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Design and Optimization of a New Anti-reflux Biliary Stent With Retractable Bionic Valve Based on fluid-structure interaction Analysis

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FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY 2022年 10卷 824207页

作者： Su, Yushan Xiang, Zhongxia Song, Xiaofei Zheng, Shuxian Xu, Xinsheng Tianjin Univ Key Lab Mech Theory & Equipment Design Minist Educ Tianjin Peoples R China Nankai Hosp Tianjin Peoples R China

Duodenal biliary reflux has been a challenging common problem which could cause dreadful complications after biliary stent implantation. A novel anti-reflux biliary stent with a retractable bionic valve was proposed according to the concertina motion characteristics of annelids. A 2D equivalent fluid-structure interaction (FSI) model based on the axial section was established to analyze and evaluate the mechanical performances of the anti-reflux biliary stent. Based on this model, four key parameters (initial shear modulus of material, thickness, pitch, and width) were selected to investigate the influence of design parameters on anti-reflux performance via an orthogonal design to optimize the stent. The results of FSI analysis showed that the retrograde closure ratio of the retractable valve primarily depended on initial shear modulus of material (p < 0.05) but not mainly depended on the thickness, pitch, and width of the valve (p > 0.05). The optimal structure of the valve was finally proposed with a high retrograde closing ratio of 95.89%. The finite element model revealed that the optimized anti-reflux stent possessed improved radial mechanical performance and nearly equal flexibility compared with the ordinary stent without a valve. Both the FSI model and experimental measurement indicated that the newly designed stent had superior anti-reflux performance, effectively preventing the duodenobiliary reflux while enabling the bile to pass smoothly. In addition, the developed 2D equivalent FSI model provides tremendous significance for resolving the fluid-structure coupled problem of evolution solid with large deformation and markedly shortens the calculation time.

关键词： anti-reflux biliary stent bionic valve fluid-structure interaction optimization

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A Lagrangian fluid-structure interaction approach for the simulation of airbag deployment

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FINITE ELEMENTS IN ANALYSIS AND DESIGN 2022年 198卷

作者： Meduri, Simone Cremonesi, Massimiliano Frangi, Attilio Perego, Umberto Politecn Milan Dept Civil & Environm Engn Piazza Leonardo Vinci 32 Milan Italy

The numerical simulation of airbags is receiving an increasing attention for the remarkable advantages in terms of cost, efficiency, flexibility and amount of data that can be extracted from the analysis. This work proposes an advanced fluid-structure interaction (FSI) numerical technique for the simulation of airbag deployment. The fluid subproblem, described by weakly compressible Navier-Stokes equations, is solved exploiting the advanced features of the Particle Finite Element Method (PFEM) while the solid subproblem is addressed using standard Finite Element method. A domain decomposition approach with a special treatment of the fluid-structure interface conditions has been implemented to couple fluid and structural solvers allowing for non-conforming meshes at the interface and different time step size in the two subdomains. A peculiar feature of the proposed methodology is the explicit time integration, mandatory for the solution of very fast dynamics problems, like the airbag deployment: an explicit fluid solver is coupled explicitly with an explicit structural solver. The proposed technique is first tested on a inflation of a balloon, showing very good agreements and then it has been applied to the real case of airbag deployment.

关键词： Airbag simulation fluid-structure interaction PFEM Lagrangian approach

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Development of a coupling algorithm for fluid-structure interaction analysis of submerged aquaculture nets

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OCEAN ENGINEERING 2022年 243卷

作者： Cheng, Hui Ong, Muk Chen Li, Lin Chen, Hao Univ Stavanger Dept Mech & Struct Engn & Mat Sci N-4036 Stavanger Norway Univ Glasgow Sch Engn Glasgow Lanark Scotland

A coupling algorithm between two open-source numerical toolboxes, i.e., OpenFOAM and Code_Aster, is implemented for fluid-structure interaction analysis of submerged nets. This algorithm is developed to handle the wake effects of thin, flexible and highly permeable structures with complex geometries. Compared to previous approaches, the present algorithm simplifies the procedures of the model preparation by removing additional data-fitting processes for porous coefficients, and improves the accuracy of structural responses by employing a fluid solver to calculate the flow field and a superior Screen model to calculate the hydrodynamic forces. The coupling algorithm is comprehensively described and validated with published experiments for both fixed and flexible nets. Different solidities, inflow angles, incoming velocities and dimensions of nets are also considered. The comparisons of flow velocity in the wake, deformation of flexible nets and drag force on the full-scale fish cage show that the numerical results obtained from the present coupling algorithm are in good agreement with published experimental data.

