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An efficient computational model for fluid-structure interaction in application to large overall motion of wind turbine with flexible blades

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APPLIED MATHEMATICAL MODELLING 2020年第Part1期77卷 392-407页

作者： Boujleben, Abir Ibrahimbegovic, Adnan Lefrancois, Emmanuel Sorbonne Univ Univ Technol Compiegne Chair Computat Mech Lab Roberval Mecan F-60205 Compiegne France

This paper proposes a very efficient computational model for fluid-structure interaction problems corresponding to steady-state flow representing a large overall motion of wind turbines with flexible blades. The model of turbine blades is based upon the 3D solids finite elements with drilling rotations. The proposed 3D solids model is fully able to describe the flexibility blades large overall motion and easily capture both bending and torsional motion thanks to using an enhanced strain field. The model efficiency is further reinforced by using the 3D panel method that fits naturally with proposed 3D solid finite elements for blades. The proposed panel method is the corresponding modification of the potential fluid flow by introducing a vorticity layer at the fluid-structure interface and Bernoulli's conservation momentum equation in order to provide quantification for the blade thrust. The fluid-structure interaction is enforced through an efficient iterative procedure providing on one hand a very fast computation of aerodynamic loads, which is sufficiently accurate for computing the overall thrust on the blade, and on the other hand a sufficiently accurate representation of the stress states suitable for fatigue studies. The proposed computational model performance is illustrated with several numerical simulations, including the practical case of a full-scale NREL 5MW wind turbine. (C) 2019 Elsevier inc. All rights reserved.

关键词： fluid-structure interaction 3D vortex panel method Large overall motion Follower pressure Wind turbine blades

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A weakly compressible hybridizable discontinuous Galerkin formulation for fluid-structure interaction problems

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2020年 372卷 113392-113392页

作者： La Spina, Andrea Kronbichler, Martin Giacomini, Matteo Wall, Wolfgang A. Huerta, Antonio Tech Univ Munchen TUM Lehrstuhl Numer Mech LNM Garching Germany Univ Politecn Catalunya UPC Lab Calcul Numer LaCaN Barcelona Spain Ctr Int Metodes Numer Engn CIMNE Barcelona Spain

A scheme for the solution of fluid-structure interaction (FSI) problems with weakly compressible flows is proposed in this work. A novel hybridizable discontinuous Galerkin (HDG) method is derived for the discretization of the fluid equations, while the standard continuous Galerkin (CG) approach is adopted for the structural problem. The chosen HDG solver combines robustness of discontinuous Galerkin (DG) approaches in advection-dominated flows with higher-order accuracy and efficient implementations. Two coupling strategies are examined in this contribution, namely a partitioned Dirichlet-Neumann scheme in the context of hybrid HDG-CG discretizations and a monolithic approach based on Nitsche's method, exploiting the definition of the numerical flux and the trace of the solution to impose the coupling conditions. Numerical experiments show optimal convergence of the HDG and CG primal and mixed variables and superconvergence of the postprocessed fluid velocity. The robustness and the efficiency of the proposed weakly compressible formulation, in comparison to a fully incompressible one, are also highlighted on a selection of two and three dimensional FSI benchmark problems. (C) 2020 ElsevierB.V. All rights reserved.

关键词： fluid-structure interaction Finite elements Hybridizable discontinuous Galerkin Weakly compressible flows Navier-Stokes equations Nitsche's method

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The effect of the entry and re-entry size in the aortic dissection: a two-way fluid-structure interaction simulation

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2020年第6期19卷 2643-2656页

作者： Keramati, Hamed Birgersson, Erik Ho, Jackie P. Kim, Sangho Chua, Kian Jon Leo, Hwa Liang Natl Univ Singapore NUS Grad Sch Integrat Sci & Engn Singapore Singapore Natl Univ Singapore Dept Biomed Engn Singapore Singapore Natl Univ Singapore Dept Mech Engn Singapore Singapore Natl Univ Singapore Yong Loo Lin Sch Med Dept Cardiac Thorac & Vasc Surg Singapore Singapore Natl Univ Singapore Yong Loo Lin Sch Med Dept Surg Singapore Singapore

