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fluid-structure interaction analysis of the influences of structural parameters on the dynamic properties of aerostatic journal bearing

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NONLINEAR DYNAMICS 2024年第13期112卷 10759-10782页

作者： An, Lei Wang, Wei Wang, Chaoqun Zheng, Yueqing Univ Elect Sci & Technol China Sch Mech & Elect Engn Chengdu 611731 Peoples R China Sichuan Precis & Ultraprecis Machining Engn Techno Chengdu 610200 Peoples R China

One of the outstanding advantages of aerostatic bearing is high speed, which is the basic component for various ultra-precision machining. Compared with thrust bearing, journal bearing is less studied and more complex. Structural parameters have great influences on the static properties of the bearing. However, due to the strong coupling, the study of the structural parameters on the bearing dynamic properties at high speed is insufficient. The fluid-structure interaction model of the bearing is formed by directly combining the pressure distribution equations of the gas film, the spindle motion equation, and the flow balance equations. The coupled equations are numerically solved using the two-way alternating implicit scheme method, the Newton iteration method, the Thomas algorithm, and the Newmark method. The influences of orifice diameter, bearing clearance, recess length, and recess height on the dynamic properties of the system are investigated. The results show that the structural parameters play a prominent influence on the bearing flow field and the spindle motion. With the change of the structural parameters, the system appears as T-periodic motion, multiple T-periodic motion, and quasi-periodic motion. The research contributes to the structural optimization and performance enhancement of aerostatic journal bearing.

关键词： Aerostatic journal bearing fluid-structure interaction Structural parameters Dynamic properties

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fluid-structure interaction investigation for coal-water slurry preheaters: Effects of different loads on mechanical performance

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NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 2024年第1期85卷 42-59页

作者： Xiao, Juan Duan, Xudong Wang, Simin Zhang, Zaoxiao Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian Peoples R China Xi An Jiao Tong Univ Sch Chem Engn & Technol 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China

The mechanical performance caused by fluid pressure or uneven temperature in heat exchangers is important to predict dangerous locations and guide the manufacture or installation. Under the background of coal-water slurry (CWS) preheating technology, using fluid-structure interaction, the distribution law, and mechanism of von Mises stress and deformation for CWS preheaters under different loads were studied, and sensitivity analysis combining metamodel of prognosis was carried out to determine the most influential parameters on mechanical performance. The results illustrate maximum von Mises stress under coupled pressure and temperature occurs at the perforated location on the baffle closed to the shell outlet, but maximum total deformation is located at the outer edge of the baffle near the shell inlet. When the folding angle, folding ratio, relative height is 30 & DEG;, 0.4, and 0.5, respectively, under coupled loads, the thermal stress is dominant at lower velocity, and total deformation caused by the pressure is dominant at all different shell-inlet velocities. With increasing shell-inlet velocity, maximum von Mises stress decreases first and then increases, and maximum total deformation increases. The shell-inlet velocity and relative height are the most influential and non-influential parameters, respectively, for maximum total deformation. The research lays the foundation of mechanical analysis for material failure, structure destruction, and parameter screening of design variables for CWS preheaters.

关键词： fluid-structure interaction heat exchanger mechanical performance metamodel sensitivity analysis

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fluid-structure interaction study of natural convection heat transfer over a flexible oscillating fin in a square cavity

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INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2017年第0期111卷 256-273页

作者： Ghalambaz, Mohammad Jamesahar, Esmail Ismael, Muneer A. Chamkha, Ali J. Islamic Azad Univ Dezful Branch Dept Mech Engn Dezful Iran Univ Basrah Engn Coll Dept Mech Engn Basrah Iraq Prince Mohammad Bin Fahd Univ Dept Mech Engn Al Khobar 31952 Saudi Arabia Prince Mohammad Bin Fahd Univ Prince Sultan Endowment Energy & Environm Al Khobar 31952 Saudi Arabia

The material of this study is a numerical formulation of a fluid-structure interaction represented by an oscillating elastic fin attached to a hot vertical wall of a square cavity. The cavity is filled with air, Pr = 0.7, and differentially heated while the horizontal walls are kept adiabatic. The finite element Galerkin method with the aid of the Arbitrary Lagrangian-Eulerian (ALE) procedure is used in the numerical analysis. The elastic fin undergoing an excitation and is subjected to buoyancy forces. The ranges of the studied parameters are the Rayleigh number Ra = 10(4)-10(7), fin length L = 0.1-0.4, oscillating amplitude A = 0.001-0.1, oscillating period tau = 0.01-1, thermal conductivity ratio (fin to fluid) k(r) = 1-1000, and the non-dimensional Young's modulus E = 10(8)-10(13). The results show that increasing the non dimensional amplitude the oscillating fin can significantly enhance the Nusselt number. The non dimensional periods about tau = 0.1 and higher shows better enhancement compared to lower periods. A fin length of 0.2 can be considered as the best length for heat transfer enhancement and compatible with various oscillating amplitudes. (C) 2016 Elsevier Masson SAS. All rights reserved.

