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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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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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A patient-specific fluid-structure interaction model of the cerebrovascular damage in relation to traumatic brain injury

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TRAUMA-ENGLAND 2021年第1期23卷 33-43页

作者： Razaghi, Reza Biglari, Hasan Karimi, Alireza Univ Tabriz Dept Mech Engn Tabriz 51666 Iran Kyushu Univ Dept Mech Engn Fukuoka Japan

Background There is a lack of knowledge on the magnitudes of the biomechanical stresses and deformations occurring in the cerebral arterial wall after traumatic brain injury (TBI). Experimental techniques are unable to calculate the stresses and deformations in the cerebral arterial wall after TBI;therefore, the application of numerical simulations, such as finite element modeling, is preferred. Methods This study was aimed to calculate the stresses and deformations as well as the alteration in the pressure and velocity of the blood in the cerebrovascular artery using a fluid-structure interaction model. Results The results revealed considerable increase in the pressure and velocity of the blood which might lead to cerebrovascular damage followed by hemorrhage. The arterial wall showed the highest deformation of 0.047 mm in the X direction which was higher than that in the Y (0.035-0.050 mm) and Z (0.019-0.030 mm) directions. Conclusions These results have implications not only for the understanding of the stresses and deformations in the cerebral artery because of TBI, but also for providing a comprehensive knowledge for biomechanical and medical experts in regard to thresholds of cerebrovascular damage for use in establishing preventive and/or treatment methods.

关键词： Cerebrovascular artery arterial damage traumatic brain injury stress and deformation fluid-structure interaction

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fluid-poroviscoelastic structure interaction problem with nonlinear geometric coupling

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JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES 2024年 188卷 345-445页

作者： Kuan, Jeffrey Canic, Suncica Muha, Boris Univ Maryland Dept Math College Pk MD USA Univ Calif Berkeley Dept Math Berkeley CA 94720 USA Univ Zagreb Fac Sci Dept Math Zagreb Croatia

We investigate weak solutions to a fluid-structure interaction (FSI) problem between the flow of an incompressible, viscous fluid modeled by the Navier-Stokes equations, and a poroviscoelastic medium modeled by the Biot equations. These systems are coupled nonlinearly across an interface with mass and elastic energy, modeled by a reticular plate equation, which is transparent to fluid flow. We provide a constructive proof of the existence of a weak solution to a regularized problem. Next, a weakclassical consistency result is obtained, showing that the weak solution to the regularized problem converges, as the regularization parameter approaches zero, to a classical solution to the original problem, when such a classical solution exists. While the assumptions in the first step only require the Biot medium to be poroelastic, the second step requires additional regularity, namely, that the Biot medium is poroviscoelastic. This is the first weak solution existence result for an FSI problem with nonlinear coupling involving a Biot model for poro(visco)elastic media. (c) 2024 The Author(s). Published by Elsevier Masson SAS. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/).

关键词： fluid-structure interaction Poroelastic media Nonlinear coupling Well-posedness

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The existence of a weak solution for a compressible multicomponent fluid structure interaction problem

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JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES 2024年 184卷 118-189页

作者： Kalousek, Martin Mitra, Sourav Necasova, Sarka Czech Acad Sci Inst Math Zitna 25 Prague 11567 Czech Republic IIT Indore Khandwa Rd Indore 453552 MP India

We analyze a system of PDEs governing the interaction between two compressible mutually noninteracting fluids and a shell of Koiter type encompassing a time dependent 3D domain filled by the fluids. The dynamics of the fluids is modeled by a system resembling compressible Navier-Stokes equations with a physically realistic pressure depending on densities of both the fluids. The shell possesses a non-linear, non-convex Koiter energy. Considering that the densities are comparable initially we prove the existence of a weak solution until the degeneracy of the energy or the self-intersection of the structure occurs for two cases. In the first case the adiabatic exponents are assumed to satisfy max{gamma, beta} > 2, min{gamma, beta} > 0, and the structure involved is assumed to be non-dissipative. For the second case we assume the critical case max{gamma, beta} >= 2 and min{gamma, beta} > 0 and the dissipativity of the structure. The result is achieved in several steps involving, extension of the physical domain, penalization of the interface condition, artificial regularization of the shell energy and the pressure, the almost compactness argument, added structural dissipation and suitable limit passages depending on uniform estimates. (c) 2024 Elsevier Masson SAS. All rights reserved.

