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Application of response surface optimization technology and fluid-structure interaction in the engineering design of torsional flow heat exchangers

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2022年第12期236卷 6607-6620页

作者： Gu, Xin Wang, Guan Li, Ning Chen, Cheng Zhang, Qianxin Zhengzhou Univ Sch Mech & Power Engn Zhengzhou Peoples R China Zhengzhou Univ Key Lab Proc Heat Transfer & Energy Saving Henan Zhengzhou Peoples R China

Shell and tube heat exchanger is an important part of industrial heating and cooling system. Because of the harsh operating conditions, and its complex fin and baffle structure with numerous holes, it is a great challenge for engineers to design and evaluate the baffle structure on the premise of ensuring the comprehensive performance. This paper aims to provide a method to optimize the baffle structure of torsional flow heat exchanger by comprehensively considering thermal, hydraulic, and mechanical properties. Based on fluid-structure interaction method, response surface methodology was applied to improve the structure configurations of torsional flow heat exchanger. The results show that the effects of various input parameters on objectives are related to each other, and the baffle width and inclination angle have a more obvious impact on heat exchanger. The tradeoff analysis is carried out for the optimization objectives, the candidate points obtained by optimization reveal that the fluid comprehensive performance of the optimal structure is increased by 10.99%, and the maximum equivalent stress is reduced by 8.74%. The research results offer theoretical guidance for the equipment maintenance and structural design of torsional flow heat exchanger.

关键词： Design of experiment torsional flow heat exchanger fluid-structure interaction structural parameters Laser Doppler velocimeter response surface

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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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fluid-structure interaction simulation for performance prediction and design optimization of parafoils

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ENGINEERING APPLICATIONS OF COMPUTATIONAL fluid MECHANICS 2023年第1期17卷

作者： Zhu, Hong Sun, Qinglin Tao, Jin Sun, Hao Chen, Zengqiang Zeng, Xianyi Soulat, Damien Nankai Univ Coll Artificial Intelligence Tianjin 300350 Peoples R China Univ Lille ENSAIT Lab Genie & Mat Text GEMTEX Roubaix France

Parachute design is challenging to achieve innovative progress if the dominant role of testing continues, as it will be an increasingly expensive and time-consuming work. The aim of this study is to establish a reliable and efficient design tool using existing advanced numerical modeling methods. This paper presents a numerical method based on two-way coupled fluid-structure interaction (FSI) strategies for predicting aerodynamic and flight performance for parafoil design optimization. The nonlinear finite element method was used for the canopy fabric model and flow field, and the fluid dynamics were solved by Reynolds-averaged Navier-Stokes with the Spalart-Allmaras turbulence model. The FSI simulations are performed to assess the aerodynamic performance and structural deformations of full-scale parafoil canopies. The equilibrium shape of the parafoil canopy under steady gliding states and the relevant flow field were analyzed to enhance confidence and understanding in the performance prediction of new parachutes. Three-dimensional FSI simulation results of parafoils show that the inflation caused flexible bulges of canopy cells, and the maximum lift coefficient increased more than 16% with a higher stall angle of attack than that of the rigid body model. A parafoil with a smaller leading edge inlet or a scaling down area can improve the aerodynamic performance, mainly manifested in a higher lift-to-drag ratio and better anti-stall performance. Finally, the prediction results of parafoil glide performance were verified by flight test data, and the prediction accuracy of the flexible model is more than 10% higher than that of the rigid model. This work makes the simulation tools a step closer to practical application.

关键词： fluid-structure interaction parafoil design aerodynamic characteristics performance prediction flexible deformation inflation

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An implicit SPH-based structure model for accurate fluid-structure interaction simulations with hourglass control scheme

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EUROPEAN JOURNAL OF MECHANICS B-fluidS 2022年 96卷 122-145页

作者： Shimizu, Yuma Khayyer, Abbas Gotoh, Hitoshi Kyoto Univ Dept Civil & Earth Resources Engn Kyoto Japan

This work is dedicated to development of an implicit SPH (Smoothed Particle Hydrodynamics)-based structure model as well as its integrated purely Lagrangian meshfree hydroelastic FSI (fluid-structure interaction) solver for consistent, accurate and stable modeling of FSI problems. The implicit structure model is established in the context of Hamiltonian mechanics under the assumption of linear elastic solid. Four refined schemes are introduced for improved accuracy, consistency, efficiency and stability: two formerly developed schemes, HT (High-order implicit Time integration) scheme, [ii] HD (High -order Discretization) operator scheme;as well as the novel two schemes newly proposed in this work, namely [iii] IPC (Iterative Predictor-Corrector) calculation procedures to minimize errors related to an imprecise assumption on rotation matrix and [iv] IHC (Implicit Hourglass Control) scheme for stabilizing simulation by suppressing spurious zero-energy modes. An enhanced particle-based FSI solver is formulated within a unified SPH framework by integrating a refined ISPH (Incompressible SPH) fluid model and the proposed implicit structure model, which allows consistent fluid-structure time coupling adopting the equivalent time step sizes in both phases. The proposed implicit structure model and FSI solver are configured in two-dimensions and validated with several 2D structure and FSI benchmark tests showing that our proposed implicit framework could provide almost consistent robustness, accuracy and efficiency with respect to the explicit one. (C) 2022 Elsevier Masson SAS. All rights reserved.

