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Numerical study on fluid-structure interaction of a cylinder-flexible thin beam under an axial magnetic field
Received date: 2025-03-10
Revised date: 2025-04-29
Online published: 2025-05-26
This paper conducts a numerical study on the problem of flow-induced vibration under an axial magnetic field. The finite element method is used to simulate the velocity field of the metal fluid under the combined effects of the magnetic field and the vibration of a cylinder-flexible beam. This research analyzes the influence of magnetic field intensity and flexible beam length on the amplitude， vibration frequency of the flexible beam， and the flow characteristics of the flow field. The results indicate that the flexible beam undergoes periodic vibrations due to vortex shedding effects， and the dominant vibration mode exhibits a close resemblance to the first-order natural mode of an Euler-Bernoulli beam. As the magnetic field intensity increases， the unsteady flow in the flow field is suppressed， resulting in a decrease in the amplitude of the flexible beam. Increasing the length of the flexible beam decreases the vibration frequency， while the amplitude shows a nonlinear relationship that first increases and then decreases. Regarding the vortex shedding characteristics of the flow field， an increase in magnetic field intensity promotes vortex dissipation， and reduces the frequency of vortex shedding. Additionally， the longer the flexible beam， the greater the energy dissipation during its interaction with the cylinder shear layer， which significantly changes the vortex shedding pattern； the critical Hartmann number for the transition from vortex shedding flow to steady flow decreases with the increase in the flexible beam length.
Qilong ZHANG , Jie WANG , Nianmei ZHANG . Numerical study on fluid-structure interaction of a cylinder-flexible thin beam under an axial magnetic field[J]. Journal of University of Chinese Academy of Sciences, 2026 , 43(5) : 694 -705 . DOI: 10.7523/j.ucas.2025.029
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