关键词： Oscillating fin Cavity Natural convection fluid-structure interaction

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fluid-structure interaction in two-phase flow using a discrete forcing method

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2019年第5期91卷 247-261页

作者： Benguigui, W. Lavieville, J. Merigoux, N. EDF R&D Fluid Mech Energy & Environm Dept 6 Quai Wafter F-78400 Chatou France Univ Paris Saclay IMSIA UMR EDF CNRS CEA ENSTA 9219 F-91762 Palaiseau France

The numerical simulation of interaction between structures and two-phase flows is a major concern for many industrial applications. Using a discrete forcing method (see the work of Benguigui et al) (implemented in a multiphase CFD code based on a two-fluid approach) to track the solid motion in two-phase flow, an iterative fluid-structure coupling is developed to allow free-motion of multiple solids (with any kind of geometry) due to two-phase fluid forces. As the fluid-structure interface is located thanks to a time and space dependent porosity on a cartesian grid, the fluid force computation is accommodated to the interface tracking method. A Newmark algorithm is used to estimate the solid motion. The iterative coupling is addressed in detail going from the algorithm to the determination of its convergence parameter. Three application cases are proposed to validate the method from motion under a single- to a two-phase flow.

关键词： CFD fluid-structure interaction immersed boundary two-phase flow

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fluid-structure interaction in pipe coils during hydraulic transients

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JOURNAL OF HYDRAULIC RESEARCH 2017年第4期55卷 491-505页

作者： Ferras, D. Manso, P. A. Covas, D. I. C. Schleiss, A. J. Univ Lisbon Inst Super Tecn CERIS Lisbon Portugal Ecole Polytech Fed Lausanne Lab Hydraul Construct Lausanne Switzerland

The paper presents the analysis of fluid-structure interaction occurring during hydraulic transients in pipe coils by means of a four-equation model. The purpose is to understand and describe the effect of the coil movement on the transient wave. The four-equation model couples the transient pipe flow with the axial movement of the pipe-wall neglecting radial inertia, flexure and torsion of the piping system. Three models have been developed: the first simplifying the coil to a straight pipe with a moving valve, the second model assuming independent axial deformation in each coil ring, and the third model that includes dry friction dissipation. The first allows an easier generalization of the method;however, it does not allow the complete description of the phenomenon;the second and third models fit better the experimental observations in the pipe coil facility, suggesting that its behaviour is dominated by the independent movement of the rings.

关键词： fluid-structure interaction hydraulic transient junction coupling Poisson coupling stress-strain analysis four-equation model

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fluid-structure interaction simulations of cerebral arteries modeled by isotropic and anisotropic constitutive laws

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COMPUTATIONAL MECHANICS 2015年第3期55卷 479-498页

作者： Tricerri, Paolo Dede, Luca Deparis, Simone Quarteroni, Alfio Robertson, Anne M. Sequeira, Adelia Ecole Polytech Fed Lausanne CH-1015 Lausanne Switzerland Univ Lisbon Inst Super Tecn Dept Math P-1049001 Lisbon Portugal Univ Lisbon Inst Super Tecn CEMAT P-1049001 Lisbon Portugal Politecn Milan Dipartimento Matemat F Brioschi MOX Modeling & Sci Comp I-20133 Milan Italy Univ Pittsburgh Dept Bioengn Dept Mech Engn & Mat Sci Pittsburgh PA 15261 USA

This paper considers numerical simulations of fluid-structure interaction (FSI) problems in hemodynamics for idealized geometries of healthy cerebral arteries modeled by both nonlinear isotropic and anisotropic material constitutive laws. In particular, it focuses on an anisotropic model initially proposed for cerebral arteries to characterize the activation of collagen fibers at finite strains. In the current work, this constitutive model is implemented for the first time in the context of an FSI formulation. In this framework, we investigate the influence of the material model on the numerical results and, in the case of the anisotropic laws, the importance of the collagen fibers on the overall mechanical behavior of the tissue. With this aim, we compare our numerical results by analyzing fluid dynamic indicators, vessel wall displacement, Von Mises stress, and deformations of the collagen fibers. Specifically, for an anisotropic model with collagen fiber recruitment at finite strains, we highlight the progressive activation and deactivation processes of the fibrous component of the tissue throughout the wall thickness during the cardiac cycle. The inclusion of collagen recruitment is found to have a substantial impact on the intramural stress, which will in turn impact the biological response of the intramural cells. Hence, the methodology presented here will be particularly useful for studies of mechanobiological processes in the healthy and diseased vascular wall.

