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fluid-structure interaction solver for compressible flows with applications to blast loading on thin elastic structures

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APPLIED MATHEMATICAL MODELLING 2017年 52卷 470-492页

作者： Bailoor, Shantanu Annangi, Aditya Seo, Jung Hee Bhardwaj, Rajneesh Indian Inst Technol Dept Mech Engn Bombay 400076 Maharashtra India Johns Hopkins Univ Dept Mech Engn Baltimore MD 21218 USA

In this study, we report the development and application of a fluid-structure interaction (FSI) solver for compressible flows with large-scale flow-induced deformation of the structure. The FSI solver utilizes a partitioned approach to strongly couple a sharp interface immersed boundary method-based flow solver with an open-source finite-element structure dynamics solver. The flow solver is based on a higher-order finite-difference method using a Cartesian grid, where it employs the ghost-cell methodology to impose boundary conditions on the immersed boundary. Higher-order accuracy near the immersed boundary is achieved by combining the ghost-cell approach with a weighted least squares error method based on a higher-order approximate polynomial. We present validations for two-dimensional canonical acoustic wave scattering on a rigid cylinder at a low Mach number and for flow past a circular cylinder at a moderate Mach number. The second order spatial accuracy of the flow solver was established in a grid refinement study. The structural solver was validated according to a canonical elastostatics problem. The FSI solver was validated based on comparisons with published measurements and simulations of the large-scale deformation of a thin elastic steel panel subjected to blast loading in a shock tube. The solver correctly predicted the oscillating behavior of the tip of the panel with reasonable fidelity and the computed shock wave propagation was qualitatively consistent with the published results. In order to demonstrate the fidelity of the solver and to investigate the coupled physics of the shock-structure interaction for a thin elastic plate, we employed the solver to simulate a 6.4 kg TNT blast loading on the thin elastic plate. The initial conditions for the blast were taken from previously reported field tests. Using numerical schlieren, the shock front propagation, Mach reflection, and vortex shedding at the tip of the plate were visualized during the impact o

关键词： Blast loading Compressible flow Flow-induced deformation fluid-structure interaction Immersed boundary method

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fluid-structure interaction in straight pipelines with different anchoring conditions

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JOURNAL OF SOUND AND VIBRATION 2017年 394卷 348-365页

作者： Ferras, David Manso, Pedro A. Schleiss, Anton J. Covas, Didia I. C. Ecole Polytech Fed Lausanne Lab Hydraul Construct CH-1015 Lausanne Switzerland Univ Lisbon Inst Super Tecn CERIS P-1699 Lisbon Portugal

This investigation aims at assessing the fluid-structure interaction (FSI) occurring during hydraulic transients in straight pipeline systems fixed to anchor blocks. A two mode 4-equation model is implemented incorporating the main interacting mechanisms: Poisson, friction and junction coupling. The resistance to movement due to inertia and dry friction of the anchor blocks is treated as junction coupling. Unsteady skin friction is taken into account in friction coupling. Experimental waterhammer tests collected from a straight copper pipe-rig are used for model validation in terms of wave shape, timing and damping. Numerical results successfully reproduce laboratory measurements for realistic values of calibration parameters. The novelty of this paper is the presentation of a 1D FSI solver capable of describing the resistance to movement of anchor blocks and its effect on the transient pressure wave propagation in straight pipelines. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Junction coupling Poisson coupling Friction coupling Dry friction Skin friction Straight pipelines

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fluid-structure interaction analysis of an impeller for a high-pressure booster pump for seawater desalination

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2017年第11期31卷 5319-5328页

作者： Yin, Tingyun Pei, Ji Yuan, Shouqi Osman, Majeed Koranteng Wang, Jiabin Wang, Wenjie Jiangsu Univ Natl Res Ctr Pumps Zhenjiang 212013 Peoples R China Shandong Shuanglun Co Ltd Weihai 264203 Peoples R China

