Abstract
Wave‐induced forces on a submarine pipeline in regular waves placed near a plane boundary were studied in the inertia‐drag regime. The in‐line root mean square (rms) coefficient was computed using Morison equation and linear wave theory. A Fourier analysis was carried out on transverse forces and nth harmonic transverse rms coefficients were evaluated. Both these rms hydrodynamic coefficients were correlated with Keulegan‐Carpenter number or period parameter, gap ratio, and depth parameter. The rms hydrodynamic coefficients were found to depend not only on period parameter and gap ratio but also on depth parameter. The dependence of the hydrodynamic coefficients on depth parameter is such that they decrease with a decrease in depth parameter. The presentation of the results as a single force coefficient, such as rms coefficients, is found to reduce the scatter in the results considerably and avoids any phase problems. It is found from the Fourier analysis that the transverse force oscillates at twice the oscillation frequency of the wave at large values of period parameter, at least within the range of period parameter encountered in this investigation.
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