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Global OCEANS Singapore - U.S. Gulf Coast Conference

作者： Dang, Zhigao Mao, Zhaoyong Song, Baowei Tian, Wenlong Northwestern Polytech Univ Sch Marine Sci & Technol Xian Peoples R China

ISBN: (纸本)9781728154466

Flow past a circular cylinder is a classical topic in ocean engineering application, such as the marine riser, oil pipeline, etc. When the ocean current flows around cylinder structures, shedding vortices will appear alternately in the wake of the cylinder at a certain Reynolds number, which is harmful to the service life of ocean engineering structures. Among the abundant active and passive methods of flow control, the splitter plate behind the circular cylinder is a popular choice to improve the flow field of the circular cylinder. It should be noted that the motions of the splitter plate are neglected because most of the present studies treat the splitter plate as rigid body. Therefore, the fluid-structure interaction (FSI) effect between the fluid and the splitter plate is taken into account in the present study. What's more, a new idea with bidirectional splitter plates are proposed to improve the flow field with beneficial effects. Correspondingly, the relationships between the ratios of RMS lift and mean drag coefficients by original circular cylinder with different configurations of the splitter plate are given.

关键词： circular cylinder fluid-structure interaction splitter plate lift drag

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An immersed multi-material arbitrary Lagrangian-Eulerian finite element method for fluid-structure-interaction problems

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2024年 432卷

作者： Sun, Zixian Zeng, Zhixin Li, Jiasheng Zhang, Xiong Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China

fluid-structure-interaction (FSI) phenomena are widely concerned in engineering practice and challenge current numerical methods. In this article, the finite element method is strongly coupled with the multi-material arbitrary Lagrangian-Eulerian (MMALE) method to develop a monolithic FSI method named the immersed multi-material arbitrary Lagrangian-Eulerian finite element method (IALEFEM). By immersing the finite elements in the MMALE computational grid, the fluid-solid interface is directly tracked by the element boundary with accurate normal directions. The fluid-structure-interaction is implicitly implemented by assembling the nodal variables and updating the Lagrangian momentum equation on the MMALE grid. Combining the advantages of both MMALE and FEM with the immersed boundary method, the IALEFEM is effective for solving complicated FSI problems with multi-material fluid flow. A slip fluid-structure-interaction method is also proposed to enhance the computational accuracy in simulating FSI problems with significantly different velocity fields. The accuracy and effectiveness of the IALEFEM are verified and validated by several benchmark numerical examples including the shock-cylinder obstacle interaction, flexible panel deformation induced by shock wave, dam break problem with large structural deformation, water entry of a wedge, fragmentation of a cylinder shell induced by blast, response of elastic plate subjected to spherical near-field explosion and structural damage of open-frame building under blast loading.

关键词： Multi-material arbitrary Lagrangian Eulerian method Finite element method Immersed boundary method fluid-structure interaction

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Efficient two-way fluid - structure interaction simulation for performance prediction of pressure-compensating emitter

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BIOSYSTEMS ENGINEERING 2024年 244卷 53-66页

作者： Seo, Byung-hun Lee, Sangik Lee, Jong-hyuk Kim, Dong-su Seo, Ye-jin Kim, Dong-woo Choi, Won Seoul Natl Univ Coll Agr & Life Sci Dept Landscape Architecture & Rural Syst Engn 1 Gwanak Ro Seoul 08826 South Korea Kyungpook Natl Univ Coll Agr & Life Sci Dept Agr Civil Engn 80 Daehak Ro Daegu 41566 South Korea Seoul Natl Univ Integrated Major Global Smart Farm 1 Gwanak Ro Seoul 08826 South Korea Seoul Natl Univ Res Inst Agr & Life Sci 1 Gwanak Ro Seoul 08826 South Korea

Drip irrigation using a high -performance pressure-compensating (PC) emitter is one of the essential components for precision agriculture, and it is necessary to accurately predict its performance prior to design. In this study, an efficient two-way fluid -structure interaction (FSI) simulation model was developed and verified through an enlarged model experiment. The computational fluid dynamics (CFD) and computational solid mechanics (CSM) models of the FSI simulation were systematically verified, and a calibration method for the overestimated flow rate in the re-rising range was applied. The CFD model was determined to be the shear stress transport turbulence model, and the CSM model was determined to be the Ogden hyperelastic model for the PC emitter. The minimum prediction error for the flow rate was 7.93%, which was within 10% for all cases. The simulation model demonstrated its efficiency by analysing the performance of a single PC emitter with an average total analysis time of 18.6 h. In addition, by comparing various cases according to the design parameters, it is considered that the hardness of the diaphragm has a significant impact on the design of low-pressure PC emitters. The simulation model of this study can accurately predict the performance of PC emitter under specific conditions, yet improvement of simulation model is required to be applied in design optimisation. Future studies may benefit from combining an improved FSI simulation with a surrogate model to further enhance optimisation efforts.

