VIV Analysis of a Cantilevered Pipe Discharging Fluid with a Nozzle in the Sea

Autor: Hiroyuki Kajiwara, Shuai Meng
Rok vydání: 2013
Předmět:
Zdroj: IFAC Proceedings Volumes. 46:374-379
ISSN: 1474-6670
DOI: 10.3182/20130918-4-jp-3022.00028
Popis: Vortex induced vibration (VIV) should be taken into account for the vibration analysis of a cantilevered marine riser. This paper is dedicated to the VIV for the nonlinear vibration analysis of a cantilevered pipe discharging fluid with a nozzle at sea. In this study, three dimensional (3-D) motion equations are derived based on modified Hamilton Principle in a rigorous way. The Morison formula is used to calculate the external fluid-induced static drag force and viscous damping forces in the in-line (IL) and cross-flow (CF) directions. A double-van der Pol oscillator model is adopted employing a set of calibrated wake coefficients in Facchinetti et al. (2004) for the VIV effect. A new hydrodynamic force model is proposed considering the coupling effect of IL and CF motions. The mathematical model together with proposed solution methods are validated after comparisons with experimental results.
Databáze: OpenAIRE