Search

This paper addresses the challenges in studying the interaction between high‐intensity sound waves and large‐deformable hyperelastic solids, which are characterized by nonlinearities of the hyperelastic material, the finite‐amplitude acoustic wave, and the large‐deformable fluid–solid interface. An implicit coupling method is proposed for predicting nonlinear structural‐acoustic responses of the large‐deformable hyperelastic solid submerged in a compressible viscous fluid of infinite extent. An arbitrary Lagrangian–Eulerian (ALE) formulation based on an unsplit complex‐frequency‐shifted perfectly matched layer method is developed for long‐time simulation of the nonlinear acoustic wave propagation without exhibiting long‐time instabilities. The solid and acoustic fluid domains are discretized using the finite element method, and two different options of staggered implicit coupling procedures for nonlinear structural‐acoustic interactions are developed. Theoretical formulations for stability analysis of the implicit methods are provided. The accuracy, robustness, and convergence properties of the proposed methods are evaluated by a benchmark problem, that is, a hyperelastic rod interacting with finite‐amplitude acoustic waves. The numerical results substantiate that the present methods are able to provide long‐time steady‐state solutions for a nonlinear coupled hyperelastic solid and viscous acoustic fluid system without numerical constraints of small time step sizes and long‐time instabilities. The methods are applied to investigate nonlinear dynamic behaviors of coupled hyperelastic elliptical ring and acoustic fluid systems. Physical insights into 2:1 and 4:2:1 internal resonances of the hyperelastic elliptical ring and period‐doubling bifurcations of the structural and acoustic responses of the system are provided. [ABSTRACT FROM AUTHOR]

BackgroundThe flow induced vibration of spiral tube bundle widely exists engineering practice. The traditional fluid medium is water and air, whilst lead bismuth fluid has gradually become a new heat exchange medium in recent years.PurposeThis study aims to analyze the flow induced vibration of single row tube bundle in cross lead bismuth flow.MethodsThe computational fluid dynamics (CFD) analysis code FLUENT and the finite element analysis code ANSYS were used to simulate the flow induced vibration of a single row spiral tube bundle. The flow field profile and structural response at different times were analyzed respectively, and the corresponding relationship between the flow field change and structural vibration was explored. The physical insight into the flow induced vibration of the tube bundle was provided.Results & ConclusionsSimulation results show that the vortex shedding occurs in the single row tube bundle in the cross lead bismuth, and the frequency of vortex shedding increases with the increase of the flow velocity. Due to the interference of vortex shedding between the pipes, the vibration frequency of the middle pipe is mainly two times of vortex shedding frequency, while the vibration response of the pipes on both sides is dominated by the vortex shedding frequency, accompanied by a small frequency doubling. With the increase of the flow velocity, the influence of the interference between pipelines on the frequency doubling vibration response of pipeline vibration is gradually weakened. When the inlet velocity exceeds a certain value, the amplitude of the pipe increases suddenly, causing fluid-elastic instability of the pipelines.