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ASME Turbomachinery Technical Conference and Exposition (Turbo Expo) - Sustainable Energy - Accelerating the Transition by Advancing Turbine Technology

作者： Hollenbach, Richard Kielb, Robert Hall, Kenneth Duke Univ Durham NC 27708 USA

ISBN: (纸本)9780791884928

This paper expands upon a multi-degree-of-freedom, Van der Pol oscillator used to model buffet and Nonsynchronous Vibrations (NSV) in turbines. Two degrees-of-freedom are used, a fluid tracking variable incorporating a Van der Pol oscillator and a classic spring, mass, damper mounted cylinder variable;thus, this model is one of fluid-structure interaction. This model has been previously shown to exhibit the two main aspects of NSV. The first is the lock-in or entrainment phenomenon of the fluid shedding frequency jumping onto the natural frequency of the oscillator, while the second is a stable limit cycle oscillation (LCO) once the transient solution disappears. Improvements are made to the previous model to better understand this aeroelastic phenomenon. First, an error minimizing technique through a system identification method is used to tune the coefficients in the Reduced Order Model (ROM) to improve the accuracy in comparison to experimental data. Secondly, a cubic stiffness term is added to the fluid equation;this term is often seen in the Duffing Oscillator equation, which allows this ROM to capture the experimental behavior more accurately, seen in previous literature. The finalized model captures the experimental cylinder data found in literature much better than the previous model. These improvements also open the door for future models, such as that of a pitching airfoil or a turbomachinery blade, to create a preliminary design tool for studying NSV in turbomachinery.

关键词： Nonsynchronous Vibrations Van der Pol fluid-structure interaction Turbomachinery Reduced Order Model

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A peridynamics-immersed boundary-lattice Boltzmann method for fluid-structure interaction analysis

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OCEAN ENGINEERING 2022年 264卷

作者： Yang, Fei Gu, Xin Xia, Xiaozhou Zhang, Qing Hohai Univ Coll Mech & Mat Dept Engn Mech Nanjing 211100 Peoples R China

ABS T R A C T fluid-structure interaction problems (FSI) are ubiquitous in nature and industrial production. Numerical simu-lation has been taken as an effective method for fluid-structure interaction analysis. To accurately and efficiently simulate the deformation and fracture of structure induced by fluid-structure interactions, a novel PD-IB-LBM is proposed. Specifically, the structural deformation and fracture is described by the improved bond-based peri-dynamic (PD) model with an attenuation kernel function and surface effect correction, and the fluid flow is modeled by the lattice Boltzmann method (LBM), together with immersed boundary method (IBM) as a solid bridge to realize the bi-directional coupling at the fluid-solid interface. Therefore, the generation of body conformal mesh and mesh reconstruction are avoided, and the damage and fracture of structure and the movement of the fluid can be well described. In addition, the velocity correction of fluid and solid is achieved by solving a linear system of equations derived from IBM, which eliminates the trouble of iterative solution between fluid and solid for the traditional coupling method. The proposed model is validated through the simulation of flow past a circular cylinder, a rotating ring in a square fluid, and the fracture of the beam in a fluid tunnel. The simulation results show that the proposed PD-IB-LBM model and algorithm can effectively predict the discon-tinuous mechanical behaviors such as damage and crack propagation of structure under complex fluid motion.

关键词： fluid-structure interaction Peridynamics Lattice Boltzmann method Immersed boundary method

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Numerical methodology based on fluid-structure interaction to predict the residual stress distribution in glass tempering considering non-uniform cooling

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COMPUTERS & structureS 2022年 264卷 106757-106757页

作者： Iglesias, A. Martinez-Agirre, M. Torca, I Llavori, I Esnaola, J. A. Mondragon Unibertsitatea Engn Fac Struct Mech & Design Arrasate Mondragon Spain Mondragon Unibertsitatea Engn Fac Fluid Mech Arrasate Mondragon Spain

In this paper a novel numerical methodology for calculating non-uniform residual stress distributions during the glass tempering process is presented. Tempering techniques lead to non-uniform heat transfer rates causing residual stress inhomogeneities, which consequently have a direct impact on the structural behaviour of components. Nevertheless, most works in the literature do not consider the influence of local flow phenomena during thermal calculations, resulting in non-representative residual stress distributions. In this context, a novel generalised methodology based on a fluid-structure interaction one-way approach to sequentially couple the thermal and mechanical fields is presented. In this way, the unsteady and non-uniform heat transfer rate is coupled with the Narayanaswamy model to predict the non-homogeneous residual stress pattern. The obtained numerical results for the analysed impinging jet array case are in good agreement both quantitatively and qualitatively, exhibiting an average error below 10% with respect to previous experimental investigations. Finally, efforts are made to reduce the computational time. Therefore, the proposed methodology proves to be an efficient tool for understanding the underlying mechanisms and predicting the residual stress distributions during glass tempering. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Glass tempering Residual stresses Inhomogeneities Volumetric radiation

