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1 results

  • 5 - Flow-Induced Instabilities

  • 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 132-157

  • Summary

    This chapter covers several types of flow instabilities of cylindrical bodies in current: vortex- induced vibrations (VIVs) and galloping, flutter, and wake-induced instabilities (WIO). VIVs mostly affect cylinders of circular cross section and they must be accounted for to assess the fatigue life of risers. The concept of reduced velocity is introduced and illustrative experimental values of VIV responses are given. Predictive methods are briefly described. Galloping instabilities appear at higher values of the reduced velocities for prismatic cylinders. Experimental results are given for a square cylinder and the quasi-static predictive method is outlined. Whereas, in galloping, only one degree of freedom is at hand, in the direction perpendicular to the free stream, in flutter an additional rotational motion comes into play. Finally Wake-Induced Instabilities are described, in the particular case of one circular cylinder in the lee of an upstream one.