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A generic smoothed wall boundary in multi-resolution particle method for fluid-structure interaction problem

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2021年 378卷 113726-113726页

作者： Sun, Yijie Xi, Guang Sun, Zhongguo Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Peoples R China

Dealing with complex geometry boundaries is a challenge for particle boundary conditions. Since the effective area of the fluid particle is cut off by the boundary, it is difficult to obtain accurate results near the boundary, especially for complex geometry shapes. Things become more complicated when dealing with multiple sizes of particles in multi-resolution particle methods. In this paper, a generic smoothed wall (GSW) boundary is proposed by using single layer particles to accurately discretize the boundary. The boundary weight function is transformed to a distance function to fill the vacancy of the particle number density of fluid particles. The GSW boundary can be applied in the static, moving and non-linear deforming wall conditions. It also can be used to effectively handle complex geometric boundaries, since simulation results are not affected by changes in the number and size of wall particles. In addition, the GSW boundary also shows good results when combined with multi-resolution methods solving problems with multiple sizes of particles. In this paper, the MPS-DEM coupling method with GSW boundary model is applied to solve non-linear FSI problem. Several cases have been calculated to validate the accuracy, convergency and stability of the GSW boundary model. Compared with dummy particle boundary, results show that the proposed GSW boundary model can improve the numerical accuracy near the boundary, and handle arbitrary moving boundaries with high efficiency. (c) 2021 Elsevier B.V. All rights reserved.

关键词： Wall boundary condition Complex geometry boundary Multi-resolution method MPS-DEM fluid-structure interaction

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Comparative Analysis of Strength and Modal Characteristics of a Full Tubular Pump and an Axial Flow Pump Impellers Based on fluid-structure interaction

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ENERGIES 2021年第19期14卷 6395-6395页

作者： Shi, Lijian Zhu, Jun Wang, Li Chu, Shiji Tang, Fangping Jin, Yan Yangzhou Univ Coll Hydraul Sci & Engn Yangzhou 225000 Jiangsu Peoples R China Hydrodynam Engn Lab Jiangsu Prov Yangzhou 225009 Jiangsu Peoples R China Huaian Inst Hydraul Survey & Design Ltd Huaian 223001 Peoples R China Int Ctr Small Hydro Power Hangzhou 310002 Peoples R China

fluid-structure interaction (FSI) was used to determine the structural mechanical characteristics of full tubular and axial-flow pumps. The results showed that as the flow rate increases, the total deformation and equivalent stress are significantly reduced. The max total deformation (MTD) and the max equivalent stress (MES) of the full tubular pump impeller occur on the outer edge of the blade. There are two stress concentrations in the full tubular pump impeller, one of which is located in the outlet area of the rim, and the other is located in the outlet area of the hub. However, the MES of the axial-flow pump appears in the center of the blade hub. The performance difference between the full tubular pump and the axial-flow pump is mainly caused by the clearance backflow. The natural frequency of the full tubular pump is lower than that of the axial-flow pump on the basis of the modal results. The MES of the full tubular pump is mainly concentrated at the junction of the blade and the motor rotor, and the max thickness of the rim is 6mm, which can be more prone to cracks and seriously affect the safety and stability of the pump.

关键词： full tubular pump axial-flow pump deformation stress modal analysis fluid-structure interaction numerical simulation

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Benchmark study on slamming response of flat-stiffened plates considering fluid-structure interaction

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MARINE structureS 2021年 79卷 1页

作者： Dac Dung Truong Jang, Beom-Seon Janson, Carl-Erik Ringsberg, Jonas W. Yamada, Yasuhira Takamoto, Kota Kawamura, Yasumi Ju, Han-Baek Seoul Natl Univ Res Inst Marine Syst Engn Dept Naval Architecture & Ocean Engn Seoul South Korea Nha Trang Univ Dept Engn Mech Nha Trang Vietnam Chalmers Univ Technol Div Marine Technol Dept Mech & Maritime Sci Gothenburg Sweden Natl Inst Maritime Port & Aviat Technol Natl Maritime Res Inst Tokyo Japan Yokohama Natl Univ Dept Syst Design Ocean Space Yokohama Kanagawa Japan Tokyo Univ Agr & Technol Dept Mech Syst Engn Tokyo Japan