关键词： Drip irrigation fluid-structure interaction Similarity law Performance prediction Pressure-compensating emitter Multiphysics simulation

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Optimization-based model order reduction of fluid-structure interaction problems

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JOURNAL OF COMPUTATIONAL PHYSICS 2025年 536卷

作者： Taddei, Tommaso Xu, Xuejun Zhang, Lei Univ Bordeaux IMB UMR 5251 F-33400 Talence France Inria Bordeaux Sud Ouest Team MEMPHIS F-33400 Talence France Tongji Univ Sch Math Sci Key Lab Intelligent Comp & Applicat Minist Educ Shanghai 200092 Peoples R China Chinese Acad Sci AMSS Inst Computat Math Beijing 100190 Peoples R China

We introduce optimization-based full-order and reduced-order formulations of fluid-structure interaction problems. We study the flow of an incompressible Newtonian fluid which interacts with an elastic body: we consider an arbitrary Lagrangian Eulerian formulation of the fluid problem and a fully Lagrangian formulation of the solid problem;we rely on a finite element discretization of both fluid and solid equations. The distinctive feature of our approach is an implicit coupling of fluid and structural problems that relies on the solution to a constrained optimization problem with equality constraints. We discuss the application of projection-based model reduction to both fluid and solid subproblems: we rely on Galerkin projection for the solid equations and on least-squares Petrov-Galerkin projection for the fluid equations. Numerical results for three model problems illustrate the many features of the formulation.

关键词： Model order reduction fluid-structure interaction Partitioned method Optimization-based method

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A stable loosely coupled fluid structure interaction scheme using sharp interface immersed boundary method for low to moderate mass ratios

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COMPUTERS & fluidS 2024年 280卷

作者： Sarkar, Nandan Dawn, Sayantan Raj, Apurva Khan, Piru Mohan Roy, Somnath Indian Inst Technol Kharagpur Dept Mech Engn Kharagpur 721302 West Bengal India Indian Inst Technol Kharagpur Dept Aerosp Engn Kharagpur 721302 West Bengal India Indian Inst Technol Kharagpur Ctr Computat & Data Sci Kharagpur 721302 West Bengal India

The stability of fluid-structure interaction (FSI) problems using immersed boundary (IB) method is an active area of research. In this regime, strong coupling is generally used to ensure stability and robustness. Strong coupling, however, is computationally expensive owing to its iterative nature. In the present work, we showcase the application of loose coupling algorithm for FSI problems using the sharp interface IB method specifically for low to moderate mass ratios (defined as the ratio of the mass of the structure to the mass of the fluid at the same volume). We demonstrate several test cases: vortex-induced vibration (VIV) of a cylinder, the effect of hinged leaflets attached to the exit of a piston in a channel, sedimentation of a circular disk, and bi-leaflet mechanical heart valves (BMHV) made of lightweight materials in physiological flow. We found our loose coupling method to be stable in all the test cases and obtained a linear relationship between the grid resolution employed and the lowest mass ratio for stable computations in the case of VIV of cylinder. Thus, a significant finding of our work is that with a reduction in grid spacing, one can achieve stable FSI simulation involving lower mass ratios using loosly-coupled schemes. We have deployed the present technique to investigate the dynamics of very low-density cylinders and hinged leaflets due to the fluid forces on them. The current method is extended to handle flexible bodies, such as vortex-induced vibrations of an elastic plate attached to a rigid cylinder and stable simulations are obtained when the Young's modulus of the elastic plate is varied.

关键词： fluid-structure interaction Immersed boundary method Loose coupling

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Study of Typical Ruptured and Unruptured Intracranial Aneurysms Based on fluid-structure interaction

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WORLD NEUROSURGERY 2023年 175卷 E115-E128页

作者： Gao, Bei Ding, Hongchang Ren, Yande Bai, Di Wu, Zeyu Shandong Univ Sci & Technol Coll Mech & Elect Engn Qingdao Peoples R China Qingdao Univ Affiliated Hosp Qingdao Peoples R China

