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Semi-monolithic formulation based on a projection method for simulating fluid-structure interaction problems

COMPUTERS & MATHEMATICS WITH APPLICATIONS 2023年 134卷 207-224页

作者： Ha, Sang Truong Choi, Hyoung Gwon Quy Don Tech Univ Dept Mech Engn Hanoi Vietnam Seoul Natl Univ Sci & Technol Dept Mech & Automot Engn Seoul South Korea

For the simulation of fluid-structure interaction (FSI) problems, the monolithic method provides more robust convergence than the partitioned method but requires solving a larger matrix for a saddle-point problem that is difficult to precondition. We extend the existing semi-implicit method to propose a new semi-monolithic method for FSI simulation that uses a velocity boundary equation of a pressure Poisson equation so that only the pressure variables of the fluid domain are coupled with the displacement variables of the solid domain in a monolithic manner. The fluid domain is solved by employing a fractional four-step method for the incompressible Navier-Stokes equations based on an arbitrary Lagrangian-Eulerian (ALE) formulation, and the solid domain is solved by an updated Lagrangian method for simulating large nonlinear deformations. We applied the proposed method to 2D/3D benchmark problems with various time steps and density ratios, and the results confirmed that FSI problems with not only a strong added-mass effect but also a large deformation are simulated well. The proposed method is faster than the existing monolithic method because it solves a smaller matrix whose diagonal blocks are diagonally dominant matrices, which are much easier to precondition.

关键词： fluid-structure interaction Semi-monolithic method Pressure Poisson equation Large deformation Navier-Stokes equations

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Computational Methods and Representative Cases for fluid-structure interaction in Nuclear Reactor Vessel and Internals

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2025年第5期50卷 3591-3615页

作者： Veber, Pascal Tornberg, Fredrik Shams, Afaque Siddiqui, Osman K. Ringhals AB Varobacka Sweden Onsala Engn AB Kungsbacka Sweden King Fahd Univ Petr & Minerals KFUPM Dept Mech Engn Dhahran Saudi Arabia KFUPM Interdisciplinary Res Ctr Ind Nucl Energy IRC INE Dhahran Saudi Arabia

Flow-induced vibration (FIV) in nuclear reactor vessels has been extensively studied during the mechanical design of reactor vessels. Many power plants have increased the interest in coupled modern fluid and solid mechanics codes to facilitate the understanding of the phenomena causing damage to components termed fluid-structure interaction (FSI). A better understanding of these structure interactions is critical for enhancing safety, minimizing radiation risks, improving public health and safety, and fostering innovation in the nuclear industry. Furthermore, it supports nuclear energy as a clean alternative to fossil fuels, contributing to the reduction of global carbon emissions and advancing responsible production and consumption. Pressure wave propagation, acoustic resonance, flow-induced turbulence, and fluid-elastic instability are the four types of FSI-coupled systems that are investigated in this work. Different computational methods are presented to simulate FSI problems and should be selected depending on the physical complexity of the problems. One-way FSI where Computational fluid Dynamics (CFD) or thermal-hydraulics results are applied on a structural model is common, while FSI calculations with iterative fluid-structure simulations will be more and more available with the increase in computer capacity and the development of a more cost-effective turbulence model. Most modeling results have resulted in errors in the range of +/- 10% with the experimental data;however, in some cases, the choice of a different boundary condition has been shown to result in up to 30% errors.

关键词： Flow-induced vibration fluid-structure interaction Reactor vessel CFD Thermal-hydraulics

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fluid-structure interaction ANALYSIS OF A PERISTALTIC PUMP BY USING NUMERICAL AND EXPERIMENTAL METHODS

FLUID-STRUCTURE INTERACTION ANALYSIS OF A PERISTALTIC PUMP B...