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Study on the Effect of Fracturing Pump Start and Stop on Tubing fluid-structure interaction Vibration in HPHT Wells via MOC

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ENERGIES 2022年第24期15卷 9291页

作者： Cui, Lu Qiao, Fanfan Li, Meng Xiao, Yiming Cheng, Jiarui Xian Shiyou Univ Xian Key Lab Wellbore Integr Evaluat Xian Peoples R China

The processes of HTHP well fracturing, oil drive, and gas recovery are accompanied by the non-stationary flow of medium in the tubing, which may lead to periodic vibration and cause the failure and fatigue of the tubing, thread leakage, and bending deformation. In this paper, a fluid-structure interaction model with 4-equation was established, which considered the unsteady flow of fluid and the motion state of tubing during the periodic injection, pump start, and shutdown of fluid in the tubing. Further, the discrete solution of MOC was used to obtain the variation of fluid flow rate and pressure, tubing vibration rate, frequency, and additional stress with time. The resonance construction parameters corresponding to different tubing diameters were analyzed by discussing the effects of different start and shutdown times as well as pressure on the tubing vibration parameters. The results show that under the periodic injection condition, increasing the tubing diameter or start inside pressure would lead to a sharp increase in the axial additional stress of the tubing generated by fluid-structure interaction, which is not conducive to the safety protection of the tubing. When the pump was shutdown, excessively short operation times and high pressure in the tubing would lead to excessive transient loads in addition to resonance, which would cause damage to the pipeline. Finally, corresponding to the above analysis results, this paper proposes the optimal injection parameters to avoid the generation of resonance, which provides a theoretical basis and reference range for the safe service conditions of the tubing.

关键词： tubing fluid-structure interaction method of characteristics (MOC) pump start and shutdown conditions resonance

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A fluid-structure interaction model accounting arterial vessels as a key part of the blood-flow engine for the analysis of cardiovascular diseases

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FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY 2022年 10卷 981187页

作者： Cheng, Heming Li, Gen Dai, Jifeng Zhang, Ke Xu, Tianrui Wei, Liuchuang Zhang, Xue Ding, Dongfang Hou, Jie Li, Jianyun Zhuang, Jiangping Tan, Kaijun Guo, Ran Kunming Univ Sci & Technol Dept Mech Kunming Peoples R China Kunming Univ Sci & Technol Fac Civil Engn & Mech Kunming Peoples R China Kunming Univ Sci & Technol Dept Hydraul Engn Kunming Peoples R China Kunming Univ Sci & Technol Fac Life Sci & Technol Kunming Peoples R China

According to the classical Windkessel model, the heart is the only power source for blood flow, while the arterial system is assumed to be an elastic chamber that acts as a channel and buffer for blood circulation. In this paper we show that in addition to the power provided by the heart for blood circulation, strain energy stored in deformed arterial vessels in vivo can be transformed into mechanical work to propel blood flow. A quantitative relationship between the strain energy increment and functional (systolic, diastolic, mean and pulse blood pressure) and structural (stiffness, diameter and wall thickness) parameters of the aorta is described. In addition, details of blood flow across the aorta remain unclear due to changes in functional and other physiological parameters. Based on the arterial strain energy and fluid-structure interaction theory, the relationship between physiological parameters and blood supply to organs was studied, and a corresponding mathematical model was developed. The findings provided a new understanding about blood-flow circulation, that is, cardiac output allows blood to enter the aorta at an initial rate, and then strain energy stored in the elastic arteries pushes blood toward distal organs and tissues. Organ blood supply is a key factor in cardio-cerebrovascular diseases (CCVD), which are caused by changes in blood supply in combination with multiple physiological parameters. Also, some physiological parameters are affected by changes in blood supply, and vice versa. The model can explain the pathophysiological mechanisms of chronic diseases such as CCVD and hypertension among others, and the results are in good agreement with epidemiological studies of CCVD.

