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Simulation Analysis and Experimental Investigation on the fluid-structure interaction Vibration Characteristics of Aircraft Liquid-Filled Pipelines under the Superimposed Impact of External Random Vibration and Internal Pulsating Pressure

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APPLIED SCIENCES-BASEL 2024年第17期14卷 8008页

作者： Zhu, Lei Chen, Chang Jiang, Yu Natl Univ Def Technol Adm & Support Dept Changsha 410073 Peoples R China Natl Univ Def Technol Coll Intelligence Sci & Technol Changsha 410073 Peoples R China

This paper investigated the fluid-structure interaction vibration response of an aircraft liquid-filled pipeline under external random vibration and internal pulsating pressure. First, the fluid-structure interaction solution is theoretically analyzed, and the advantages and disadvantages of the direct coupling method and the separation coupling method are compared, with the latter chosen as the simulation analysis method in this study. Second, taking the U-shaped oil pipeline of an aircraft engine as an example, simulation modeling was performed to compare and analyze the fluid-structure interaction vibration response of aircraft liquid-filled pipelines under different working conditions, obtaining the vibration response characteristics of stress danger points under various conditions. Finally, a test bench for an aircraft liquid-filling pipeline was built to explore the influence of external random vibrations with different kurtoses, different pipe wall thicknesses and different working conditions on the vibration response danger points of aircraft liquid-filling pipelines, verifying the simulation conclusions and providing a basis for aircraft liquid-filling pipeline design.

关键词： fluid-structure interaction vibration characteristics aircraft liquid-filled pipeline

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A fluid-structure interaction study to analyze the severity of carotid artery stenosis at different locations and its effect on various hemodynamic biomarkers

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EUROPEAN JOURNAL OF MECHANICS B-fluidS 2024年 106卷 227-237页

作者： Shakya, Kshitij Chowdhury, Shubhajit Roy Indian Inst Technol Mandi Sch Comp & Elect Engn Mandi 175005 Himachal Prades India

The study on arterial stenosis has gained rapid interest among researchers in the last decade because of its chronic consequences. Several researchers have tried to investigate stenosis and plaque progression in the carotid artery with different simulation models. In this study, a realistic 3-D geometry of the carotid artery has been used to analyze the effect of varying degrees of stenosis present at different locations of the carotid artery on various hemodynamic parameters. An extensive range of stenosis degrees, starting from a healthy artery(0 %stenosis) to 10%, 30%, 50%, 75%, and 90% stenosis, have been studied. These degrees of stenosis were planted at different locations of the artery grown simultaneously. The whole study was done under the realm of fluid-structure interaction multiphysics. The change in velocity profiles at the areas of stenosis has been found along with the wall shear stress and arterial displacement. The magnitude of velocity and wall shear stress in the case of multiple stenosis locations has been found to be dependent on each other. The presence or absence of one stenosis affects the other, and given the regular and irregular patterns of the velocity profile, wall shear stress, and displacement, their inclusion in blood flow simulation studies having multiple stenoses should be considered.

关键词： Blood flow Carotid artery bifurcation fluid-structure interaction Multiple stenosis Wall shear stress

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Modeling fluid-structure interaction using smoothed particle hydrodynamics and constitutively informed particle dynamics

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COMPUTERS & fluidS 2024年 276卷

作者： Paravastu, Phanindra Vedantam, Srikanth Indian Inst Technol Madras Dept Engn Design Chennai 600036 India

In this paper, we present a novel fluid-structure interaction framework based on the smoothed particle hydrodynamics model for fluids and a recently developed constitutively informed particle dynamics model for solids. We develop a new method for coupling these approaches to expand the fluid-structure simulation framework to include crack propagation failure in the solid. Several benchmark problems have been simulated to validate the fluid and solid models separately as well as the coupled model. We then apply this coupled approach to model brittle failure of a notched bar impacted by a fluid. We study the effect of various parameters such as height of the obstacle and location of the notch on its fracture.

