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Numerical Study of the fluid-structure interaction During CNT-Water Nanofluid Mixed Convection in a Micro-Channel Equipped with Elastic Fins Under Periodic Inlet Velocity Conditions

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EXPERIMENTAL TECHNIQUES 2023年第1期47卷 7-15页

作者： Ben Said, L. Kolsi, L. Ben Khedher, N. Alshammari, F. Malekshah, E. H. Hussein, A. K. Hail Univ Coll Engn Mech Engn Dept Hail Saudi Arabia Univ Sfax Natl Engn Sch Sfax Lab Electromech Syst LASEM Sfax 3038 Tunisia Univ Monastir Natl Engn Sch Lab Metrol & Energy Syst Monastir Tunisia Univ Monastir Lab Thermal & Energet Syst Studies Natl Sch Engn Monastir Monastir Tunisia Silesian Tech Univ Dept Power Engn & Turbomachinery PL-44100 Gliwice Poland Univ Babylon Coll Engn Mech Engn Dept Babylon Hilla Iraq

The present paper presents a numerical investigation treating the fluid-structure interaction during CNT-water nanofluid mixed convection in a micro-channel equipped with elastic fins. A numerical framework for simulating the fluid-structure interaction is proposed by using the Finite Element Method (FEM) in COMSOL Multiphysics. To prepare the numerical model, the micro-channel boundaries are considered as rigid, and the fins are elastic. Under periodic fully developed inlet boundary condition the effects of CNT volume fraction and the average inlet velocity on the flow structure, temperature field, heat transfer, drag and lift coefficients are studied. Results highlight the major effect of the fin oscillations to reduce the lift and drag forces and to improve the heat transfer and cooling the outlet flow from the cylindrical micro-channel. The dispersion of CNT nanoparticles in water-based fluid enhances considerably the convection process. In fact, it is remarked that due to the high thermal conductivity of CNT-water nanofluid the Nusselt number increases for higher CNT concentration especially for higher inlet velocities.

关键词： CFD-analysis micro-channel Mixed convection fluid-structure interaction CNT-nanofluid

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Recent progress of lattice Boltzmann method and its applications in fluid-structure interaction

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2023年第11期237卷 2461-2484页

作者： Wang, Li Liu, Zhengliang Rajamuni, Methma Univ New South Wales Sch Engn & Informat Technol Canberra ACT Australia Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen Peoples R China

fluid-structure interaction (FSI) is a very common physical phenomenon which extensively exists in nature, human daily life and many engineering applications. The lattice Boltzmann method (LBM) is an alternative of solving Navier-Stokes equations to obtain complex fluid dynamics. Since the proposal of lattice Bhatnagar-Gross-Krookmodel, the LBM has been improved and applied to various complex flows ranging from laminar flow to turbulent flow and Newtonian flow to non-Newtonian flow. To handle the associated FSI, the bounce-back scheme was proposed and then the immersed boundary method (IBM) was incorporated into the LBM for the simplicity and robustness of IBM in handling complex and moving geometries and the significant efficiency of LBM in solving fluid dynamics. In recent years, the combined frameworks of LBM, that is, bounce-back-lattice Boltzmann method and immersed boundary-lattice Boltzmann method have witnessed a significant development and the successful applications can be found in a range of physical problems such as flow around bluff bodies, flapping wings, wind turbines, aeroacoustics, sea wave modelling and et al. In this paper, the recent progress of LBM and some typical applications involving FSI are reviewed.

关键词： Lattice Boltzmann method complex flow fluid-structure interaction

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Two-way fluid-structure interaction for longitudinal vibration of a loaded elastic rod within a multiphase fluid flow

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JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2023年第11期45卷 1-17页

作者： Tarmigh, Mehrnoosh Behbahani-Nejad, Morteza Hajidavalloo, Ebrahim Shahid Chamran Univ Ahvaz Fac Engn Dept Mech Engn Ahvaz *** Iran

This paper presents a novel approach for simulating the interaction of long elastic rod strings and the corresponding fluid flow around in sucker rod pump systems. The governing equations of transient multiphase fluid flow are coupled with those of the rod string deformation to improve the numerical analysis of sucker rod pump behavior. For the first time, the transient water-oil-gas multiphase fluid flow containing dissolved gas is related to the rod cyclic loads by the proposed numerical simulation. The derived mathematical model incorporates the dynamics of the rod string and the multiphase fluid flow. Downhole loading of the rod is applied based on the transient pressures of the moving gas-liquid flow in the annular space and the barrel under the plunger, considering different modes of pump operation. A two-way algorithm, for fluid and solid zones, is developed to enhance the performance of the current simulation, and to reduce the complexity of solving process. Several test cases have been analyzed using the proposed simulation method. The obtained results show a good agreement when they are compared and validated with the available numerical and experimental results.