Aortic dissection (AD) is one of the most catastrophic cardiovascular diseases. AD occurs when a layer inside the aorta is disrupted and gives rise to the formation of a true lumen and a false lumen. These lumens can be connected through tears in the intimal flap which are known as entries. Despite being known for about two centuries, the effects of many factors on the morbidity and mortality of this disease are still unknown. As the blood interaction with the aorta is crucial in the severity and the progression of the aortic dissection, a biomechanical approach is chosen to investigate the influence of different morphologies on the severity of this disease. Using the finite element method (FEM) and the fluid-structure interaction (FSI) approach, we have evaluated the blood flow characteristics along the diseased aorta, in conjunction with the deformation of the aortic wall. In this study, an idealized geometry of a dissected descending aorta (type B) with two entries has been studied. The values for the diameter of the entry tear were chosen to be 5 mm and 10 mm. Therefore, a total of four conditions were investigated. According to our results, the retrograde flow through the proximal tear is dependent on the size of the distal re-entry and vice versa. Our results revealed that when both entry and re-entry tears are 10 mm in diameter, the flow passes through the true and false lumens with smaller resistance, resulting in a smaller flutter of the intimal flap, and therefore more stable intimal flap. Major oscillation frequencies of 2.5 Hz and 7.4 Hz were observed for the oscillation of the intimal flap, and amplitudes of the waves with higher frequencies were negligible.

关键词： Aortic dissection Entry tear fluid-structure interaction Fluttering Hemodynamics

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fluid-structure-SOIL interaction STUDY FOR NUCLEAR FACILITIES WITH LARGE POOL WATER CONSIDERING NONLINEAR STRUCTURAL BEHAVIOR 31

FLUID-STRUCTURE-SOIL INTERACTION STUDY FOR NUCLEAR FACILITIE...

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31st International Conference on Nuclear Engineering (ICONE) - 24/7 Clean Nuclear Energy - Solution for Global Warming

作者： Sato, Yuki Ghiocel, Dan M. Kataoka, Shunji Morimoto, Yasutomi JGC Corp Yokohama Kanagawa Japan Ghiocel Predict Technol Inc New York NY USA

ISBN: (纸本)9780791888292

This study investigates the effects of the fluid-structure-Soil interaction (FSSI) on the seismic responses of a deeply embedded nuclear facility with large water pools under severe earthquakes. This paper presents new seismic analysis method considering FSSI using 3D FEM for deeply embedded typical RC (Reinforced Concrete) shear wall nuclear buildings. In the new method, the commercial SSI analysis software, ACS SASSI was used with Option AA-F, which treats ANSYS fluid element fluid80 dynamic matrices in ACS SASSI environment. By using the method it was confirmed that large pool water in the building provides significant local deformation of the pool walls, while the effects on other part of the structures are almost negligible from engineering point of view. To investigate more with the structure behavior during severe earthquakes, the nonlinear behavior of the structure was also taken into account with the new FSSI method using ACS SASSI NQA Option NON. To model the RC wall nonlinear behavior, their nonlinear backbone curves (BBCs) were computed using both Japanese and America standards. Then, the nonlinear analysis responses with both standards were compared. It was confirmed that the nonlinear structure behavior produced a visible shift of the ISRS spectral peak responses to the lower frequencies in comparison with the response of linear analysis. Also, although some significant differences of seismic responses were not observed between Japanese standard and American standard, it was confirmed that the differences of formulae in each code were reflected on their seismic responses.

关键词： soil-structure interaction fluid-structure interaction nonlinear analysis RC structure 3D FEM

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Analysis and finite element discretization for optimal control of a linear fluid-structure interaction problem with delay

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IMA JOURNAL OF NUMERICAL ANALYSIS 2020年第1期40卷 140-206页

作者： Peralta, Gilbert Kunisch, Karl Univ Philippines Baguio Dept Math & Comp Sci Governor Pack Rd Baguio 2600 Philippines Karl Franzens Univ Graz Inst Math & Sci Comp Heinrichstr 36 A-8010 Graz Austria Austrian Acad Sci RICAM Inst Altenbergerstr 69 A-4040 Linz Austria

An optimal control problem for a linearized fluid-structure interaction model with a delay term in the structural damping is analyzed. A distributed control acting on the fluid domain, structure domain or both is considered. The necessary optimality conditions are derived both for rough and smooth initial data. A parabolic regularization of the problem and its convergence are investigated. Finite element discretization for the regularized problem and error estimates are provided. Piecewise linear elements with bubble functions for the fluid and a discontinuous Galerkin scheme for the spatial and temporal discretizations are utilized respectively. Numerical experiments illustrating the theoretical results are given.