关键词： cardio-cerebrovascular diseases strain energy arterial vessels physiological parameters blood supply fluid-structure interaction

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Semi-implicit fluid-structure interaction in biomedical applications

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 400卷

作者： Schussnig, Richard Pacheco, Douglas R. Q. Kaltenbacher, Manfred Fries, Thomas -Peter Graz Univ Technol Inst Struct Anal Lessingstr 25-11 A-8010 Graz Styria Austria Graz Univ Technol Graz Ctr Computat Engn Krenngasse 37-I A-8010 Graz Styria Austria Norwegian Univ Sci & Technol Dept Math Sci Alfred Getz vei 1 N-7034 Trondheim Trondelag Norway Graz Univ Technol Inst Fundamentals & Theory Elect Engn Inffeldgasse 18-I A-8010 Graz Styria Austria

fluid-structure interaction (FSI) incorporates effects of fluid flows on deformable solids and vice versa. Complex biomedical problems in clinical applications continue to challenge numerical algorithms, as incorporating the underlying mathematical methods can impair the solvers' performance drastically. In this regard, we extend a semi-implicit, pressure Poisson-based FSI scheme for non-Newtonian fluids to incorporate several models crucial for biomechanical applications. We consider Windkessel outlets to account for neglected downstream flow regions, realistic material fibre orientation and stressed reference geometries reconstructed from medical image data. Additionally, we incorporate vital numerical aspects, namely, stabilisations to counteract dominant convective effects and instabilities triggered by re-entrant flow, while a major contribution of this work is combining interface quasi-Newton methods with Robin coupling conditions to accelerate the partitioned (semi-)implicit coupling scheme. The numerical examples presented herein aim to finally bridge the gap to real-world applications, considering state-of-the-art modelling aspects and physiological parameters. FSI simulations of blood flow in an iliac bifurcation derived from medical images and vocal folds deforming in the process of human phonation demonstrate the versatility of the framework.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Semi-implicit coupling Fractional-step time-marching fluid-structure interaction Non-Newtonian fluid Patient-specific simulation Navier-Stokes equations

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Comparison of numerical methods for cerebrospinal fluid representation and fluid-structure interaction during transverse impact of a finite element spinal cord model

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2022年第3期38卷 e3570-e3570页

作者： Rycman, Aleksander McLachlin, Stewart Cronin, Duane S. Univ Waterloo Dept Mech & Mechatron Engn 200 Univ Ave West Waterloo ON N2L 3G1 Canada

Spinal cord impacts can have devastating consequences. Computational models can investigate such impacts but require biofidelic numerical representations of the neural tissues and fluid-structure interaction with cerebrospinal fluid. Achieving this biofidelity is challenging, particularly for efficient implementation of the cerebrospinal fluid in full computational human body models. The goal of this study was to assess the biofidelity and computational efficiency of fluid-structure interaction methods representing the cerebrospinal fluid interacting with the spinal cord, dura, and pia mater using experimental pellet impact test data from bovine spinal cords. Building on an existing finite element model of the spinal cord and pia mater, an orthotropic hyperelastic constitutive model was proposed for the dura mater and fit to literature data. The dura mater and cerebrospinal fluid were integrated with the existing finite element model to assess four fluid-structure interaction methods under transverse impact: Lagrange, pressurized volume, smoothed particle hydrodynamics, and arbitrary Lagrangian-Eulerian. The Lagrange method resulted in an overly stiff mechanical response, whereas the pressurized volume method over-predicted compression of the neural tissues. Both the smoothed particle hydrodynamics and arbitrary Lagrangian-Eulerian methods were able to effectively model the impact response of the pellet on the dura mater, outflow of the cerebrospinal fluid, and compression of the spinal cord;however, the arbitrary Lagrangian-Eulerian compute time was approximately five times higher than smoothed particle hydrodynamics. Crucial to implementation in human body models, the smoothed particle hydrodynamics method provided a computationally efficient and representative approach to model spinal cord fluid-structure interaction during transverse impact.

关键词： cerebrospinal fluid finite element model fluid-structure interaction human body model impact spinal cord

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Water Hammer and Harmonic Excitation Response With fluid-structure interaction in Elbow Piping

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JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME 2022年第3期144卷 031401-031401页

作者： Oinonen, Ahti VTT Tech Res Ctr Finland Ltd Kemistintie 3 FI-02044 Espoo Finland

This study focuses on the numerical analysis of a piping structure subjected to the water-hammer event caused by a rapid valve closure that is combined with external harmonic loading representing an idealized machine excitation. The fluid-structure interaction procedure applied to solutions involves the method of characteristic for the fluid equations with the finite element method for pipe structures, which are modeled as beams. Junction coupling at the pipe elbow governs the two-way coupled fluid-structure interaction, and both the friction and Poisson couplings are incorporated as well. There is an application on a piping structure that consists of a valve, tank, and elbow that are defined as boundary conditions. The solved result quantities include pressure and bending stress responses as well as dynamic displacement modes of the piping structure. Comparisons of the results show that water hammer loading combined with the mechanical excitation load induces significantly increased displacements and higher stress peaks when frequencies of the harmonic load and the acoustic natural mode of the piping system coincide. Additionally, the resulting mode of lateral structural vibration of the piping member closely resembles an analytically solved eigenmode of the beam. The conclusion is that dynamically changing flows due to a water hammer event can solely excite natural frequencies of the piping structure causing resonance in the system.

