Drag and Inertia Forces on Circular Cylinders in Harmonic Flow

Abstract

A review of the Morison‐equation approach to the evaluation of wave loads on cylindrical members in harmonic flow is presented. The results presented show the most comprehensive picture to date of the Reynolds number‐displacement ratio dependence of the drag and inertia coefficient in the small‐displacement‐ratio range and demonstrate the important effect of the Reynolds number in the case of both smooth and rough cylinders. Results from oscillating‐cylinder tests are compared with wave‐tank results for both regular and random waves. Finally, a wake model applied to the high Reynolds number case is shown to correlate the drag coefficient for both rough and smooth cylinders quite well.