关键词： fluid-structure interaction delay optimal control space-time finite elements error estimates

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Computation of Stress Distribution in Hydraulic Horizontal Propeller Turbine Runner Based on fluid-structure interaction Analysis

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2020年第11期45卷 9325-9337页

作者： Waqas, Muhammad Ahmad, Naseer Pakistan Inst Engn & Technol Dept Mech Engn Multan Pakistan Univ Engn & Technol Dept Mech Engn Lahore Pakistan

In the hydro-turbine operation, the kinetic energy of flowing fluid is converted into mechanical energy. In the turbine operation, fluid induces hydraulic load that not only provides a useful mechanical driving torque on the turbine shaft but also causes deformation in turbine components and stress distribution that might induce a structure failure. Structural failure in turbine component decreases performance as well as increases the maintenance cost of hydro-turbines. In this paper, fluid-structure interaction model is used to investigate the stress distribution and total deformation of hydraulic horizontal propeller turbine runner (HHPTR) with different flow velocities, blade widths and blade wrap angles. The results showed that the effects of blade wrap angles and blade width significantly influence the performance and structural strength of the HHPTR. Maximum turbine performance was observed at blade wrap angle of 100 degrees and blade width of 2 mm. It was also found that the maximum value of equivalent stress near the runner hub is 59.54 MPa at blade wrap angle 100 degrees. Similarly, the maximum value of total deformation in HHPTR is 0.7689 mm near the runner blade edges at blade wrap angle 60 degrees.

关键词： fluid-structure interaction Propeller turbine Blade wrap angle Runner blades Computational fluid dynamics Finite element method

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Existence of a weak solution to the fluid-structure interaction problem in 3D

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JOURNAL OF DIFFERENTIAL EQUATIONS 2020年第4期268卷 1495-1531页

作者： Trifunovic, Srdan Wang, Ya-Guang Shanghai Jiao Tong Univ Sch Math Sci Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Sch Math Sci MOE LSC Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ SHL MAC Shanghai 200240 Peoples R China

We study a nonlinear fluid-structure interaction problem in which the fluid is described by the three-dimensional incompressible Navier-Stokes equations, and the elastic structure is modeled by the nonlinear plate equation which includes a generalization of Kirchhoff, von Karman and Berger plate models. The fluid and the structure are fully coupled via kinematic and dynamic boundary conditions. The existence of a weak solution is obtained by designing a hybrid approximation scheme that successfully deals with the nonlinearities of the system. We combine time-discretization and operator splitting to create two subproblems, one piece-wise stationary for the fluid and one in the Galerkin basis for the plate. To guarantee the convergence of approximate solutions to a weak solution, a sufficient condition is given on the number of time discretization sub-intervals in every step in a form of dependence with number of the Galerkin basis functions and nonlinearity order of the plate equation. (C) 2019 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Incompressible viscous fluid Nonlinear plate Three space variables Weak solution

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fluid-structure interaction Analysis of Perfusion Process of Vascularized Channels within Hydrogel Matrix Based on Three-Dimensional Printing

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POLYMERS 2020年第9期12卷 1898页

作者： Yang, Shuai Shi, Jianping Yang, Jiquan Feng, Chunmei Tang, Hao Nanjing Normal Univ Sch Elect & Automat Engn Nanjing 210023 Peoples R China Nanjing Normal Univ Jiangsu Key Lab Printing Equipment & Mfg 3D Nanjing 210042 Peoples R China

The rise of three-dimensional bioprinting technology provides a new way to fabricate in tissue engineering in vitro, but how to provide sufficient nutrition for the internal region of the engineered printed tissue has become the main obstacle. In vitro perfusion culture can not only provide nutrients for the growth of internal cells but also take away the metabolic wastes in time, which is an effective method to solve the problem of tissue engineering culture in vitro. Aiming at user-defined tissue engineering with internal vascularized channels obtained by three-dimensional printing experiment in the early stage, a simulation model was established and the in vitro fluid-structure interaction finite element analysis of tissue engineering perfusion process was carried out. Through fluid-structure interaction simulation, the hydrodynamic behavior and mechanical properties of vascularized channels in the perfusion process was discussed when the perfusion pressure, hydrogel concentration, and crosslinking density changed. The effects of perfusion pressure, hydrogel concentration, and crosslinking density on the flow velocity, pressure on the vascularized channels, and deformation of vascularized channels were analyzed. The simulation results provide a method to optimize the perfusion parameters of tissue engineering, avoiding the perfusion failure caused by unreasonable perfusion pressure and hydrogel concentration and promoting the development of tissue engineering culture in vitro.

