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Inertia forces on conductor arrays in a jacket model in regular waves

Santo, H. and Taylor, P. H. and Day, A. H. (2015) Inertia forces on conductor arrays in a jacket model in regular waves. In: International Workshop on Water Waves and Floating Bodies. IWWWFB, Bristol.

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Abstract

A wave phase-based force decomposition allows inertia and drag forces to be separated, we focus here on the inertia force on conductor arrays (closely spaced vertical cylinders). The measured inertia force coefficient of the 1st harmonic force component is very close to 2 for waves both with and without current. For waves without current, the coefficient of the 2nd harmonic force is within 10% of 5/4, the corresponding term in the FNV model. For waves with current, the coefficient of the 2nd harmonic force increases noticeably as the current increases. The effect of conductor spacing is investigated numerically. For the jacket end-on, even when the closest conductors touch, the change in effective CM ~ –5%. In contrast for broadside where the spacing is effectively closer, the change is ~ +45%.