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ASME Pressure Vessels and Piping Conference (PVP)

作者： Li, Qingye Zong, Chaoyong Zhang, Jianhua Zhang, Yanfeng Songa, Xueguan Dalian Univ Technol Sch Mech Engn Dalian 116023 Peoples R China Baoding Lead Fluid Technol Co Ltd Baoding 071000 Peoples R China Hebei Prov Fluid Precis Transmiss Technol Innovat Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9780791886168

Peristaltic pump is an important transport device which is widely used in industries involving pharmaceutical, petrochemical, biomedical, and food processing. For designed and/or optimized purpose, it is necessary to have a thorough understanding the mechanism of its dynamics. For this purpose, both numerical and experimental investigations have been performed in this paper. In the numerical study, a numerical model concerning two-way fluid-structure interaction (FSI) phenomenon is developed, where the Mooney-Rivlin hyper-elasticity model and dynamic mesh technique are employed to simulate a complete operating period of a peristaltic pump. For model verification, a series of experimental tests are performed and the results of the simulation and the tests were compared, which showed a good agreement. With the validated model, a detailed velocity and pressure distribution of a working period of the peristaltic pump is obtained, the mass flow rate is analyzed to illustrate the mechanism of the flow fluctuations.

关键词： fluid-structure interaction peristaltic pump numerical simulation hyper-elasticity model computational fluid dynamics

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Effect of Blade number on the Energy Dissipation and Centrifugal Pump Performance Based on the Entropy Generation Theory and fluid-structure interaction

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2024年第8期49卷 11031-11052页

作者： Sakran, Hayder Kareem Aziz, Mohd Sharizal Abdul Khor, C. Y. Univ Sains Malaysia Sch Mech Engn Engn Campus Perai 14300 Penang Malaysia Al Muthanna Univ Chem Engn Dept Fac Engn Muthanna Iraq Univ Malaysia Perlis Fac Mech Engn & Technol Arau Perlis Malaysia

fluid-structure interactions may impact the precision and reliability of the unsteady flow and rotor deflection investigation in the centrifugal pump. The energy transfer between fluid and solid could disregard due to ignorance of fluid-structure interaction. This study numerically examines a centrifugal pump's unsteady flow and structural characteristics under varied blade numbers. The entropy generation is computed and simulated numerically, considering the distributions of energy loss in the flow field. ANSYS Fluent and Workbench were employed to simulate the centrifugal pump. The elastic structural dynamic equation is used to predict the structure reaction. The shear stress transport k-omega turbulence model was conducted to simulate the fluid domain. The findings indicated that the head and shaft power increased with the increasing blade numbers at the hydraulic performance. The impeller with seven blades reached the maximum efficiency (78.7%), with an increase of 0.27% relative to the original model. Increasing the number of blades reduces pressure fluctuations at the pump output, and the impeller with nine blades shows a minimum value in pressure amplitude (4960.79 Pa). However, it increases the entropy generation (1.42 W/K) of the centrifugal pump. Variations in blade number affect the distribution and the fluctuation of the equivalent stress and the total deformation. The model with a nine blade exhibited minimum values of equivalent stress and total deformation with 5.74 MPa and 0.046 mm, respectively. This work may improve centrifugal pump operating stability by understanding how blade number affects pump flow and structural behavior and visualizing internal energy loss.

关键词： Centrifugal pump Blade numbers Entropy generation theory fluid-structure interaction

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Study on the dynamic characteristics of the free piston in the ionic liquid compressor for hydrogen refuelling stations by the fluid-structure interaction modelling

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2023年第65期48卷 25410-25422页

作者： Jin, Yi Guo, Yi Zhang, Shengtao Jiang, Jiacheng Peng, Xueyuan Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Peoples R China Shandong Himile Mfg Co LTD 1 Haomai Rd Weifang 261500 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

The ionic liquid compressor is promising for hydrogen refuelling stations, where the dynamic characteristics of the free piston are crucial for adjusting the compressor performance. This paper presents an investigation of the dynamic characteristics of the free piston in the ionic liquid compressor through a fluid-structure interaction modelling in three typical conditions. The results show that in the typical condition with no impact, phenomenons of buffering, oil charging, and oil overflow are observed in the oil pressure variation. Three features are found in the motion curve: asymmetric motion with a delay of reversal due to the buffering effect, variable location of the dead centre, and fluctuation in the piston velocity. When the impact occurs at the TDC, an opposite variation trend is observed in the gas and oil pressure curve. In the typical condition with impact at the BDC, the oil pressure drops below the atmospheric pressure.& COPY;2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Hydrogen energy Ionic liquid compressor Free piston fluid-structure interaction Dynamic characteristics

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A computational framework for drop time assessment of a control element assembly under fuel assembly deformations with fluid-structure interaction and frictional contact

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NUCLEAR ENGINEERING AND TECHNOLOGY 2024年第8期56卷 3450-3462页