关键词： three-dimensional bioprinting vascularized channels perfusion pressure hydrogel concentration fluid-structure interaction crosslinking density

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Computational analysis of Nitinol stent-graft for endovascular aortic repair (EVAR) of abdominal aortic aneurysm (AAA): Crimping, sealing and fluid-structure interaction (FSI)

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INTERNATIONAL JOURNAL OF CARDIOLOGY 2020年第0期304卷 164-171页

作者： Jayendiran, Raja Nour, Bakr Ruimi, Annie Texas A&M Univ Qatar Mech Engn Program Doha Qatar Weill Cornell Med Qatar Doha Qatar

Objectives: We evaluate the crimping strain, sealing stress and contact forces on a Nitinol stent deployed in the aorta during endovascular aortic (or aneurysm) repair (EVAR) procedures. Nitinol shape memory effect (SME) is used. We also study the fluid-structure interaction (FSI) of the blood flow on the stented aorta. Methods: We employ Solidworks to generate a closed-cell honeycomb stent structure used to treat abdominal aortic aneurysm (AAA). We use the commercial Abaqus/Simulia finite element (FEM) simulation package to study the displacements and stresses experienced by the stent during the crimping phase and deployment into the aortic segment. The Nitinol stent is covered with Dacron, a popular graft material. We implement our own user-material (UMAT) subroutines to model the shape memory effect (SME) of Nitinol. The effect of the stent geometry is analyzed. We use the FSI analysis in Abaqus/Simulia to understand the effect of hemodynamic loading on the stent. Results: Results indicate that the crimping strain increases as the stent strut spacing increases. This is also the case for the radius of curvature. Maximum strains developed on the stent during crimping are in the order of 10%. Stresses exerted by the stent needed to completely seal the aorta are found to be below the yield stress values of Nitinol (700 MPa). Wall shear stresses (WSS) on the stented aorta are close to WSS obtained on the aorta alone. Conclusion: Using Nitinol's thermo-reactivity property as opposed to its superelasticity causes the stent-graft to deploy more gently. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Stent-graft Crimping Sealing stress fluid-structure interaction Wall shear stress Nitinol

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fluid-structure interaction during water hammer in a pipeline with different performance mechanisms of viscoelastic supports

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JOURNAL OF SOUND AND VIBRATION 2020年 487卷 115527-115527页

作者： Hosseini, Rahil Sadat Ahmadi, Ahmad Zanganeh, Roohollah Shahrood Univ Technol Dept Civil Engn Shahrood Iran Iran Univ Sci & Technol Dept Civil Engn Tehran Iran

The aim of this research is to model various types of viscoelastic supports and to investigate their effects on the fluid-structure interaction (FSI) during the water hammer in straight pipeline systems. Three performance mechanisms of viscoelastic supports are considered. The first is the viscoelastic supports with axial deformation, the second is viscoelastic supports with shear deformation and the third is the viscoelastic supports with both sliding and shear deformation mechanisms. The Poisson and junction coupling were taken into account as the main interacting mechanisms. The viscoelastic behavior of the pipe-wall and the supports was described by the generalized Kelvin-Voigt mechanical model. By providing boundary conditions for the different types of viscoelastic supports modeling at the valve location and along the pipe, the governing equations were solved using the full MOC method in the time domain. The results demonstrated that the use of viscoelastic supports with axial and shear deformation mechanisms are effective in the damping of the pressure head vibrations and reducing the displacement of the pipe-wall caused by FSI. The viscoelastic supports with the shear deformation mechanism exhibited better performance compared to those with the axial deformation mechanism. The results also showed that the behavior of viscoelastic supports with both sliding and shear mechanisms depended on the amount of frictional force in the supports. Using plates with an appropriate friction coefficient for the sliding viscoelastic supports caused a significant reduction in the amount of pressure head and displacement of the pipe-wall as well as considerable pressure head fluctuations damping compared to the performance of two other mechanisms of viscoelastic supports in a similar situation, especially in the elastic pipe. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Water hammer Viscoelastic support Sliding (friction) support Full MOC method

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