关键词： fluid-structure interaction Elastic rod Multiphase fluid Rod pump Gas-liquid flow

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Computational fluid-structure interaction Analysis of Piston Pin Multiphase Elastohydrodynamic Lubrication With Unsteady Flow Channel Variation

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JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 2023年第2期145卷 021603页

作者： Narumi, Yudai Ishimoto, Jun Kanayama, Daisuke Kuribara, Hiroshi Nakano, Yoshikatsu Toyota Motor Co Ltd 1 Toyota Cho Toyota Aichi 4718571 Japan Tohoku Univ Inst Fluid Sci Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan Honda Motor Co Ltd 3-15-1 Sensui Asaka Saitama 3518555 Japan

This research focuses on the multiphase oil film tribology between the piston pin and the connecting rod in an internal combustion engine and establishes a new computational approach for thin-film lubrication with unsteady flow channel variation. First, the pin and the connecting rod are considered as rigid bodies, and 3D numerical analysis of the cavitating lubricating oil flow is performed when combustion load is applied to the pin. We find that dynamic pressure does not increase around the connecting rod edge and that pressure is potentially insufficient to support the load. In the second numerical analysis, the pin and the connecting rod are considered to be elastically deformable structures, and coupled 3D multiphase fluid-structure interaction simulation is performed. The boundary lubrication area is detected using a statistical Greenwood-Tripp model as unevenness of the contacted metal surface. The results show that pressure distribution spreads more widely than in the result for rigid bodies and that the film was thicker as well. Also, the pin deformed like a bow, but the deformation of the connecting rod was quite small, suggesting a potential mechanical contact at the edge of the connecting rod with the pin. By comparison with an actual operationally used piston pin, we find that the fluid-structure coupled analysis qualitatively predicted the seizure location.

关键词： elastohydrodynamic lubrication fluid-structure interaction cavitation asperity contact coupled computing cavitation fluid film lubrication hydrodynamic lubrication surface roughness and asperities thermoelastohydrodynamic lubrication viscosity

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A fluid-structure interaction Tool Using a Van der Pol-Based Reduced-Order Model for Buffet and Nonsynchronous Vibrations

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JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME 2023年第1期145卷 011009页

作者： Hollenbach, Richard Kielb, Robert Hall, Kenneth Duke Univ Pratt Sch Engn Thomas Lord Dept Mech Engn Durham NC 27703 USA Duke Univ Pratt Sch Engn Thomas Lord Dept Mech Engn Durham NC 27708 USA

This paper builds upon a two-degree-of-freedom Van der Pol oscillator-based reduced-order model for studying the mechanisms around nonsynchronous vibrations (NSV) in turbomachinery. One degree tracks the fluid motion utilizing a combination of a traditional Van der Pol oscillator and a Duffing oscillator;the other degree of freedom is a mass on a spring and a damper, in this case, a cylinder. Thus, this model can be considered one of fluid-structure interaction. The cubic stiffening from the Duffing oscillator proved to improve the match to experimental data. Using this model to study the time history of the fluid and the structure oscillation, additional parameters are extracted to understand the underlying mechanisms of frequency lock-in and limit cycle oscillation. First, the phase shift between the vortex shedding and the structural motion is calculated when it locks-in and then unlocks. Second, the work done per cycle is analyzed from the contributions of the mass, spring, and damping forces to determine the dominant contributor when locking-in versus unlocking. Third, the phase portrait is plotted on a Poincare map to further study the locked-in versus unlocked responses. This model is then validated against not only experimental data but also computational simulation results and previous reduced-order models. The finalized model can now serve as a preliminary design tool for turbomachinery applications. For more realistic and accurate modeling, the third degree of freedom in the form of an airfoil pitching motion will be added in a separate paper as well.