关键词： fluid-structure interaction Smoothed particle hydrodynamics Particle based methods

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Estimation of added effects and their frequency dependence in various fluid-structure interaction problems

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JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2024年第11期46卷 1-17页

作者： Urban, Ondrej Pochyly, Frantisek Haban, Vladimir Litostroj Engn AS Technicka 3029 Brno 61600 Czech Republic Brno Univ Technol Energy Inst Fac Mech Engn Viktor Kaplan Dept Fluid Engn Technicka 2896-2 Brno 61669 Czech Republic

This paper focuses on a fluid-structure interaction topic-the determination of added effects caused by fluid forces acting on a body, considering the standard linear equation of motion. We present various problems that assume small-displacement oscillations of single and multiple bodies in inviscid irrotational (potential) flow or viscous incompressible flow in both closed domain and external flow. For inviscid flow, effects of geometric parameters on the added effects were studied. The presented results extend results known from the literature. For viscous flow, frequency dependence of the added effects was studied for a wide range of frequency. The added effects were computed from data from numerical simulations of fluid flow, where the body oscillations were modeled using the dynamic mesh approach. Effects of the phase shift caused by the dynamic mesh were addressed. The added mass was compared with the corresponding value determined for inviscid flow where applicable. The results show strong dependence of the added effects on many parameters, making their proper computation challenging even for simplified cases.

关键词： Added effects fluid-structure interaction Small-displacement oscillations Rotordynamics

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Blade Wrap Angle Impact on Centrifugal Pump Performance:Entropy Generation and fluid-structure interaction Analysis

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 109-137页

作者： Hayder Kareem Sakran Mohd Sharizal Abdul Aziz Chu Yee Khor School of Mechanical Engineering Universiti Sains MalaysiaEngineering CampusNibong TebalPenang14300Malaysia Chemical Engineering Department Faculty of EngineeringAl-Muthanna UniversityMuthanna66001Iraq Faculty of Mechanical Engineering&Technology Universiti Malaysia Perlis(UniMAP)ArauPerlis02600Malaysia

The centrifugal pump is a prevalent power equipment widely used in different engineering patterns,and the impeller blade wrap angle significantly impacts its performance.A numerical investigation was conducted to analyze the influence of the blade wrap angle on flow characteristics and energy distribution of a centrifugal pump evaluated as a low specific speed with a value of *** study investigates six impellermodels that possess varying blade wrap angles(95°,105°,115°,125°,135°,and 145°)that were created while maintaining the same volute and other geometrical *** investigation of energy loss was conducted to evaluate the values of total and entropy generation rates(TEG,EGR).The fluid-structure interaction was considered numerically using the software tools ANSYS Fluent and *** elastic structural dynamic equation was used to estimate the structural response,while the shear stress transport k–ωturbulence model was utilized for the fluid domain *** findings suggest that the blade wrap angle has a significant influence on the efficiency of the *** impeller featuring a blade wrap angle of 145°exhibits higher efficiency,with a notable increase of 3.76%relative to the original *** in the blade wrap angle impact the energy loss,shaft power,and pump *** model with a 145°angle exhibited a maximum equivalent stress of 14.8MPa and a total deformation of 0.084 *** results provide valuable insights into the intricate flow mechanism of the centrifugal pump,particularly when considering various blade wrap angles.

关键词： Centrifugal pump blade wrap angle entropy generation theory fluid-structure interaction hydraulic performance

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Implementation and Validation of an Original OpenFOAM Code for fluid-structure interaction Problems in Compressible Flow

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2025年第4期50卷 2335-2350页

作者： Benhamou, Abdessoufi Belghoula, Samir Miloud Lab Mech & Energy LME Chlef 02000 Algeria Hassiba Benbouali Univ Fac Technol Dept Mech Engn Chlef 02000 Algeria Hassiba Benbouali Univ Fac Civil Engn Dept Hydraul BP 78C Chlef 02180 Algeria