-BACKGROUND: Most intracranial aneurysms (IAs) will be abnormal bulges on the walls of intracranial arteries that result from the dynamic interaction of geometric morphology, hemodynamics, and pathophysiology. Hemodynamics plays a key role in the origin, development, and rupture of IAs. In the past, hemodynamic studies of IAs were mostly based on the rigid wall hypothesis of computational fluid dynamics, and the influence of arterial wall deformation was ignored. We used fluid -structure interaction (FSI) to study the features of ruptured aneurysms, because it can solve this problem very well and the simulation will be more realistic.-METHODS: A total of 12 IAs, 8 ruptured and 4 unruptured, at the middle cerebral artery bifurcation were studied using FSI to better identify the characteristics of ruptured IAs. We studied the differences in the hemodynamic parameters, including the flow pattern, wall shear stress (WSS), oscillatory shear index (OSI), and displacement and deformation of the arterial wall.-RESULTS: Ruptured IAs had a larger low WSS area and more complex, concentrated, and unstable flow. Also, the OSI was higher. In addition, the displacement deformation area at the ruptured IA was more concentrated and larger.-CONCLUSIONS: A large aspect ratio;a large height/ width ratio;complex, unstable, and concentrated flow patterns with small impact areas;a large low WSS region;large WSS fluctuation, high OSI;and large displacement of the aneurysm dome could be risk factors associated with aneurysm rupture. If similar cases are encountered when simulation is used in the clinic, priority should be given to diagnosis and treatment.

关键词： Displacement deformation fluid-structure interaction Intracranial aneurysm Wall shear stress

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DRLinSPH: an open-source platform using deep reinforcement learning and SPHinXsys for fluid-structure-interaction problems

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ENGINEERING APPLICATIONS OF COMPUTATIONAL fluid MECHANICS 2025年第1期19卷

作者： Ye, Mai Ma, Hao Ren, Yaru Zhang, Chi Haidn, Oskar J. Hu, Xiangyu Tech Univ Munich TUM Sch Engn & Design D-85748 Garching Germany Zhengzhou Univ Aeronaut Sch Aerosp Engn Zhengzhou Peoples R China Sichuan Univ State Key Lab Hydraul & Mt River Engn Chengdu Peoples R China Huawei Technol Munich Res Ctr Munich Germany

fluid-structure interaction (FSI) problems are characterized by strong nonlinearities arising from complex interactions between fluids and structures. These pose significant challenges for traditional control strategies in optimizing structural motion, often leading to suboptimal performance. In contrast, deep reinforcement learning (DRL), through agent interactions within numerical simulation environments and the approximation of control policies using deep neural networks (DNNs), has shown considerable promise in addressing high-dimensional FSI problems. Furthermore, the training of DRL models necessitates a stable numerical environment, particularly for FSI problems. Smoothed particle hydrodynamics (SPH) offers a flexible and efficient computational approach for modeling large deformations, fractures, and complex interface movements inherent in FSI, outperforming traditional grid-based methods. This work presents DRLinSPH, an open-source Python platform that integrates the SPH-based numerical environment provided by the open-source software SPHinXsys with the mature DRL platform Tianshou to enable parallel training for FSI problems. DRLinSPH has been successfully applied to four FSI scenarios: sloshing suppression using rigid and elastic baffles by controlling displacement or introducing deformation, achieving a maximum wave height reduction of 68.81% and 42.92%, respectively;wave energy harvesting optimization with an 8.25% improvement through an oscillating wave surge converter (OWSC) by regulating the damping characteristics of the Power Take-Off (PTO) system;and muscle-driven fish swimming control in a straight line within vortices. The results demonstrate the platform's accuracy, stability, and scalability, highlighting its potential to advance industrial solutions for complex FSI challenges.

关键词： Smoothed particle hydrodynamics fluid-structure interaction deep reinforcement learning sloshing suppression oscillating wave surge converter fish swimming

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fluid structure interaction analysis for rupture risk assessment in patients with middle cerebral artery aneurysms

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SCIENTIFIC REPORTS 2025年第1期15卷 1-14页

作者： Nagy, Jozsef Fenz, Wolfgang Thumfart, Stefan Maier, Julia Major, Zoltan Stefanits, Harald Gollwitzer, Maria Oberndorfer, Johannes Stroh, Nico Giretzlehner, Michael Sonnberger, Michael Gruber, Andreas Rauch, Philip-Rudolf Gmeiner, Matthias Eulerian Solut eU Leonfeldnerstr 245 Linz Austria RISC Software GmbH Unit Med Informat Softwarepk 32a Hagenberg Austria Johannes Kepler Univ Linz Inst Polymer Prod Engn Altenberger Str 69 Linz Austria Kepler Univ Hosp Dept Neurosurg Wagner Jauregg Weg 15 A-4020 Linz Austria Johannes Kepler Univ Linz Altenbergerstr 69 A-4040 Linz Austria Johannes Kepler Univ Linz Kepler Univ Hosp Inst Neuroradiol Linz Austria Johannes Kepler Univ Linz Clin Res Inst Neurosci Fac Med Wagner Jauregg Weg 15 A-4020 Linz Austria