关键词： Dynamic porous media model Screen model fluid-structure interaction Finite volume method Finite element method Aquaculture nets

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Fatigue analysis in rotor of a prototype bulb turbine based on fluid-structure interaction

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ENGINEERING FAILURE ANALYSIS 2022年 132卷

作者： Cao, Jingwei Tian, Hong Ahn, Soo-Hwang Duo, Wenzhi Bi, Huili Zhao, Lin Zhao, Guozheng Gao, Haiyu Wang, Mingming Ma, Guoming Wang, Zhengwei Liu, Yan Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China Bingling Hydropower Dev Co Ltd Gansu Power Investment Lanzhou 731600 Gansu Peoples R China

Bulb turbine units are widely used in run-of river or dam projects with relatively low head, and can also be used for tidal energy utilization. Some types of bulb turbines have excessive vibration and fatigue failure problems, which threats their fatigue life. The model analyzed in this paper is a prototype bulb turbine rotor which suffered cracks, probably due to erosion and welding defects. The dynamic stress characteristics are analyzed under not only the non-cracked shaft condition but also the cracked one, to find possible causes of the failure. The computational fluid dynamics (CFD) simulation is performed to obtain reliable hydraulic load on the runner for performing the FEM analysis. The CFD results are verified by comparing with the site test for the prototype one. The linear elastic fracture mechanics theory combined with the fluid-structural interaction theory is applied to developing a cracked FEM model, to obtain the dynamic stress characteristics for the runner, shaft and rotor. The results reveal that the change in dynamic stress level on the shaft flange root significantly depends on the operating conditions Based on the numerical calculations and site inspection, it could be concluded that the insufficient sealing could lead to leakage flows with specific flow rates in flange root, which resulted in the occurrence of erosion;in addition, the welding at the flange root probably generated tiny defects. These two factors are likely lead to fatigue cracks and major failure of the shaft. Suggestions for solutions for the problems of the shaft are also discussed. Results of this study helps to find the reasons of the shaft fatigue failure. Furthermore, the analysis method could be used for an accurate calculation of fatigue life and providing guidance in future designs and operations of bulb turbine units.

关键词： Bulb turbine rotor Fatigue analysis fluid-structure interaction Dynamic stress

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Intelligent Design Optimization System for Additively Manufactured Flow Channels Based on fluid-structure interaction

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MICROMACHINES 2022年第1期13卷 100-100页

作者： Ji, Haonan Zou, Bin Ma, Yongsheng Lange, Carlos F. Liu, Jikai Li, Lei Shandong Univ Sch Mech Engn Ctr Adv Jet Engn Technol CaJET Jinan 250061 Peoples R China Shandong Univ Key Lab High Efficiency & Clean Mech Mfg Minist Educ Jinan 250061 Peoples R China Shandong Univ Natl Demonstrat Ctr Expt Mech Engn Educ Jinan 250061 Peoples R China Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518055 Peoples R China Univ Alberta Dept Mech Engn Edmonton AB T6G 1H9 Canada

Based on expert system theory and fluid-structure interaction (FSI), this paper suggests an intelligent design optimization system to derive the optimal shape of both the fluid and solid domain of flow channels. A parametric modeling scheme of flow channels is developed by design for additive manufacturing (DfAM). By changing design parameters, a series of flow channel models can be obtained. According to the design characteristics, the system can intelligently allocate suitable computational models to compute the flow field of a specific model. The pressure-based normal stress is abstracted from the results and transmitted to the solid region by the fluid-structure (FS) interface to analyze the strength of the structure. The design space is obtained by investigating the simulation results with the metamodeling method, which is further applied for pursuing design objectives under constraints. Finally, the improved design is derived by gradient-based optimization. This system can improve the accuracy of the FSI simulation and the efficiency of the optimization process. The design optimization of a flow channel in a simplified hydraulic manifold is applied as the case study to validate the feasibility of the proposed system.

关键词： expert system fluid-structure interaction design optimization additive manufacturing flow channel

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A hydroelastic fluid-structure interaction solver based on the Riemann-SPH method

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 390卷

作者： Meng, Zi-Fei Zhang, A-Man Yan, Jia-Le Wang, Ping-Ping Khayyer, Abbas Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China Kyoto Univ Dept Civil & Earth Resources Engn Kyoto 6158540 Japan

A hydroelastic fluid-structure interaction (FSI) solver entirely based on the Riemann-SPH method is proposed. In this scheme, the Riemann-SPH method is incorporated to model elastic structures, which is performed by proposing a new treatment on Cauchy stress. The present structure solver can avoid the use of the artificial viscous force and can obtain good results. For the fluid, the conventional Riemann-SPH with a low-dissipation limiter is adopted to simulate incompressible free surface flows. The structure solver is coupled with the fluid solver by a simple coupling way considering the force balance. The developed structure solver is verified by three benchmarks, namely a free oscillating cantilever plate, stress concentration problem of a plate and wave propagation in a cable. Subsequently, through several 2D and 3D typical hydroelastic FSI tests, the accuracy and robustness of the present FSI solver are verified/validated by comparing with analytical solutions and experimental results.(c) 2021 Elsevier B.V. All rights reserved.