Simulating interactions involving compressible fluids with potential shock waves and highly deformable structures demands the precise capture of flow dynamics and structural responses. This coupling must effectively manage substantial deformations while adapting to changes in the fluid domain's topology. This study focuses on the rhoSonicFsiFoam solver, developed using the open-source computational fluid dynamics (CFD) software, OpenFOAM. The computational approach addresses aeroelasticity, fluid compressibility and advanced coupling. Two tests were performed, with the first involving the beating of a thin plate in supersonic flow and the second featuring the interaction of a shock wave with a deformable plate. In the flutter test, simulation results intimately matched the theoretical Mach number of 2.2677, indicating a strong alignment between the numerical results of this present study (M infinity num is an element of 2.26,2.27\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$M_{\infty }<^>{{{\text{num}}}} \in \left] {2.26,2.27} \right[$$\end{document}) and theoretical expectations. Additionally, simulation results from the computational approach closely align with theoretical projections for plate fluttering and correlate well with experimental and numerical outcomes from the T80 shock tube. This project aims to unravel fluid-structure interaction by combining a robust solution method with the latest advancements in CFD. Leveraging this platform, the computational approach accurately captures aeroelastic phenomena, including shock waves and deformations during interactions with compressible fluid and deformable structures. Implications span aerospace, defense and energy sectors. In conclusion, this study underscores the pivotal role of advanced simulation techniques in comprehending int

关键词： fluid-structure interaction Compressible flow Aeroelasticity Numerical simulation rhoSonicFsiFoam

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Numerical modeling of the fluid-structure interaction during blood flow in a flexible stenotic aorta

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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 2024年 158卷

作者： Issakhov, Alibek Sabyrkulova, Aidana Abylkassymova, Aizhan Kazakh British Tech Univ Alma Ata Kazakhstan Al Farabi Kazakh Natl Univ Alma Ata Kazakhstan

The aim of this study is to understand the relationship between blood flow and vascular mechanics in stenotic and healthy arteries and use this understanding to improve the accuracy of computational models for predicting blood flow in human arteries. The article considers four models: a flexible and rigid model of a healthy artery and two flexible arteries with stenoses of various shapes. The deformation of a blood vessel is modeled as a fluidstructure interaction (FSI). The arterial wall is modeled as an isotropic, linearly elastic material, and wall shear stress (WSS) is calculated in order to explore the correlation between induced flow stress and the shape of the artery geometry. Blood is considered as an incompressible non-Newtonian fluid, described by the Carreau viscosity model. Signals of physiological pressure and velocity are used as boundary conditions, which ensure the pulsating nature of the flow. Numerical results show that the developed model predicts vessel deformations and describes their influence on pressure distribution, pressure drop and wall shear stresses. The results of the healthy FSI model are compared with the results of the rigid wall model in order to evaluate the effect of wall elasticity on wall shear stress distribution. Thus, under pathological conditions, the maximum speed value was observed in the model with 40% stenosis and reached 2.16 m/s, while the model with 30% stenosis had a speed of 2.06 m/s. In this case, the maximum displacement of the walls during the cardiac cycle was observed in the artery with 40% stenosis. The deformation value exceeded the wall thickness by 3.3 times and reached 1.66 mm.

关键词： Numerical simulation fluid-structure interaction Pulsatile Arterial stenosis Wall shear stress Aorta Flexible wall

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A finite element framework for fluid-structure interaction of turbulent cavitating flows with flexible structures

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COMPUTERS & fluidS 2024年 277卷

作者： Darbhamulla, Nihar B. Jaiman, Rajeev K. Univ British Columbia Dept Mech Engn Vancouver BC V6T 1Z4 Canada

We present a finite element framework for the numerical prediction of cavitating turbulent flows interacting with flexible structures. The vapor-fluid phases are captured through a homogeneous mixture model, with a scalar transport equation governing the spatio-temporal evolution of cavitation dynamics. High-density gradients in the two-phase cavitating flow motivate the use of a positivity-preserving Petrov-Galerkin stabilization method in the variational framework. A mass transfer source term introduces local compressibility effects arising as a consequence of phase change. The turbulent fluid flow is modeled through a dynamic subgrid-scale method for large eddy simulations. The flexible structure is represented by a set of eigenmodes, obtained through a modal decomposition of the linear elasticity equations. While a partitioned iterative approach is adopted to couple the structural dynamics and cavitating fluid flow, the deforming flow domain is described by an arbitrary Lagrangian-Eulerian frame of reference. We establish the fidelity of the proposed framework by comparing it against experimental and numerical studies for both rigid and flexible hydrofoils in cavitating flows. Under unstable partial cavitating conditions, we identify specific vortical structures leading to cloud cavity collapse. We further explore features of cavitating flow past a rigid body such as re-entrant jet and turbulence-cavity interactions during cloud cavity collapse. Based on the validation study conducted over a flexible NACA66 rectangular hydrofoil, we elucidate the role of cavity and vortex shedding in governing the structural dynamics. Subsequently, we identify a broad spectrum frequency band whose central peak does not correlate to the frequency content of the cavitation dynamics or the natural frequencies of the structure, indicating the induction of unsteady flow patterns around the hydrofoil. Finally, we discuss the coupled fluid- structure dynamics during a cavitation cycle