关键词： acoustic excitation fluid-structure interaction piping dynamics water hammer response

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Time-periodic steady-state solution of fluid-structure interaction and cardiac flow problems through multigrid-reduction-in-time

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 389卷 114368-114368页

作者： Hessenthaler, Andreas Falgout, Robert D. Schroder, Jacob B. de Vecchi, Adelaide Nordsletten, David Roehrle, Oliver Univ Stuttgart Inst Modelling & Simulat Biomech Syst Pfaffenwaldring 5a D-70569 Stuttgart Germany Univ Stuttgart Stuttgart Ctr Simulat Technol Pfaffenwaldring 5a D-70569 Stuttgart Germany Lawrence Livermore Natl Lab Ctr Appl Sci Comp Livermore CA 94551 USA Univ New Mexico Dept Math & Stat Albuquerque NM 87131 USA Kings Coll London Sch Biomed Engn & Imaging Sci St Thomas Hosp 4th FL Rayne Inst London SE1 7EH England Univ Michigan Dept Biomed Engn & Cardiac Surg NCRC B202800 Plymouth Rd Ann Arbor MI 48109 USA

In this paper, a time-periodic MGRIT algorithm is proposed as a means to reduce the time-to-solution of numerical algorithms by exploiting the time periodicity inherent to many applications in science and engineering. The time-periodic MGRIT algorithm is applied to a variety of linear and nonlinear single-and multiphysics problems that are periodic-in-time. It is demonstrated that the proposed parallel-in-time algorithm can obtain the same time-periodic steady-state solution as sequential time-stepping. It is shown that the required number of MGRIT iterations can be estimated a priori and that the new MGRIT variant can significantly and consistently reduce the time-to-solution compared to sequential time-stepping, irrespective of the number of dimensions, linear or nonlinear PDE models, single-physics or coupled problems and the employed computing resources. The numerical experiments demonstrate that the time-periodic MGRIT algorithm enables a greater level of parallelism yielding faster turnaround, and thus, facilitating more complex and more realistic problems to be solved. (c) 2021 Elsevier B.V. All rights reserved.

关键词： Time-periodic parallel-in-time solver Multigrid-reduction-in-time (MGRIT) Speedup fluid-structure interaction Analytic Solutions Cardiac flow

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Simulation of fluid and shear stress behaviors in reciprocating membrane bioreactors for fouling control using fluid-structure interaction analysis

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SEPARATION AND PURIFICATION TECHNOLOGY 2022年 294卷

作者： Jang, Yongsun Ryoo, Hwa-Soo Shin, Yong-Cheol Park, Hee-deung Korea Univ Dept Civil Environm & Architectural Engn Seoul 02841 South Korea HIFILTEC Yongin 17038 Gyonggi South Korea Korea Univ KU KIST Grad Sch Converging Sci & Technol Seoul 02841 South Korea Korea Univ Sch Civil Environm & Architectural Engn 145 Anam ro Seoul 02841 South Korea

In this study, fluid-structure interaction simulations of a reciprocating membrane bioreactor were performed under various conditions. The reactor and membrane module were configured in a reactor-scale. The shear stress on the tensioned membrane is governed by the fluids it repels. With reciprocating speeds of 10, 20, and 30 cm/s, the maximum shear stresses within one cycle were 3.03, 3.74, and 1.14 N/m(2), respectively. Excessively high speed prevented the fluid from accelerating and dispersing, resulting in a low shear stress. For triangle, sine, and square motions, the maximum shear stresses were 0.92, 3.74 and 4.36 N/m(2), respectively. This suggests that both acceleration and deceleration in motion are critical for generating high shear stress. When the slack increased from 0 to 0.5 and 1%, the maximum shear stress decreased from 3.74 to 2.11 and 1.2 N/m(2), respectively, owing to the decrease in membrane tension. The results of this study should be considered when attempting to increase fouling removal effects reciprocating membrane bioreactor.

关键词： Membrane bioreactor Membrane fouling Reciprocation fluid-structure interaction Simulation

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