抄録
Long towed pipe is used for dilution of CO2 in the moving ship concept of ocean sequestration of CO2. Vortex Induced Vibration (VIV) is expected for the towed inclined pipe. Time marching VIV simulation method was developed and validity of the method was verified. The method is a combination of a data base of VIV hydrodynamic force on the cylinder subjected to harmonic oscillation and a time marching FEM (Finite Element Method) of underwater line structure. VIV force is calculated by CFD (Computational Fluid Dynamics) . A filter which estimates amplitude, frequency and phase of a local response of pipe from the time history of pipe vibration was developed. Using this filter, parameters of local vibration and instantaneous VIV force is evaluated by consulting the data base. The estimated VIV force is applied to the pipe and response of towed pipe is calculated by the FEM. The method was verified by comparison with experimental results carried out in the towing tank. The accuracy of the method is discussed.