关键词： Material constitutive models Cerebral arterial tissue Hypereslatic isotropic laws Hyperelastic anisotropic laws fluid-structure interaction Numerical simulations

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fluid-structure interaction coupling CFD and FEA

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PROGRESS IN COMPUTATIONAL fluid DYNAMICS 2014年第1期14卷 57-64页

作者： Marriott, Douglas MSC Software Frimley GU16 7ER England

fluid-structure interaction (FSI) is becoming of high importance and influence to examine and understand difficult engineering problems. FSI is defined as the interaction between a moving or deforming structure with an internal or external fluid flow, where the change in boundary conditions in one aspect influences the other. The iteration method between computational fluid dynamics (CFD) for the fluid domain and finite element analysis (FEA) for the structural domain will be examined in further detail. The coupling method between CFD and FEA will be shown to have been verified on the HA145E flutter benchmark by Rodden and Johnson (1994). In this study, a coupling solution between the FEA solver *** and the open source CFD solver OpenFOAM was used to perform a rear spoiler test case. The problem focuses on the airflow over a simple deformable spoiler as air accelerates over it from initial rest.

关键词： fluid-structure interaction FSI computational fluid dynamics CFD finite element analysis FEA coupling Nastran OpenFOAM flexible structure

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fluid-structure interaction simulations of patient-specific aortic dissection

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2020年第5期19卷 1607-1628页

作者： Baeumler, Kathrin Vedula, Vijay Sailer, Anna M. Seo, Jongmin Chiu, Peter Mistelbauer, Gabriel Chan, Frandics P. Fischbein, Michael P. Marsden, Alison L. Fleischmann, Dominik Stanford Univ Dept Radiol 3D & Quantitat Imaging Lab Stanford CA 94305 USA Stanford Univ Dept Pediat Cardiol Stanford CA 94305 USA Stanford Univ Dept Cardiothorac Surg Stanford CA 94305 USA Univ Magdeburg Dept Simulat & Graph Magdeburg Germany Stanford Univ Dept Bioengn Stanford CA 94305 USA

Credible computational fluid dynamic (CFD) simulations of aortic dissection are challenging, because the defining parallel flow channels-the true and the false lumen-are separated from each other by a more or less mobile dissection membrane, which is made up of a delaminated portion of the elastic aortic wall. We present a comprehensive numerical framework for CFD simulations of aortic dissection, which captures the complex interplay between physiologic deformation, flow, pressures, and time-averaged wall shear stress (TAWSS) in a patient-specific model. Our numerical model includes (1) two-way fluid-structure interaction (FSI) to describe the dynamic deformation of the vessel wall and dissection flap;(2) prestress and (3) external tissue support of the structural domain to avoid unphysiologic dilation of the aortic wall and stretching of the dissection flap;(4) tethering of the aorta by intercostal and lumbar arteries to restrict translatory motion of the aorta;and a (5) independently defined elastic modulus for the dissection flap and the outer vessel wall to account for their different material properties. The patient-specific aortic geometry is derived from computed tomography angiography (CTA). Three-dimensional phase contrast magnetic resonance imaging (4D flow MRI) and the patient's blood pressure are used to inform physiologically realistic, patient-specific boundary conditions. Our simulations closely capture the cyclical deformation of the dissection membrane, with flow simulations in good agreement with 4D flow MRI. We demonstrate that decreasing flap stiffness from Eflap=800 kPa (a) increases the displacement of the dissection flap from 1.4 to 13.4 mm, (b) decreases the surface area of TAWSS by a factor of 2.3, (c) decreases the mean pressure difference between true lumen and false lumen by a factor of 0.63, and (d) decreases the true lumen flow rate by up to 20% in the abdominal aorta. We conclude that the mobility of the dissection flap substantially i

