Affiliation:
1. School of Engineering, Ocean University of China, Qingdao 266404, China
Abstract
Based on the slicing method and overlapping grid method, the bidirectional and sequential coupling of the fluid domain and riser structure is realized by UDF programming. A numerical model of vortex-solid coupling is constructed to study vortex-induced vibration characteristics of risers with different velocity ratios and different oscillation frequencies under the effect of superimposed oscillating flow. With the increase of the velocity ratio, a higher order formation appeared in the transverse vibration envelope of the riser. Meanwhile, with the increase of oscillation frequency, the vertical tube vibration envelope changed from “symmetrical up and down” to “wide up and narrow down”. There is an obvious process of “establishment”, “locking” and “decay” in the transverse-flow displacement of the riser to dimensionless, and the proportion of the “locking” phase increases gradually with the flow rate ratio, changing from 0.50 to 0.62. The effect of the oscillation frequency of the superimposed flow on the proportion of the “locked” stage is not evident. When the oscillation frequency is 0.25f1, the proportion of the “locked” stage of the riser reaches 50%.
Funder
the NSFC and Shandong Province
the Major Science and Technology Innovation Project in Shandong Province
the Natural Science Foundation of Shandong Province
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science
Reference20 articles.
1. Influence of mass ratio on two-dimensional coupled vibration characteristics of deepsea risers;Zhang;J. Ship Mech.,2022
2. Aerodynamic damping models for vortex-induced vibration of a rectangular 4:1 cylinder: Comparison of modeling schemes;Zhang;J. Wind. Eng. Ind. Aerodyn.,2020
3. Numerical explorations of the vortex-induced vibration of a streamlined box girder with water-filled barriers;Wang;J. Wind. Eng. Ind. Aerodyn.,2023
4. Duan, M., Wan, D., and Xue, H. (July, January 26). Prediction of Response for Vortex-Induced Vibrations of a Flexible Riser Pipe by using Multi-Strip Method. Proceedings of the Twenty-sixth (2016) International Ocean and Polar Engineering Conference, Rhodes, Greece.
5. Numerical analysis of multi-modal vibrations of a vertical riser in step currents;Yu;Ocean. Eng.,2018