Session: 08-07-01 Internal Flows & Fluid–Structure Interaction in Riser and Pipeline Systems

Submission Number: 180356

Modelling Vortex-Induced Vibration of a Lazy Wave Dynamic Power Cable for Floating Offshore Wind Turbine with the WOM-VFIFE Approach 

Dynamic power cable transmits electricity from floating offshore wind turbine (FOWT) to the offshore substation, and it plays a pivotal role in the development of marine renewable energy. To reduce the loads on FOWT, the lazy wave dynamic power cable (LWDPC) has been introduced, which employs buoyancy modules to form a wave-like configuration. Similar to other slender cylindrical structures such as the riser and umbilical, LWDPC is susceptible to vortex-induced vibration (VIV) under the combined action of waves, currents and FOWT motions, which accelerates fatigue and threatens reliability. At present, only a few studies have focused on this issue. Accordingly, this paper develops a numerical approach to model the VIV of a LWDPC by coupling the wake oscillator model (WOM) with the vector form intrinsic finite element (VFIFE) method. The WOM-VFIFE approach accounts for the geometric nonlinearity and large-deformation behaviour of the structure, and it considers the effect of incoming flow angle of attack in accordance with the independence principle (IP). Simulated static configurations and VIV responses are compared with the experimental data reported by Moideen et al. [1] to verify the accuracy of the proposed WOM-VFIFE approach. Subsequently, the VIV response characteristics of the LWDPC are examined over a range of incoming flow velocities and FOWT motion parameters.

Presenting Author: Shuo Gao Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University

Presenting Author Biography: Mr. Shuo Gao is currently a master's student at Tsinghua University, specialising in vortex-induced vibrations of risers and cables.

Authors:

Shuo Gao Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University
Zhipeng Yu Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University
Enhao Wang Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University