Accurate rupture risk assessment is essential for optimizing treatment decisions in patients with cerebral aneurysms. While computational fluid dynamics (CFD) has provided critical insights into aneurysmal hemodynamics, most analyses focus on blood flow patterns, neglecting the biomechanical properties of the aneurysm wall. To address this limitation, we applied fluid-structure interaction (FSI) analysis, an integrative approach that simulates the dynamic interplay between hemodynamics and wall mechanics, offering a more comprehensive risk assessment. In this study, we used advanced FSI techniques to investigate the rupture risk of middle cerebral artery bifurcation (MCA) aneurysms, analyzing a cohort of 125 patients treated for a MCA aneurysm at Kepler University Hospital, Linz, Austria. Multivariate analysis identified two significant rupture predictors: High Equivalent Stress Area (HESA;p = 0.049), which quantifies stress distribution relative to the aneurysm surface, and Gaussian curvature (GLN;p = 0.031), which captures geometric complexity. We also introduce the HGD index, a novel composite metric combining HESA, GLN, and Maximum Wall Displacement, designed to enhance predictive accuracy. With a threshold of 0.075, the HGD index exhibited excellent diagnostic performance;in internal validation, 24 of 25 ruptured aneurysms surpassed this threshold, yielding a sensitivity of 0.96. In a 5-fold cross validation the reliability of results was confirmed. Our findings demonstrate that the HGD index provides superior rupture risk stratification compared to conventional single-parameter models, offering a more robust tool for the assessment of complex aneurysmal structures. Further multicenter studies are warranted to refine and validate the HGD index, advancing its potential for clinical application and improving patient outcomes.

关键词： Cerebral aneurysm Middle Cerebral Artery Rupture risk fluid-structure interaction

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Analysis of fluid-structure interaction in a directional permeability membrane in pressure-driven flow

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ENGINEERING RESEARCH EXPRESS 2023年第1期5卷 015020-015020页

作者： Bayat, Hamid Krueger, Paul S. Willis, David A. Southern Methodist Univ Bobby B Lyle Sch Engn Dept Mech Engn Dallas TX 75275 USA

Finite volume and finite element analysis of fluid-structure interaction is performed to understand the behavior of a directional permeability membrane in pressure-driven flow. The membrane is comprised of two flexible porous sheets separated by a spacer. The porous sheets each have a different thickness with pores that are offset from each other. The design allows flow when the thicker sheet is on the high pressure side, but prevents flow if the pressure gradient is reversed. Flow through the membrane is studied for a pressure range of 0.01-0.1 m H2O in forward flow to understand the complex fluid motion and dependence of membrane deformation on sheet thickness, downstream pore diameter, and initial gap between the sheets. In forward flow, maximum mass flow rate of 0.2 g s(-1) (or flow rate of 12.024 ml min(-1)) can be obtained at 0.1 m H2O pressure head. Reverse flow conditions are modeled to study the effect of design parameters on the required closing pressure, indicating that as little as 0.0325 m H2O of pressure head is required for closing.

关键词： permeable membrane directional membrane flexible membrane microcheck valve porous membrane fluid-structure interaction

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fluid-structure interaction analysis of hemodynamics in different degrees of stenoses considering microcirculation function

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ADVANCES IN MECHANICAL ENGINEERING 2021年第1期13卷

作者： He, Fan Hua, Lu Guo, Tingting Beijing Univ Civil Engn & Architecture Sch Sci Dept Mech 1 Zhanlanguan Rd Beijing 100044 Peoples R China Chinese Acad Med Sci & Peking Union Med Coll Natl Ctr Cardiovasc Dis Natl Clin Res Ctr Cardiovasc Dis Thrombosis CtrFuwai HospState Key Lab Cardiovas 167 Beilishi Rd Beijing 100037 Peoples R China

In developed countries, stenosis is the main cause of death. To investigate hemodynamics within different degrees of stenoses, a stenosis model incorporating fluid-structure interaction and microcirculation function is used in this paper. Microcirculation is treated as a seepage outlet boundary condition. Compliant arterial wall is considered. Numerical simulation based on fluid-structure interaction is performed using finite element method. Our results indicate that (i) the increasing degree of stenosis makes the pressure drop increase, and (ii) the wall shear stress and the velocity in the artery zone may be more sensitive than the pressure with the increase of percentage stenosis, and (iii) there are higher wall shear stress and flow velocity in the post-stenosis region of severer stenosis. This work contributes to understand hemodynamics for different degrees of stenoses and it provides detailed information for stenosis and microcirculation function.

关键词： Artery stenosis hemodynamics microcirculation fluid-structure interaction

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