Hydrodynamic coefficients of a harmonically oscillated tower |
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| Authors: | Subrata K Chakrabarti Dennis C Cotter Alan R Libby |
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| Institution: | Marine Research Division, Chicago Bridge & Iron Co., Plainfield, Illinois 60544-8929, USA |
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| Abstract: | A tower hinged at the bottom was oscillated mechanically in a sinusoidal fashion in a plane in still water. An instrumented section in the tower measured the inline and transverse forces locally on the tower due to the hydrodynamic effects. These forces are analyzed for the added mass, drag and lift coefficients which are presented as functions of Keulegan-Carpenter and Reynolds number. The lift force frequencies are also investigated. The measured overall reactions on the tower are used to verify the values of the local coefficients. The results presented here are not only applicable to articulated towers but to other moving elements of an offshore structure, e.g. risers, tension-legs, etc. |
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| Keywords: | Added mass coefficient drag coefficient lift coefficient articulated tower oscillation hydrodynamic coefficient |
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