This paper presents a benchmark study on the slamming responses of offshore structures' flat stiffened plates. The objective was to compare the fluid-structure interaction (FSI) simulation methodologies, modeling techniques, and established researchers' experiences in predicting slamming pressure. Three research groups employing the most common commercial software packages for numerical FSI simulations (i.e. LS-Dyna ALE, LS-Dyna ICFD, ANSYS CFX, and StarCCM+/ABAQUS) participated in this study. Wet drop test data on flat-stiffened aluminum plates of light-ship-like bottom structures available in the open literature was utilized for validation of the FSI modeling. A summary of the experimental conditions including the geometry model and material properties, was distributed to the participants prior to their simulations. A parametric study on flat-stiffened steel plates having actual scantlings used in marine installations was performed to investigate the effect of impact velocity and plate rigidity on slamming response. The FE simulation results for the total vertical forces acting on the stiffened plates and their structural responses to those forces, as obtained from the participants, were analyzed and compared. The reliable and accurate predictions of slamming loads using the aforementioned commercial FSI software packages were evaluated. Additionally, equivalent static slamming pressures resulting in the same permanent deflections, as observed from the FSI simulations, were reported and compared with analytical models proposed by the Classification Standards DNV and existing experimental data for calculation of the slamming pressure. The study results showed that the equivalent load model depends on the water impact velocity and plate rigidity;that is, the equivalent static pressure coefficient decreases with an increase in impact velocity, and increases when impacting structures become stiffer.

关键词： Benchmark study Equivalent static pressure Flat-stiffened plate fluid-structure interaction Permanent deflection Slamming pressure coefficient

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A fluid-structure interaction model for free-surface flows and flexible structures using smoothed particle hydrodynamics on a GPU

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JOURNAL OF fluidS AND structureS 2021年 104卷 103312-103312页

作者： O'Connor, Joseph Rogers, Benedict D. Univ Manchester Dept Mech Aerosp & Civil Engn Manchester Lancs England

This paper presents the development of a numerical model for violent hydrodynamics of free-surface flows interacting with flexible structures using the meshless smoothed particle hydrodynamics (SPH) method accelerated with a graphics processing unit (GPU). The present work implements a unified SPH framework to solve both the fluid and structural dynamics within the open-source SPH code DualSPHysics. Well-known deficiencies with SPH-based structural modelling (linear inconsistency, tensile instability and rank deficiency) are addressed by adopting a Total Lagrangian formulation with kernel correction and zero-energy mode suppression. The fluid-structure coupling is handled via manipulation of the existing boundary condition within DualSPHysics, which does not require any geometrical knowledge of the interface. This, together with the unified SPH framework, permits straightforward implementation within DualSPHysics and retains its parallel scalability on hardware acceleration platforms, in particular on GPUs. An extensive validation and profiling of the proposed model is carried out for a range of challenging 2-D and 3-D test cases incorporating violent free-surface flows, nonlinear structural dynamics and complex fluid-structure interactions, and its performance is characterised and quantified. The analysis shows good agreement between the proposed model and analytical/benchmark solutions from the literature. Furthermore, the GPU profiling shows speedups on a single GPU of up to 40, compared to an optimised 12-core (24 threads) central processing unit (CPU) version. These findings indicate the proposed model is a viable and efficient approach to simulating violent free-surface fluid-structure interactions. (C) 2021 The Authors. Published by Elsevier Ltd.

关键词： Smoothed particle hydrodynamics fluid-structure interaction Graphics processing units DualSPHysics

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Mathematical Modeling and Numerical Simulation of Atherosclerotic Plaque Progression Based on fluid-structure interaction

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JOURNAL OF MATHEMATICAL fluid MECHANICS 2021年第3期23卷 74-74页

作者： Pozzi, Silvia Redaelli, Alberto Vergara, Christian Votta, Emiliano Zunino, Paolo Politecn Milan MOX Dipartimento Matemat Piazza Leonardo da Vinci 32 I-20133 Milan Mi Italy Politecn Milan Dipartimento Elettron Informaz & Bioingn Piazza Leonardo da Vinci 32 I-20133 Milan Mi Italy Politecn Milan Dipartimento Chim Mat & Ingn Chim Giulio Natta LaBS Piazza Leonardo da Vinci 32 I-20133 Milan Mi Italy

In this work we propose a mathematical and numerical model to describe the early stages of atherosclerotic plaque formation, which is based on the interaction of processes with different spatial and temporal scales. A fluid-structure interaction problem, used to describe the cardiovascular mechanics arising between blood and the artery wall, is coupled to a set of differential problems describing the evolution of solute concentrations. In order to manage the multiscale-in-space nature of the involved processes, we propose a suitable numerical strategy based on the splitting and sequential solution of the coupled problem. We present some preliminary numerical results and investigate the effects of geometry, model parameters and coupling strategy on plaque growth.