A High-pressure booster pump (HPBP) is an essential piece of equipment in a Seawater reverse osmosis (SWRO) system. As the corerotating component in the HPBP, the impeller operates extensively in a high-pressure and corrosive environment and its work status directly affects the reliability of the pump device. The vibration characteristics of the rotor were analyzed using fluid-structure interaction theory to determine the characteristics that would ensure the long-term safe operation of the HPBP. The stress and deformation analysis was performed on a partitioned solution for an impeller in a moving fluid, and the modal analysis of the impeller was conducted in still fluid based on a monolithic solution. The influence of the impeller shroud thickness on the resulting vibration characteristics was investigated by using three modifications of the impeller. A comparison of the results with the initial impeller geometry was then carried out under partial load operations. Three commonly used materials for an impeller were also evaluated. The three-dimensional turbulent flow was modeled utilizing the SST k-omega turbulence model, and the numerical results were verified by the experimental data. The results show that natural frequency of the 20CrMnTi is the highest among the three materials for each order mode, followed by 00Cr17Ni14Mo2Ti (316L) and HT250Ni2Cr. Increasing the rear shroud thickness would result in a notable reduction in its deformation. Evidently, the thicker the front and rear shrouds, the lower the shroud deformations. Among the three operating points, the displacement fields of the impeller were quite akin. An outward displacement growth was observed within the impeller hub to the outer diameter, thereby leaving both shrouds with a local maximum on the blade passage. Additionally, higher equivalent stress values were observed at the junction between the blade and the shroud. These results reveal the deformation and stress affecting the impeller, which the

关键词： High-pressure booster pump fluid-structure interaction Vibration characteristics Seawater desalination

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Procedure for 2D fluid-structure interaction simulation

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JOURNAL OF ALGORITHMS & COMPUTATIONAL TECHNOLOGY 2019年第13期13卷 -页

作者： Zorn, Joshua E. Davis, Roger L. Univ Calif Davis Dept Mech & Aerosp Engn 1 Shields Ave Davis CA 95616 USA

A numerical technique for the solution of the structural dynamics equations of motion is presented. The structural dynamics mass and momentum conservation equations are solved using a control volume technique which is second-order accurate in space along with a dual time-step scheme that is second order accurate in time. The momentum conservation equation is written in terms of the Piola-Kirchoff stresses and the displacement velocity components. The stress tensor is related to the Lagrangian strain and displacement tensors using the St. Venant-Kirchoff constitutive relationship. Source terms are included to account for surface pressure and body forces. Verification of the structural dynamics solution procedure is presented for a two-dimensional vibrating cantilever beam. In addition, the structural dynamics solution procedure has been implemented into a general purpose two dimensional conjugate heat transfer solution procedure that uses a similar dual time-step control volume technique to solve the fluid mass, energy, and Navier-Stokes equations as well as the structural energy heat conduction equation. The resulting overall solution procedure allows for solutions to fluid/structure, fluid/thermal, or fluid/thermal/structure interaction problems. Verification of the multidisciplinary procedure is performed using a cylinder with a flexible solid protruding downstream that mimics a cylinder-flag configuration. The approach is a proof of concept for compressible flow with continuum based solids. The methods are currently being extended to 3D flow fields and solids.

关键词： Computational fluid dynamics finite volume method fluid-structure interaction numerical methods structural dynamics

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fluid-structure-interaction in butterfly valves for hydropower: A numerical and experimental study

Results in Engineering

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Results in Engineering 2025年 27卷

作者： M. Berger L. Zingerle Ch Mayerl T. Senfter M. Pillei Dept. of Medical Technologies MCI - The Entrepreneurial School Austria Dept. of Industrial Engineering & Management MCI - The Entrepreneurial School Austria

Butterfly valves are crucial in hydropower plants by controlling water flow in penstocks, requiring both streamlined geometries for minimal energy loss and high structural stiffness for emergency closure scenarios. Traditional design approaches often use static pressure loads, leading to conservative estimations and potential efficiency losses of up to 3 %. This study presents a numerical investigation and experimental validation of the fluid-structure interaction (FSI) of a butterfly valve, combining Computational fluid Dynamics (CFD) and Finite Element Analysis (FEA). The focus of this work is experimental validation and numerical simulations for both the fluid flow and structural deformation within butterfly valves used in hydropower plants. The presented approach captures deformation due to FSI of a slender structure under hydraulic load with non-invasive methods, both DIC and PIV. Both one- and two-way coupled simulations were investigated. The numerical results are validated through 2D/2C Particle Image Velocimetry (PIV) measurements of the flow field and Digital Image Correlation (DIC) for non-invasive deformation analysis. A mean absolute error of approximately 10 % between CFD and experimental data confirms the model’s reliability under operating conditions, while larger deviations at extreme angles highlight the limitations of 2D measurement techniques. The validated multi-physics simulation framework provides new insights into the deformation and stresses of bodies under flow conditions and vortex propagation effects in butterfly valves, but also the limitations that come with it.