关键词： fluid-structure interaction Two-fluid model Global weak solutions

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An isogeometric b-rep mortar-based mapping method for non-matching grids in fluid-structure interaction

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ADVANCED MODELING AND SIMULATION IN ENGINEERING SCIENCES 2021年第1期8卷 1-55页

作者： Apostolatos, Andreas Emiroglu, Altug Shayegan, Shahrokh Pean, Fabien Bletzinger, Kai-Uwe Wuechner, Roland Tech Univ Munich Chair Struct Anal Arcisstr 21 D-80333 Munich Germany Swiss Fed Inst Technol Zurich Comp Vis Lab Sternwartstr 7 CH-8092 Zurich Switzerland

In this study the isogeometric B-Rep mortar-based mapping method for geometry models stemming directly from Computer-Aided Design (CAD) is systematically augmented and applied to partitioned fluid-structure interaction (FSI) simulations. Thus, the newly proposed methodology is applied to geometries described by their Boundary Representation (B-Rep) in terms of trimmed multipatch Non-Uniform Rational B-Spline (NURBS) discretizations as standard in modern CAD. The proposed isogeometric B-Rep mortar-based mapping method is herein extended for the transformation of fields between a B-Rep model and a low order discrete surface representation of the geometry which typically results when the Finite Volume Method (FVM) or the Finite Element Method (FEM) are employed. This enables the transformation of such fields as tractions and displacements along the FSI interface when Isogeometric B-Rep Analysis (IBRA) is used for the structural discretization and the FVM is used for the fluid discretization. The latter allows for diverse discretization schemes between the structural and the fluid Boundary Value Problem (BVP), taking into consideration the special properties of each BVP separately while the constraints along the FSI interface are satisfied in an iterative manner within partitioned FSI. The proposed methodology can be exploited in FSI problems with an IBRA structural discretization or to FSI problems with a standard FEM structural discretization in the frame of the Exact Coupling Layer (ECL) where the interface fields are smoothed using the underlying B-Rep parametrization, thus taking advantage of the smoothness that the NURBS basis functions offer. All new developments are systematically investigated and demonstrated by FSI problems with lightweight structures whereby the underlying geometric parametrizations are directly taken from real-world CAD models, thus extending IBRA into coupled problems of the FSI type.

关键词： Mortar-based mapping Isogeometric B-Rep analysis Trimmed NURBS multipatches Exact coupling layer Penalty method fluid-structure interaction

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EXPERIMENTAL INVESTIGATION OF fluid-structure interaction IN LINKED FLEXIBLE NET CAGES 40

EXPERIMENTAL INVESTIGATION OF FLUID-STRUCTURE INTERACTION IN...

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40th ASME International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Dong, Shuchuang Zhou, Jinxin Li, Qiao Yoshida, Takero Kitazawa, Daisuke Univ Tokyo Inst Ind Sci Kashiwa Chiba Japan

ISBN: (纸本)9780791885154

In the present study, three flexible net cage groups (a single net cage, two net cages arrayed in one column, and three net cages arrayed in one column) were investigated in a flume tank, in order to analyze the hydrodynamic characteristics of the flow and linked flexible net cage, such as the drag force, cage deformation, and flow field inside and around. Based on these results, the fluid-structure interactions of the flexible net cage were discussed. The drag forces and cage deformation of a single flexible net cage were first studied, and their relationships to the current speed were found consistent with existing literature. The averaged current speed inside the single net cage was 0.72 for all incoming current speeds. Furthermore, significant current speed reductions occurred behind the single net cage, at the downstream, for all incoming current speeds. Within the measurement range, the current speed reduction area downstream from the single net cage was almost as wide as the cage diameter, and the length was up to 1.4 times cage diameters along the incoming current direction. The location of this area gradually approached the water surface as the current speed increased. In the case of two flexible net cages arrayed in one column, the differences in drag force occurred when the distance between the two cages was changed. In addition, the current speed incident on the downstream cage tended to decrease, as the distance between the cages increased. The averaged current speeds incident on the downstream cage were 0.54, 0.44, 0.77, and 0.40 when the distances between two cages were 30.0 cm, 60.0 cm, and 90.0 cm, respectively. In the case of three flexible net cages arrayed in one column, the total drag force of three flexible net cages was 2.2 times that of a single net cage. On the other hand, at the maximum current speed of 50 cm/s, the cross-sectional areas of the first net cage, the second net cage, and the third net cage were 177.10 cm(2), 274.19 cm(2), and

关键词： Flume tank experiments fluid-structure interaction Flexible net cage Linked net cages

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