作者： Lim, Dae-Guen Lee, Gil -Yong Park, Nam-Gyu Park, Yong-Hwa Korea Adv Inst Sci & Technol Dept Mech Engn 291 Daehak Ro Daejeon 34141 South Korea Korea Atom Energy Res Inst SMART Syst Dev Div 111 Daedeok Daero 989Beon Gil Daejeon 34057 South Korea KEPCO Nucl Fuel R&D Ctr 242 Daedeok Daero 989Beon Gil Daejeon 34057 South Korea

This paper presents a computational framework for drop time assessment of a control element assembly (CEA) under fuel assembly (FA) deformations. The proposed framework consists of three key components: 1) finite element modeling of CEA, 2) fluid-structure interaction to compute drag force, and 3) modeling of frictional contact between CEA and FA. Specially, to accommodate the large motion of CEA, beam elements based on absolute nodal coordinate formulation (ANCF) are adopted. The continuity equation is utilized to calculate the drag force, considering flow changes in the cross-sectional area during the CEA drop. Lastly, beam-inside-beam frictional contact model is employed to capture practical contact conditions between CEA and FA. The proposed framework is validated through experiments under two scenarios: free falls of CEA within FA, encompassing undeformed and deformed scenarios. The experimental validation of the framework demonstrated that the drop time of CEA can be accurately predicted under the complex coupling effects of fluid and frictional contact. The drop times of the S-shaped deformation case is longer than those of the C-shaped deformation case, affirming the time delay due to frictional force. The validation confirms the potential applicability to access the safety and reliability of nuclear power plants under extreme conditions.

关键词： Control element assembly drop simulation fluid-structure interaction Beam-inside-beam contact Experimental validation

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A multi-resolution smoothed particle hydrodynamics with multi-GPUs acceleration for three-dimensional fluid-structure interaction problems

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OCEAN ENGINEERING 2024年 296卷

作者： Chen, Ding Yao, Xuehao Huang, Dan Huang, Wenxiong Hohai Univ Dept Engn Mech Nanjing 211100 Peoples R China

This paper presents a parallel SPH of high efficiency to tackle fluid-structure interaction (FSI) problems involving large aspect ratio structures. A unified updated Lagrangian SPH algorithm is developed for modelling both the fluid and solid simultaneously, which involves employment of the Lagrangian kernel for modelling solids to avoid the tension instability problem. Considering the high computational cost of large-scale problems, we develop an adaptive multi-resolution SPH with multi-GPUs acceleration. Specifically, coupling CUDA and MPI acceleration modes are proposed, which exploit the high computational capacity of GPU devices and the crossdevice parallelism properties in multi-GPUs. To enhance the occupancy of each GPU, an efficient messagepassing pattern and load balancing algorithm are of interest. To address the data race in multi-resolution SPH, a combination hybrid competition mode is proposed. Through a series of optimization algorithms, the numerical efficiency of the multi-resolution SPH approach in multi-GPUs parallel computing is further promoted. After verifying the parallel efficiency of these proposed algorithms in some typical free-surface flows, the proposed model is applied to solve the FSI problem including under-water explosion problem. The results have demonstrated the effectiveness and applicability of the proposed accelerated algorithm for SPH modeling of large-scale FSI problems.

关键词： Smoothed particle hydrodynamics Multi-resolution Multi-GPUs fluid-structure interaction

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Research on the distribution structure of 2D piston electro-hydraulic pump based on fluid-structure interaction

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ADVANCES IN MECHANICAL ENGINEERING 2024年第10期16卷

作者： Qiu, Xin-Guo Chen, Kui-Ge Wu, Ping Zheng, Ying Wang, Chen Ji, Xing-Jian Zhejiang Univ Technol Coll Mech Engn 288 Liuhe Rd Hangzhou 310014 Zhejiang Peoples R China Minist Educ & Zhejiang Prov Key Lab Special Purpose Equipment & Adv Proc Techn Hangzhou Zhejiang Peoples R China