关键词： Aortic dissection Computational hemodynamics fluid-structure interaction Prestress Tissue support 4D flow MRI

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fluid-structure interaction BASED ON HPC MULTICODE COUPLING

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SIAM JOURNAL ON SCIENTIFIC COMPUTING 2018年第6期40卷 C677-C703页

作者： Cajas, J. C. Houzeaux, G. Vazquez, M. Garcia, M. Casoni, E. Calmet, H. Artigues, A. Borrell, R. Lehmkuhl, O. Pastrana, D. Yanez, D. J. Pons, R. Martorell, J. Barcelona Supercomp Ctr Barcelona 08034 Spain CSIC IIIA Bellaterra 08193 Spain Vortex Bladeless Madrid 28232 Spain Univ Llull IQS Sch Engn Barcelona 08017 Spain

The fluid-structure interaction (FSI) problem has received great attention in the last few years, mainly because it is present in many physical systems, industrial applications, and almost every biological system. In the parallel computational field, outstanding advances have been achieved for the individual components of the problem, allowing, for instance, simulations around complex geometries at very high Reynolds numbers or simulations of the contraction of a beating heart. However, it is not an easy task to combine the advances of both fields, given that they have followed development paths in a rather independent way, and also because physical and numerical instabilities arise when dealing with two highly nonlinear partial differential equations. Nonetheless, in the last few years great advances in the coupled FSI field have been achieved, recognizing the most challenging problems to tackle and enabling a new generation of numerical simulations in aerodynamics, biological systems, and complex industrial devices. Keeping in mind that efficient parallel codes for the individual components already exist, this paper presents a framework to build a massively parallel FSI solver in a multicode coupling partitioned approach, with strong focus in the parallel implementation aspects and the parallel performance of the resulting application. The problem is casted in an algebraic form, and the main points of interest are the parallel environment needed to be able to transfer data among the codes, the location of the exchange surface, and the exchange of information among the parallel applications. The proposed framework has been implemented in the HPC multiphysics code Alya, and the multicode coupling is carried out running separated instances of this code. Two coupling algorithms with different acceleration schemes are revised, and three representative cases of different areas of interest showing the reach of the proposed framework are solved. Good agreement with litera

关键词： fluid-structure interaction HPC multicode coupling

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fluid-structure interaction Model of a Percutaneous Aortic Valve: Comparison with an In Vitro Test and Feasibility Study in a Patient-Specific Case

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ANNALS OF BIOMEDICAL ENGINEERING 2016年第2期44卷 590-603页

作者： Wu, Wei Pott, Desiree Mazza, Beniamino Sironi, Tommaso Dordoni, Elena Chiastra, Claudio Petrini, Lorenza Pennati, Giancarlo Dubini, Gabriele Steinseifer, Ulrich Sonntag, Simon Kuetting, Maximilian Migliavacca, Francesco Politecn Milan Lab Biol Struct Mech Dept Chem Mat & Chem Engn Giulio Natta Piazza Leonardo Vinci 32 I-20133 Milan Italy Rhein Westfal TH Aachen Dept Cardiovasc Engn Inst Appl Med Engn Helmholtz Inst Aachen Germany Erasmus Univ Med Ctr Dept Biomed Engn Thoraxctr Rotterdam Netherlands Politecn Milan Dept Civil & Environm Engn I-20133 Milan Italy

Transcatheter aortic valve replacement (TAVR) represents an established recent technology in a high risk patient base. To better understand TAVR performance, a fluid-structure interaction (FSI) model of a self-expandable transcatheter aortic valve was proposed. After an in vitro durability experiment was done to test the valve, the FSI model was built to reproduce the experimental test. Lastly, the FSI model was used to simulate the virtual implant and performance in a patient-specific case. Results showed that the leaflet opening area during the cycle was similar to that of the in vitro test and the difference of the maximum leaflet opening between the two methodologies was of 0.42%. Furthermore, the FSI simulation quantified the pressure and velocity fields. The computed strain amplitudes in the stent frame showed that this distribution in the patient-specific case is highly affected by the aortic root anatomy, suggesting that the in vitro tests that follow standards might not be representative of the real behavior of the percutaneous valve. The patient-specific case also compared in vivo literature data on fast opening and closing characteristics of the aortic valve during systolic ejection. FSI simulations represent useful tools in determining design errors or optimization potentials before the fabrication of aortic valve prototypes and the performance of tests.

关键词： fluid-structure interaction Valve mechanics Mathematical models Stent Transcatheter aortic valve

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