关键词： fluid-structure interaction Cavitation Stabilized finite element Partitioned iterative Large eddy simulation Flexible hydrofoil

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Reduced-order model of geometrically nonlinear flexible structures for fluid-structure interaction applications

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INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS 2024年 158卷

作者： Flament, T. Deu, J. -F. Placzek, A. Balmaseda, M. Tran, D. -M. Univ Paris Saclay DAAA ONERA F-92322 Chatillon France HESAM Univ LMSSC Cnam EA4626 F-75003 Paris France Univ Paris Saclay DAAA ONERA F-92190 Meudon France

This paper deals with the numerical computation, via a reduced order models (ROM), of the vibrations of geometrically nonlinear structures triggered by the aeroelastic coupling with a fluid flow. The formulation of the ROM proposed in this paper is based on the projection on a basis of reduced dimension enhanced with dual modes. An explicit expression of the projected nonlinear forces is computed in a non-intrusive way based on the Implicit Condensation method. The resulting ROM is an improvement of the classical ICE method since the effects of membrane stretching are taken into account in the resolution of the dynamic equation of motion. Such a ROM aims to be adapted to follower aerodynamic unsteady loads. The construction of the ROM is first detailed and validated under several load cases on a Euler-Bernoulli beam with von Karman hypothesis. Then a fluid-structure partitioned coupling on a two-dimensional example involving vortex-induced vibrations is considered to demonstrate the capability of such ROM to replace a nonlinear FE solver. In this paper, the limitations of the ICE method are highlighted in the examples treated, while the ROM proposed overcomes such limitations and captures accurately the dynamics.

关键词： Computational dynamics Geometric nonlinearity Nonlinear model order reduction fluid-structure interaction Aeroelasticity Dual modes Euler-Bernoulli/von Karman beam

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The fluid-structure interaction response of composite auxetic re-entrant honeycomb structures to underwater impact

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THIN-WALLED structureS 2024年 196卷

作者： Liu, Jiayi He, Xiaolong Liu, Zhikang Cao, Xiaoming Yu, Sheng Huang, Wei Huazhong Univ Sci & Technol Sch Naval Architecture & Ocean Engn Wuhan 430074 Peoples R China Hubei Key Lab Naval Architecture & Ocean Engn Hydr Wuhan 430074 Peoples R China Wuhan Second Ship Design & Res Inst Wuhan 430064 Peoples R China

In this paper, the effects of the gradient form, peak pressure and decaying time on the fluid-structure interaction of composite auxetic re-entrant honeycomb structures was experimentally and numerically investigated. The specimens for this experiment were manufactured by hot-press molding method. The acrylic transparent tube was utilized to accommodate water medium, pistons and specimen during experiment. The exponential decaying shock wave was simulated by accelerating the fly plate to impact the piston based on the one-stage light gas gun system. The incident velocity of the fly plate and process of the fluid-structure interaction response were monitored by high frame rate camera. In addition, the velocity of the shock wave in water was measured by transducers installed at different measuring points. The voltage signal of the dynamic overpressure collected by transducers was amplified by the charge amplifier and recorded by the oscilloscope. On the other hand, finite element software Abaqus/Explicit was applied to simulate the cavitation process of water domain and dynamic response of specimens. The experimental results and numerical results were in good agreement. The results indicated that the increase of the thickness of the fly plate had a certain effect on the propagation velocity of the shock wave, and the increase of the peak pressure would make the cavitation generation position close to the fluid-structure interface and make the cavitation duration longer. And the average structure which has a minimum transformation of 8.12 mm shows better underwater impact resistance than the gradient structure.

关键词： Underwater impact fluid-structure interaction Re-entrant honeycomb core Shock wave Cavitation

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