To address the drawbacks of traditional hydraulic power units, we embedded a 2D piston pump inside the motor rotor, proposing a 2D piston electro-hydraulic pump. The space cam mechanism serves as the primary force-bearing structure during its operation. Excessive wear occurs at the highest point of the space cam when subjected to significant axial forces, which leads to deviations between the motion law of the 2D piston and the theoretical design. Aiming this problem, we conduct research from two perspectives: theoretical analysis and fluid-structure interaction. Firstly, the operational principle of the electro-hydraulic pump is introduced. Then, the contact normal stress of the space cam mechanism is studied, and backflow and chamber pressure overshooting are discussed. Finally, the fluid-structure interaction model of the electro-hydraulic pump is established. Based on the fluid-structure interaction model, the effects of the width and depth angles of the triangular damping groove on the backflow and chamber pressure overshooting are analyzed. The simulation results demonstrate that adding triangular damping grooves can improve the flow field characteristics. With the increase in the width and depth angles, the peak flow of the backflow and chamber pressure overshooting increase, with the depth angle exerting a more pronounced effect.

关键词： 2D piston electro-hydraulic pump triangular damping groove backflow chamber pressure fluid-structure interaction

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Shape Gradient Methods for Shape Optimization of an Unsteady Multiscale fluid-structure interaction Model

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JOURNAL OF GEOMETRIC ANALYSIS 2024年第8期34卷 1-26页

作者： Zhang, Keyang Zhu, Shengfeng Li, Jiajie Yan, Wenjing East China Normal Univ Sch Math Sci Shanghai 200241 Peoples R China East China Normal Univ Key Lab MEA Minist Educ Shanghai 200241 Peoples R China East China Normal Univ Shanghai Key Lab PMMP Shanghai 200241 Peoples R China Shanghai Jiao Tong Univ Sch Math Sci Shanghai 200240 Peoples R China Xi An Jiao Tong Univ Sch Math & Stat Xian 710049 Shaanxi Peoples R China

We consider numerical shape optimization of a fluid-structure interaction model. The constrained system involves multiscale coupling of a two-dimensional unsteady Navier-Stokes equation and a one-dimensional ordinary differential equation for fluid flows and structure, respectively. We derive shape gradients for both objective functionals of least-squares type and energy dissipation. The state and adjoint state equations are numerically solved on the time-dependent domains using the Arbitrary-Lagrangian-Eulerian method. Numerical results are presented to illustrate effectiveness of algorithms.

关键词： Shape optimization fluid-structure interaction Finite element method Shape gradient

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A parametric study regarding structural design of a bioprosthetic aortic valve by 3D fluid-structure interaction simulations

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HELIYON 2024年第6期10卷 e27310页

作者： Kim, Yongwoo Pyo, Won Kyung Kim, Wan Kee Suh, Ga-Young Kang, Keonwook Lee, Seung Hyun Yonsei Univ Dept Mech Engn Seoul South Korea Yonsei Univ Severance Hosp Coll Med Dept Thorac Cardiovasc Surg Seoul South Korea Yonsei Univ Yongin Severance Hosp Coll Med Dept Thorac & Cariovasc Surg Yongin Gyeonggi Do South Korea Calif State Univ Long Beach Dept Biomed Engn Long Beach CA 90840 USA

Since the introduction of transcatheter aortic valve (AV) implantation as a viable option, surgical bioprosthetic AVs have recently started incorporating shorter struts considering future valve -invalve procedures. However, the effect of leaflet coaptation geometry on the longevity of these valves remains unexplored. To address this gap, we performed a finite element analysis on bioprosthetic AVs with varying strut heights using a two-way fluid-structure interaction method. To establish a baseline, we used a standard height based on a rendered platform image of the CE PERIMOUNT Magna Ease valve from Edward Lifesciences in Irvine, CA. Bovine pericardium properties were assigned to the leaflets, while normal saline properties were used as the recirculating fluid in hemodynamic simulations. The physiological pressure profile of the cardiac cycle was applied between the aorta and left ventricle. We calculated blood flow velocity, effective orifice area (EOA), and mechanical stress on the leaflets. The results reveal that as the strut height increases, the stroke volume increases, leakage volume decreases, and EOA improves. Additionally, the maximum mechanical stress experienced by the leaflet decreases by 62% as the strut height increases to 1.2 times the standard height. This research highlights that a low-strut design in bioprosthetic AVs may negatively affect their durability, which can be useful in design of nextgeneration bioprosthetic AVs.

关键词： Aortic valve fluid-structure interaction Hemodynamics Biomechanics

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