关键词： fluid-structure interaction Systems of partial differential equations Diffusion-reaction problems Wall shear stress Atherosclerosis Plaque progression

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Transient-based leak detection in the frequency domain considering fluid-structure interaction and viscoelasticity

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2021年 153卷 107500-107500页

作者： Keramat, Alireza Karney, Bryan Ghidaoui, Mohamed S. Wang, Xun Hong Kong Polytech Univ HKPolyU Dept Civil & Environm Engn Hong Kong Peoples R China Univ Toronto Dept Civil & Mineral Engn 44 St George St Toronto ON M5S 2E4 Canada Hong Kong Univ Sci & Technol Dept Civil & Environm Engn Clear Water Bay Hong Kong Peoples R China Beihang Univ Sch Reliabil & Syst Engn Key Lab Reliabil & Environm Engn Technol Xueyuan Rd 37 Beijing 100083 Peoples R China

Waterhammer induced fluid-structure interaction (FSI) of a leaky viscoelastic (VE) pipe is simulated in the frequency-domain. The developed model is then applied to assess the accuracy of leak detection when both FSI and VE phenomena are represented. FSI arises due to the coupling of wall stress and pressure waves, which can significantly distort the response spectra. The frequency response of the transient waves is derived using the transfer matrix method, which is then exploited for localization using a maximum likelihood estimate. Several numerical cases including one or two leaks are studied while Poisson and junction coupling both with and without VE wall behaviour. The results demonstrate that including FSI effects can allow leaks to be more accurately located. Not surprisingly, the importance of FSI mechanisms in leak detection is shown to be more crucial in VE pipes than in elastic pipes because of their larger Poisson effects. Crown Copyright (C) 2020 Published by Elsevier Ltd. All rights reserved.

关键词： Leak detection Waterhammer fluid-structure interaction Maximum likelihood estimation Viscoelasticity

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A novel fluid-structure interaction algorithm for compressible flows and deformable structures

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JOURNAL OF COMPUTATIONAL PHYSICS 2021年 426卷 109921-109921页

作者： Ning Jianguo Zhang Hetao Xu Xiangzhao Ma Tianbao Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 10081 Peoples R China

In this study, we propose a new immersed boundary method for compressible fluid-structure interaction simulations. We take a partitioned coupling strategy that comprises three parts: fluid solver, structure solver, and fluid-structure boundary treatment. The fluid solver is implemented by a second-order finite volume scheme, and the structure is solved by an implicit finite element solver. For the boundary treatment, this method employs a multilevel marking algorithm to determine the direction from the inside of the structure to the outside. Following the direction, fluids that permeate the structure are transported out of the structure boundaries to satisfy the boundary conditions. This method strictly maintains mass conservation and uses no cross-boundary fitting or interpolation;thus, it appears to be convenient when treating complex-shaped or deformable structures and diminishes the singularity problem. The 1D and 2D numerical experiments show that our method is capable of obtaining approximately first-order convergent results, agreeing well with the published data. The method's limitations are discussed in the conclusion. (C) 2020 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Immersed boundary method Finite volume method Compressible flow Chimera grid

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A Nitsche stabilized finite element method: Application for heat and mass transfer and fluid-structure interaction

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2021年 386卷 114101-114101页

作者： Liu, Bin Natl Univ Singapore Dept Mech Engn Singapore 119077 Singapore

A Nitsche stabilized finite element method is proposed for heat & mass transfer and fluid-structure interaction. The GLS/PSPG stabilization is employed to stabilize the finite element formulation. The Nitsche's methods are employed to weakly impose the Dirichlet condition for heat & mass transfer. An upwind term is included in Nitsche's methods to enhance the stability for fast moving interfaces. The Ghost penalty method is employed to control the jumps across the cut cells. The projection-based adaptive Gauss quadrature (PAGQ) scheme is used for the numerical integration of the discontinuous function. The nonlinear advection-diffusion equations are linearized by Newton procedure. The second-order accurate unconditionally stable generalized-a time integration is implemented to march the solution in time. The fluid and the structure equations are weakly coupled by a second-order accurate staggered-partitioned scheme. Numerical examples include the cases of fixed/vibrating/rotating cylinder(s) for heat & mass transfer and fluid-structure interaction in enclosure and external flow. The obtained numerical results match well with the experiments, the empirical correlation and the numerical simulations in literature. This methodology efficiently and accurately simulates the complex physics of heat & mass transfer. (C) 2021 Elsevier B.V. All rights reserved.

