current Loads on Slender Bodies

  • Bernard Molin, École Centrale de Marseille and NTNU: Norwegian University of Science and Technology
  • Book:
    Offshore Structure Hydrodynamics
    Published online:
    31 January 2023
    Print publication:
    05 January 2023, pp 93-131

  • Summary

    This chapter applies to bodies that are small compared to the wave lengths, of dimensions similar or smaller than the wave amplitude. As a result separation cannot be neglected and semi-empirical methods are usually applied to formulate the wave and current loading. The Reynolds number is introduced and the different flow regimes, for a circular cylinder in current, are illustrated. The Morison equation is introduced and applied to the wave loading upon cylinders. Experimental values of the inertia and drag coefficients, vs the Reynolds and Keulegan-Carpenter numbers, are presented. The deficiencies of the Morison equations, in complex flows, are emphasized. Alternatives such as the independent flow-field formulation, or wake models, are introduced. The oscillatory lift force, in steady current, is introduced and the Strouhal number and reduced velocity are defined.