关键词： fluid-structure interaction Computational fluid dynamics Finite element analysis Butterfly valve Hydropower Particle image velocimetry Digital image correlation

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fluid-structure interaction simulation of a cerebral aneurysm: Effects of endovascular coiling treatment and aneurysm wall thickening

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JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 2017年 74卷 72-83页

作者： Shamloo, Amir Nejad, Milad Azimi Saeedi, Milad Sharif Univ Technol Dept Mech Engn Tehran Iran

In the present study, we investigate the effect of the hemodynamic factors of the blood flow on the cerebral aneurysms. To this end, a hypothetical geometry of the aneurysm in the circle of Willis, located in the bifurcation point of the anterior cerebral artery (ACA) and anterior communicating artery (ACoA) is modeled in a three-dimensional manner. Three cases are chosen in the current study: an untreated thin wall (first case), untreated thick wall (second case), and a treated aneurysm (third case). The effect of increasing the aneurysm wall thickness on the deformation and stress distribution of the walls are studied. The obtained results showed that in the second case, a reduction in the deformations of the walls was observed. It was also shown that the Von Mises stress has a 10% reduction in the untreated thick wall aneurysm compared to the untreated thin wall aneurysm. Thus, increasing the thickness of the aneurysm wall can be proposed as temporary remedial action. In the third case, an aneurysm that has been treated by endovascular coiling is investigated. The deformation and Von Mises stress in this case was decreased more than 43% and 87% compared to the first case, respectively. The wall shear stress distribution due to the fluid flow in the first and second cases showed small amounts of shear stress on the aneurysm sac. In these two cases, the oscillatory shear index was measured to have an approximate value of 0.47 in the aneurysm region, though, this value was measured to be about 0.1 for the third case. The hybrid effect of the wall shear stress and the oscillatory shear index on the relative residence time (RRT) was also studied. When this parameter reaches its maximum, the aneurysm rupture may occur. It was shown that by treating the aneurysm (the third case), RRT parameter can be decreased 200 times relative to the first and second cases, which suggests an appropriate treatment of the aneurysm by choosing the coiling method.

关键词： Cerebral aneurysm Aneurysm wall thickening Endovascular coiling treatment Vessel wall hyperelastic behavior fluid-structure interaction Non-Newtonian properties of blood

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Level set function-based immersed interface method and benchmark solutions for fluid flexible-structure interaction

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2019年第3期91卷 134-157页

作者： Thekkethil, Namshad Sharma, Atul Indian Inst Technol Dept Mech Engn Mumbai 400076 Maharashtra India

Using a hybrid Lagrangian-Eulerian approach, a level set function-based immersed interface method (LS-IIM) is proposed for the interaction of a flexible body immersed in a fluid flow. The LS-IIM involves finite volume method for the fluid solver, Galerkin finite element method for the structural solver, and a block-iterative partitioned method-based fully implicit coupling between the two solvers. The novelty of the proposed method is a level set function-based direct implementation of fluid-solid interface boundary conditions in both the solvers. Another novelty is the computation of the level set function from a geometric method instead of differential equations commonly used in level set methods-the novel geometric as compared to the traditional method is found to be more accurate and less time-consuming. The LS-IIM is demonstrated as second-order accurate. Verification study is presented first separately for both the solvers and then together for four fluid-structure interaction (FSI) problems, with different levels of complexity including lid-driven flow, channel flow, and free-stream flow. Benchmark solutions are presented for two class of FSI problems: first, easy to set up and less time-consuming and, second, a reasonably challenging and complex FSI problem involving sharp edges and forced-motion of the flexible structure. The benchmark solutions are proposed at steady state for the first problem, after a verification study with two open-source solvers and, at periodic state, after a validation with published experimental results for the second problem. Our benchmark solutions may be useful for verification study in future.

关键词： benchmark Eulerian-Lagrangian finite element finite volume fluid-structure interaction level set

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Oscillating Performance and fluid-structure interaction Mechanism of a Small Koi's Caudal Fin-Like Underwater Propulsion Actuated by MFC

Oscillating Performance and Fluid-Structure Interaction Mech...