关键词： Hydroelasticity fluid-structure interaction Elastic structure Free surface flows Riemann-SPH

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Surrogate-based acceleration of quasi-Newton techniques for fluid-structure interaction simulations

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COMPUTERS & structureS 2022年 260卷

作者： Delaisse, Nicolas Demeester, Toon Fauconnier, Dieter Degroote, Joris Univ Ghent Dept Electromech Syst & Met Engn Sint Pietersnieuwstr 41 B-9000 Ghent Belgium Univ Ghent Dept Electromech Syst & Met Engn Soete Lab Zwijnaarde 46 B-9052 Zwijnaarde Belgium Flanders Make UGent Core Lab EEDT MP Ghent Belgium

Quasi-Newton methods have proven to be an efficient way to couple partitioned solvers in fluid-structure interaction problems, as they are able to stabilize cases with high added-mass, as well as accelerate the convergence. However, these methods assume that the coupled system is a complete black-box, whereas often, its behavior is well approximated by a surrogate model. Such a model may be obtained by coarsening the system, simplifying the physics, reverting to analytical approximations or considering the system at a previous point in time. The principal idea of this work is to use an initial solution and a Jacobian provided by the surrogate model, to expedite the convergence even further. This article presents a new framework for the inclusion of surrogate models in quasi-Newton methods and positions several existing methods with respect to it. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Quasi-Newton method Surrogate model Partitioned algorithm

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Efficient semi-implicit coupling fluid-structure interaction analysis via model-order reduction of dynamic grids

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AEROSPACE SCIENCE AND TECHNOLOGY 2022年 121卷

作者： Cho, Haeseong Jeonbuk Natl Univ Dept Aerosp Engn 567 Baekje Daero Jeonju Si 54896 Jeollabuk Do South Korea

In this paper, a fluid-structure interaction (FSI) using the model-order reduction (MOR) of dynamic grids is proposed. Within the interface problem between the fluid and the structure, the grid deformation is based on the spring analogy, and it is further extended in order for the efficient computation. In this procedure, the projection-based MOR technique is employed. The relevant MOR technique is realized by using the proper orthogonal decomposition and the discrete empirical interpolation method (POD/DEIM). The resulting FSI framework is based on a semi-implicit coupling approach. In order to achieve this, a characteristic-based split (CBS) scheme is used for an arbitrary Lagrangian-Eulerian (ALE) formulation of the two-dimensional Navier-Stokes equation. Also, a structural analysis is based on the co rotational (CR) formulation in order to simulate the geometrically nonlinear behavior. Both the fluid and structural analyses are combined with the semi-implicit coupling approach, and the relevant algorithm is embedded in the ALE/CBS scheme. Then, the present FSI analysis is verified using three examples, and the computational efficiency is evaluated. The resulting numerical data demonstrated the validity of the present analysis, and it is found that a significant reduction in the computational cost is possibly achieved with the proposed approach. (c) 2022 The Author(s). Published by Elsevier Masson SAS. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： fluid-structure interaction Dynamic girds Proper orthogonal decomposition (POD) Semi-implicit coupling Discrete empirical interpolation method (DEIM)

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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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An immersed interface methodology for simulating supersonic spacecraft parachutes with fluid-structure interaction

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JOURNAL OF fluidS AND structureS 2022年 114卷

作者： Boustani, Jonathan Barad, Michael F. Kiris, Cetin C. Brehm, Christoph Univ Kentucky Dept Mech Engn Lexington KY 40506 USA NASA Computat Aerosci Branch Ames Res Ctr Moffett Field CA 94035 USA Univ Maryland Dept Aerosp Engn College Pk MD 20740 USA

The capability of a computational fluid-structure interaction method for simulating thin shell structures with an immersed boundary method and a nonlinear structural dynamics solver is extended in order to simulate supersonic spacecraft parachutes. Methodologies for the representation and motion tracking of thin, sub-grid resolution, thickness Lagrangian geometries in a static Eulerian background mesh are presented in detail. Logical functions for constructing reliable near-wall finite difference operators in the presence of thin geometries and trapped/concave volumes of space are presented. The Darcy-Forchheimer momentum equation is solved as a jump condition at the immersed interface in order to model the porosity of parachute broadcloth. A parallel contact identification and enforcement strategy based on first principles is introduced and validated. The coupled method is then used to simulate wind tunnel experiments conducted to support the Mars Science Laboratory (MSL) mission. In these experiments, a sub-scale MSL disk-gap-band parachute is inflated in a range of Mach numbers and dynamic pressures. The computational method shows good agreement with the experimental data, and where available, other simulation and empirical data, in terms of the opening load magnitude at various Mach numbers and the sustained aerodynamic performance measured by the coefficient of drag. Following quantitative comparison, a qualitative analysis is performed to investigate the effect of freestream Mach number, material porosity, and the bluff upstream payload on the main flow features. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Immersed interface method Higher-order finite difference methods Cartesian grid methods Porosity modeling fluid-structure interaction Spacecraft parachutes

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