关键词： nonsynchronous vibrations Van der Pol fluid-structure interaction reduced order model computational fluid dynamics (CFD) fan compressor turbine aerodynamic design

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Onset and nature of flow-induced vibrations in cerebral aneurysms via fluid-structure interaction simulations

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2023年第3期22卷 761-771页

作者： Bruneau, David A. Valen-Sendstad, Kristian Steinman, David A. Univ Toronto Dept Mech & Ind Engn Toronto ON Canada Simula Res Lab Dept Computat Physiol Oslo Norway

Clinical, experimental, and recent computational studies have demonstrated the presence of wall vibrations in cerebral aneurysms, thought to be induced by blood flow instability. These vibrations could induce irregular, high-rate deformation of the aneurysm wall, and potentially disrupt regular cell behavior and promote deleterious wall remodeling. In order to elucidate, for the first time, the onset and nature of such flow-induced vibrations, in this study we imposed a linearly increasing flow rate on high-fidelity fluid-structure interaction models of three anatomically realistic aneurysm geometries. Prominent narrow-band vibrations in the range of 100-500 Hz were found in two out of the three aneurysm geometries tested, while the case that did not exhibit flow instability did not vibrate. Aneurysm vibrations consisted mostly of fundamental modes of the entire aneurysm sac, with the vibrations exhibiting more frequency content at higher frequencies than the flow instabilities driving those vibrations. The largest vibrations occurred in the case which exhibited strongly banded fluid frequency content, and the vibration amplitude was highest when the strongest fluid frequency band was an integer multiple of one of the natural frequencies of the aneurysm sac. Lower levels of vibration occurred in the case which exhibited turbulent-like flow with no distinct frequency bands. The current study provides a plausible mechanistic explanation for the high-frequency sounds observed in cerebral aneurysms, and suggests that narrow-band (vortex-shedding type) flow might stimulate the wall more, or at least at lower flow rates, than broad-band, turbulent-like flow.

关键词： Aneurysm Biological vibration High-frequency wall motion fluid-structure interaction Flow instability Spectral analysis Hemodynamics

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Projection Based Semi-Implicit Partitioned Reduced Basis Method for fluid-structure interaction Problems

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JOURNAL OF SCIENTIFIC COMPUTING 2023年第1期94卷 1-41页

作者： Nonino, Monica Ballarin, Francesco Rozza, Gianluigi Maday, Yvon Univ Vienna Dept Math Oskar Morgenstern Pl A-1090 Vienna Austria Univ Cattolica Sacro Cuore Dipartimento Matemat & Fis Via Garzetta I-25133 Brescia Italy Scuola Int Super Studi Avanzati MathLab Via Bonomea I-34136 Trieste Italy Univ Paris 06 Lab Jacques Louis Lions Pl Jussieu F-75005 Paris France

In this manuscript a POD-Galerkin based Reduced Order Model for unsteady fluid-structure interaction problems is presented. The model is based on a partitioned algorithm, with semi-implicit treatment of the coupling conditions. A Chorin-Temam projection scheme is applied to the incompressible Navier-Stokes problem, and a Robin coupling condition is used for the coupling between the fluid and the solid. The coupled problem is based on an Arbitrary Lagrangian Eulerian formulation, and the Proper Orthogonal Decomposition procedure is used for the generation of the reduced basis. We extend existing works on a segregated Reduced Order Model for fluid-structure interaction to unsteady problems that couple an incompressible, Newtonian fluid with a linear elastic solid, in two spatial dimensions. We consider three test cases to assess the overall capabilities of the method: an unsteady, non-parametrized problem, a problem that presents a geometrical parametrization of the solid domain, and finally, a problem where a parametrization of the solid's shear modulus is taken into account.

关键词： fluid-structure interaction Reduced basis method Segregated algorithm Proper orthogonal decomposition Incompressible fluid Elastic solid

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Study of flow field and vibration characteristics of supersonic centrifugal impellers based on fluid-structure interaction

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2023年第7期33卷 2509-2532页

作者： Li, Huanjun Zhang, Yimin Hangzhou Dianzi Univ Dept Mech Engn Hangzhou Peoples R China