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第六届国际仿生工程学术大会暨2019年自然启迪科技国际研讨会

作者： Junqiang Lou Yiling Yang Tehuan Chen Ningbo University

Macro Fiber Composite(MFC) exhibits significant advantages over conventional piezoelectric actuators, such as high actuation stress, large flexibility and excellent waterproof performance, and the disadvantage of frangibility is also overcome. Thus, MFC actuators have great potentials in the bio-inspired locomotion and flexible actuation applications. Mimicking the morphological characteristics and body or caudal fin(BCF) locomotion mode of koi fish, a small koi‘s caudal fin-like underwater propulsion is designed and fabricated. Experimental results show the maximum underwater oscillating velocity of the propulsion is 154.5 mm/s. Computational fluid dynamic(CFD) simulations for the vortexes formation and fluid-structure interaction mechanism caused by the oscillating propulsion are conducted. Simulation results show a pair of counter-rotating vortices always can be seen near the center of the caudal fin elongation. With the Peak-to-Peak actuation of 1000 V, at 7.5 Hz, and mean and maximum instantaneous thrust of the propulsion in the stable oscillating periods are 4.22 mN and 9.8 mN, respectively. Those results are in good agreement with the Lighthill‘s slender body theory. Meanwhile, the cycle-averaged velocity fields show a pair of counter-rotating vortices just downstream of the propulsion tip and running parallel. There is a high velocity region between the neighboring counter-rotating vortices, and the maximum flow velocity in this region is 2 times the oscillating velocity of the propulsion. Accordingly, a jet ejecting from the propulsion tip and spreading out in the downstream direction is observed. Thus, the underwater propulsion is pushed forward by the reaction force of the pseudo-jet. The propulsion mechanisms of proposed biomimetic underwater propulsion are demonstrated.

关键词： Caudal Fin of Koi Fish Underwater propulsion Macro Fiber Composite （MFC） fluid-structure interaction Body or Caudal Fin（BCF） mode

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fluid structure interaction with a finite rate chemistry model for simulation of gaseous detonation metal-forming

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2019年第41期44卷 23289-23302页

作者： Rokhy, Hamid Soury, Hossein Amirkabir Univ Technol Dept Aerosp Engn Tehran Iran Malek Ashtar Univ Technol Dept Chem & Chem Engn POB 15875-1774 Tehran Iran

Numerical simulation of metal-forming by gaseous detonation in a stoichiometric mixture of H2-O2 is performed in this paper, utilizing the Space-Time Conservation Element and Solution Element (CESE) method. We employ the CESE method to solve the reacting flow equations, including realistic finite-rate chemistry model. The detonation mechanism is considered by a detailed mechanism of the seven species and sixteen reactions for H2-O2 mixture. The fluid-structure interface treatments smoothly handle between detonation wave and work piece by using the immersed boundary method (IBM). To accurately predict the behavior of the work piece, the fluid (CESE) solver was coupled with the LS-DYNA (R) FEM structural solver. The fluid solver applies the fluid pressure on the structural elements as external boundary conditions and feeds back the displacements and velocity of the interface from the structural solver as its new boundary, while the chemistry solver preparing all source terms in the conservation equation for fluid solver. Our purpose is to evaluate the accuracy of CESE-IBM FSI method to handle the gaseous detonation metal-forming, which is a very complex FSI problem with chemistry. After a description of CESE-IBM FSI method, finite-rate chemistry model and experimental test set-up, a comparison is performed through the detonation characteristics, midpoint deflection of the work piece, and effect of initial pressure and temperature of the gas mixture. A good agreement is obtained between numerical results and empirical data. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Gaseous detonation Stoichiometric H-2-O-2 mixture fluid-structure interaction CESE-IBM FSI method

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Fatigue Life Analysis of Liquid-Filled Pipeline Under the Combined Excitation of Random Vibration and fluid-structure interaction

Fatigue Life Analysis of Liquid-Filled Pipeline Under the Co...

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Prognostics and System Health Management Conference (PHM-Chongqing)

作者： Zhu, Lei Jiang, Yu Fan, Zhengwei Yu, Dianlong Natl Univ Def Technol Lab Sci & Technol Integrated Logist Support Changsha Hunan Peoples R China

ISBN: (纸本)9781538653807

The objective of this article is aiming at the fatigue problem of the liquid-filled pipeline, which is under the combined excitation of the external complex random loads and the internal fluid-structure interaction vibration caused by the high-pressure and high-speed fluid in the pipeline. By means of theory analysis and simulation, the combined excitation of the liquid-filled pipeline under the complex random load and fluid-structure interaction vibration was studied, and the calculation method of pipeline fatigue life under the combined excitation was given. Based on this, taking the typical ship liquid-filled pipeline as research object, ANSYS Workbench finite element simulation software was used to analyze the pipeline fatigue life under the combined excitation of random vibration and fluid-structure interaction vibration. All these conclusions can provide references for the anti-fatigue design and service life assessment of the ship's pipeline structure.

关键词： liquid-filled pipeline random vibration fluid-structure interaction combined excitation fatigue life ANSYS Workbench

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