关键词： Nitsche's method GLS/PSPG stabilization Ghost penalty method Projection-based adaptive gauss quadrature Heat & mass transfer fluid-structure interaction

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Analysis of finite element and finite volume methods for fluid-structure interaction simulation of blood flow in a real stenosed artery

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INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2021年 207卷 106650-106650页

作者： Lopes, D. Agujetas, R. Puga, H. Teixeira, J. Lima, R. Alejo, J. P. Ferrera, C. Univ Minho Mech Engn Dept CMEMS UMinho Campus Azurem P-4800058 Guimaraes Portugal Univ Extremadura Dept Ingn Mecan Energet & Mat Badajoz 06006 Spain Univ Extremadura Inst Comp Cient Avanzada ICCAEx Badajoz 06006 Spain Univ Minho Mech Engn Dept MEtRICs Campus Azurem P-4800058 Guimaraes Portugal Univ Porto CEFT Fac Engn FEUP Rua Roberto Frias P-4200465 Porto Portugal Complejo Hosp Univ Badajoz Serv Radiol Badajoz 06006 Spain Univ Extremadura Dept Ciencias Biomed Badajoz 06006 Spain

This paper presents a qualitative and quantitative comparison between the finite element and the finite volume methods for the fluid-structure interaction simulation of blood flow through a real stenosed artery. The artery geometry corresponds to a severely stenosed (around 75% lumen reduction) portion of the brachiocephalic trunk, located immediately upstream of the bifurcation of this vessel into the right subclavian and right common carotid arteries. The patient-specific geometry was segmented from medical images of a computerized tomography scanner from an individual with the subclavian steal syndrome. Doppler ultrasound velocity measurements were used to determine and impose patient-specific boundary conditions. The numerical simulations were performed in commercial software, Ansys and COMSOL, with a comparative second order discretization for the pressure, velocity and displacement variables. The results of this research disclosed a reasonable overall agreement between the predicted hemodynamics for both approaches. The finite volume method software (Ansys) proved to be more efficient in computational time and memory requirements.

关键词： fluid-structure interaction Blood flow Patient-specific Stenosed artery

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Manipulation of the granular fluid-structure interaction via sliding coating layers

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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2021年 157卷 104005-104005页

作者： Goel, A. Wadley, H. N. G. Deshpande, V. S. Univ Cambridge Dept Engn Trumpington St Cambridge CB2 1PZ England Univ Virginia Sch Engn & Appl Sci Dept Mat Sci & Engn Charlottesville VA 22904 USA

The use of sliding coating layers on structures is investigated as an approach to manipulate the transfer of momentum during the impact of granular matter with rigid and deformable structures. We first report an experimental investigation of the momentum transfer into rigid stationary targets with fixed and sliding coating layer impacted by high velocity granular slugs. Friction between the impacting granular particles and the target surface enhances the momentum transfer during the interaction with the target. By introducing a sliding coating layer with a lubricated target surface-coating interface, the momentum transfer is reduced: the coating slides on the target surface dragged along by friction between the coating and the particles but, the low friction between the coating and the target reduces the transfer of frictional forces into the target. Coupled discrete element and Lagrangian finite element simulations with rod-shaped granular particles are shown to capture the measurements with high fidelity. This numerical approach is then used to investigate the use of sliding coatings on deformable edge-clamped plates. Introduction of a coating layer while keeping the total mass of the plate constant, reduces the thickness of the plates and this in turn reduces their bending strength. The consequence is that momentum transfer reductions are lost as a result of the reduced bending strength and the minimum plate deflection is attained when no coating layer is present. We thus conclude that sliding coating layers can result in momentum transfer reductions when used on relatively rigid targets but result in a degradation of impact resistance performance when used on highly deformable structures.

关键词： fluid-structure interaction Granular media Discrete element method

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