PurposeThere are three purposes in this paper: to verify the importance of bi-directional fluid-structure interaction algorithm for centrifugal impeller designs;to study the relationship between the flow inside the impeller and the vibration of the blade;study the influence of material properties on flow field and vibration of centrifugal blades. Design/methodology/approachFirst, a bi-directional fluid-structure coupling finite element numerical model of the supersonic semi-open centrifugal impeller is established based on the Workbench platform. Then, the calculation results of impeller polytropic efficiency and stage total pressure ratio are compared with the experimental results from the available literature. Finally, the flow field and vibrational characteristics of 17-4PH (PHB), aluminum alloy (AAL) and carbon fiber-reinforced plastic (CFP) blades are compared under different operating conditions. FindingsThe results show that the flow fields performance and blade vibration influence each other. The flow fields performance and vibration resistance of CFP blades are higher than those of 17-4PH (PHB) and aluminum alloy (AAL) blades. At the design speed, compared with the PHB blades and AAL blades, the CFP blades deformation is reduced by 34.5% and 9%, the stress is reduced by 69.6% and 20% and the impeller pressure ratio is increased by 0.8% and 0.14%, respectively. Originality/valueThe importance of fluid-structure interaction to the aerodynamic and structural design of centrifugal impeller is revealed, and the superiority over composite materials in the application of centrifugal impeller is verified.

关键词： Flow field Vibration Supersonic centrifugal impeller fluid-structure interaction CFD

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The internal substructure method for shock wave input in 2D fluid-structure interaction analysis with unbounded domain using doubly-asymptotic ABC

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MECHANICS OF ADVANCED MATERIALS AND structureS 2023年第15期30卷 3111-3124页

作者： Wang, Piguang Lu, Ranran Yan, Qiushi Bao, Xin Zhang, Junqi Liu, Lei Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing 100124 Peoples R China Tsinghua Univ Sch Civil Engn Beijing Peoples R China Pells Sullivan Meynink Engn Consultants N Ryde NSW Australia

interaction between underwater shock waves and structures has attracted significant interest of many researchers. This study aims to develop a method to solve two-dimensional (2 D) fluid-structure interaction problems during far-field underwater explosion (UNDEX). The acoustic domain which can undergo small pressure variations is considered to describe the fluid-structure interaction during UNDEX. First, the empirical formula of the incident shock waves is considered as free wave motion of the fluid, and the fluid domain is Discretized by the finite element method. Based on the scaled boundary finite element method (SBFEM) and continued fraction solution, an artificial boundary condition (ABC) with high accuracy in time domain is adopted to simulate the truncated infinite domain, which can be placed very close to the radiating field is adopted to simulate the truncated infinite domain. Third, an internal substructure method (ISM) to calculate the equivalent input shock wave loads is proposed. Finally, the proposed method is used to study the scattered waves on a rigid circular structure due to the shock wave, and the effect of the radiation wave due to the motion of the structure on the dynamic responses of the circular structure during UNDEX is studied.

关键词： Artificial boundary condition equivalent shock wave input fluid-structure interaction internal substructure underwater explosive

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STUDY ON VIBRATION AND THERMAL EXPANSION OF HEATING FURNACE MANIFOLD BASED ON fluid-structure interaction METHOD

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HEAT TRANSFER RESEARCH 2023年第10期54卷 19-36页

作者： Zhang, Jinya Tan, Zheng Hu, Wei Wang, Ke Zhang, Yongxue China Univ Petr Coll Mech & Transportat Engn 18 Fuxue Rd Beijing 102249 Peoples R China

In the petrochemical industry, the manifolds are usually adopted as the distributor of the heating furnace. The structure of the manifold plays a crucial role in the safe operation of the heating furnace. For the straight tube structure and fishbone structure of the manifold, thermal expansion calculation was carried out in this paper. The expansion amount of each branch pipe was obtained, and the maximum expansion amount of the branch pipe was 91.8% of the reserved size. The accuracy of the design of the branch pipe wall clearance allowance was verified. Numerical simulations of the fluid-structure interaction were carried out for both structures, which showed that the two structures have similar deformation and frequency in terms of overall structural vibration. However, in the branch vibration, the stress and vibration frequency of the fishbone branch increase by 12.6% and 25.3%, respectively, compared to the straight tube branch, which is caused by the presence of large vortices in the branch of the fishbone structure. Finally, modal analyses were performed for both structures, and the results can be used to estimate whether the vibration frequencies of the two structures avoid the natural frequencies.

关键词： heating furnace manifold fluid-structure interaction vibration

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