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Enhancing heat transfer in L-shaped enclosures with combined natural convection-fluid structure interaction: Incorporating flexible fin and elastic wall

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NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 2024年

作者： Ahmed, Ahmed Qasim Razavi, Seyed Esmail Univ Tabriz Dept Mech Engn Tabriz *** Iran

In the present investigation, a numerical investigation of the flow and heat transfer characteristics inside an L-shaped enclosure with a flexible fin and an elastic wall has been carried out using the finite element method. The fluid-structure interaction model is used to capture the interaction between the fluid and the solid structure. The free end of the flexible fin is exposed to sinusoidal vertical force and the upper wall of the enclosure is considered to be elastic and a sinusoidal force is applied on this elastic wall. The obtained results showed that the fluid flow through the enclosure is entirely influenced by the periodic oscillation of the flexible fin and elastic wall. Besides, the Nusselt number over the horizontal and vertical hot walls of the L-shaped enclosure is strongly affected by the amplitude and frequency of the applied sinusoidal forces on the flexible fin and elastic wall. The heat transfer over the vertical hot wall is enhanced considerably with an increase in the amplitude and frequency of the applied sinusoidal forces. Moreover, the Nusselt number over the hot vertical wall is increased with the decrease of the elastic modulus value of the elastic wall. The results also show that the combination of the flexible fin and elastic wall has contributed to the extra enhancement of the Nusselt number over the hot vertical wall of the L-shaped enclosure.

关键词： Elastic wall enclosure fin flexible fluid-structure interaction natural convection

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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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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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Numerical and experimental fluid-structure interaction analysis of a flexible propeller

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SHIP TECHNOLOGY RESEARCH 2023年第3期70卷 163-173页

作者： Fuentes, D. Hochbaum, A. Cura Schulze, R. Tech Univ Berlin Dynam Maritime Syst DMS Dept Muller Breslau Str 15 D-10623 Berlin Germany

The increasing interest in using flexible materials to design marine propellers, considering deformations due to flow loads. A numerical procedure for analysing two-way fluid-structure interactions, based on the commercial STAR-CCM+ multiphysics software, is described and applied to predict the hydroelastic response of the flexible marine propeller P1790 to hydrodynamic forces in open water conditions. The influence of the deformation on the performance of the flexible propeller was analysed by comparison with its rigid counterpart. The procedure has been validated by means of experiments performed in the cavitation tunnel K27 of the Technical University Berlin with both, the flexible and the rigid propeller. The predicted performance coefficients and the axial deformation of the blades agree well with measured values. This suggests the feasibility of using the passive bending and twisting behaviour of a flexible propeller to adapt the pressure distribution on the blade to improve the propeller performance over a range of advance ratios.

关键词： fluid-structure interaction hydroelastic response flexible propellers open water test Reynolds-averaged Navier-Stokes Computational fluid Dynamics Experimental measurements Finite Element Method

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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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On a fluid-structure interaction problem for plaque growth

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NONLINEARITY 2023年第1期36卷 537-583页

作者： Abels, Helmut Liu, Yadong Univ Regensburg Fak Math D-93053 Regensburg Germany

We study a free-boundary fluid-structure interaction problem with growth, which arises from the plaque formation in blood vessels. The fluid is described by the incompressible Navier-Stokes equations, while the structure is considered as a viscoelastic incompressible neo-Hookean material. Moreover, the growth due to the biochemical process is taken into account. Applying the maximal regularity theory to a linearization of the equations, along with a deformation mapping, we prove the well-posedness of the full nonlinear problem via the contraction mapping principle.

关键词： fluid-structure interaction two-phase flow growth free boundary value problem maximal regularity Primary Secondary

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SEMI-IMPLICIT EULERIAN METHOD FOR THE fluid structure interaction OF ELASTIC MEMBRANES

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SIAM JOURNAL ON SCIENTIFIC COMPUTING 2025年第3期47卷 A1555-A1578页

作者： Ciallella, Mirco Milcent, Thomas Univ Paris Cite Lab Jacques Louis Lions Paris France Ecole Natl Super Arts & Metiers Inst Mecan & Ingn F-33400 Talence France

In this paper we propose a novel and general approach to design semi-implicit methods for the simulation of fluid-structure interaction problems in a fully Eulerian framework. Herein, we focus on the two-dimensional version of the general model of full membrane elasticity consists in treating the elastic source term by writing an evolution equation on the structure stress tensor, even if it is nonlinear. Then, the semi-implicit treatment allows us to add to the linear system, arising from the discretization of the fluid-structure problem, some consistent dissipation terms that depend on the local deformation and stiffness of the membrane and stabilize the method. Due to the linearly implicit discretization, the approach does not need iterative solvers and can be easily applied to any Eulerian framework for fluid-structure interaction. Its stability properties are studied by performing a Von Neumann analysis on a simplified one-dimensional model and proving that, thanks to the additional dissipation, the discretized coupled system is unconditionally stable. Several numerical experiments are shown for two-dimensional problems by comparing the new method to the original explicit scheme and studying the effect of structure stiffness and mesh refinement on the membrane dynamics. The newly designed scheme is able to relax the time step restrictions that affect the explicit method and reduce crucially the computational costs, especially when very stiff membranes are under consideration.

关键词： Eulerian elasticity fluid-structure interaction semi-implicit immersed boundary incompressible Navier--Stokes

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