关键词： Smoothed Particle Hydrodynamics Implicit structure model Hourglass control fluid-structure interaction

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Effect of plaque compositions on fractional flow reserve in a fluid-structure interaction analysis

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2022年第1期21卷 203-220页

作者： Wu, Chulin Liu, Xiujian Ghista, Dhanjoo Yin, Youbin Zhang, Heye Sun Yat Sen Univ Sch Biomed Engn Shenzhen 518107 Peoples R China Univ 2020 Fdn Northborough MA 01532 USA Shenzhen Keya Med Technol Corp Shenzhen 518172 Peoples R China

Coronary artery disease involves the reduction of blood flow to the myocardium due to atherosclerotic plaques. The findings of myocardial ischemia may indicate severe coronary stenosis, but many studies have demonstrated a mismatch between lumen stenosis and fractional flow reserve (FFR). Recently, some clinical studies have found that the composition of atherosclerotic plaques may be a potential missing link between stenosis and ischemia. To investigate the relationship between myocardial ischemia and plaque composition, we have developed and adopted a new fluid-structure interaction (FSI) patient-specific coronary plaque model, based on computed tomography angiography data, to assess the impact on FFR as a biomechanical indicator of ischemia. A total of 180 analyses have been performed in 3D-FSI coronary artery disease models based on plaque compositions, plaque location, and stenosis degree. Hemodynamic analysis of simulation results and comparisons with other methods has been conducted to validate our models. Our results have successfully verified that the different compositions of plaques have resulted in differences in the calculated FFR. The mean FFR values with lipid plaques are (0.727 +/- 0.109) as compared to the mean FFR values in lesions with fibrous plaques (0.695 +/- 0.115, P = 0.019) and calcified plaques (0.682 +/- 0.115, P < 0.001). Besides, FFR differences between the three different plaque compositions have been shown to increase as the diameter stenosis increased. Plaque composition affects vascular stiffness and vascular dilation ability, and thereby affects the stenosis degree, resulting in abnormal FFR leading to myocardial ischemia. This interrelationship can help to diagnose the cause of high-risk coronary artery disease, leading to myocardial ischemia.

关键词： Plaque compositions Coronary stenosis Fractional flow reserve fluid-structure interaction Coronary atherosclerosis Myocardial ischemia Stenosis diameter

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Nonlinear flow control mechanism of two flexible flaps with fluid-structure interaction

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Acta Mechanica Sinica 2025年第2期41卷 116-131页

作者： Jiakun Han Chao Dong Jian Zhang Gang Chen College of Science Xi’an University of Science and TechnologyXi’an 710054China Beijing Institute of Space Long March Vehicle Beijing 100076China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China State Key Laboratory of Strength and Vibration for Mechanic Structures Shaanxi Key Laboratory of Service Environment and Control for Flight VehiclesSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China

The flow control at low Reynolds numbers is one of the most promising technologies in the field of aerodynamics,and it is also an important source of the innovation for novel *** this study,a new way of nonlinear flow control by interaction between two flexible flaps is proposed,and their flow control mechanism is studied employing the self-constructed immersed boundary-lattice Boltzmann-finite element method(IB-LB-FEM).The effects of the difference in material properties and flap length between the two flexible flaps on the nonlinear flow control of the airfoil are *** is suggested that the relationship between the deformation of the two flexible flaps and the evolution of the vortex under the fluid-structure interaction(FSI).It is shown that the upstream flexible flap plays a key role in the flow control of the two flexible *** FSI effect of the upstream flexible flap will change the unsteady flow behind it and affect the deformation of the downstream flexible *** flexible flaps with different material properties and different lengths will change their own FSI characteristics by the induced vortex,effectively suppressing the flow separation on the airfoil’s upper *** interaction of two flexible flaps plays an extremely important role in improving the autonomy and adjustability of flow *** numerical results will provide a theoretical basis and technical guidance for the development and application of a new flap passive control technology.

关键词： Nonlinear flow control Flexible flap fluid-structure interaction Flow separation IB-LB-FEM

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Variational Approach to fluid-structure interaction via GENERIC

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JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS 2022年第2期47卷 217-226页

作者： Peschka, Dirk Zafferi, Andrea Heltai, Luca Thomas, Marita Weierstrass Inst Appl Anal & Stochast Berlin Germany Scuola Int Super Avanzati Trieste Italy

We present a framework to systematically derive variational formulations for fluid-structure interaction problems based on thermodynamical driving functionals and geometric structures in different coordinate systems by suitable transformations within this formulation. Our approach provides a promising basis to construct structure-preserving discretization strategies.

关键词： fluid-structure interaction damped Hamiltonian system transformations

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Numerical Simulation for Vortex-Induced Vibration (VIV) of a High-Rise Building Based on Two-Way Coupled fluid-structure interaction Method

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2022年第3N04期22卷

作者： Yan, Bowen Ren, Hongyu Li, Dalong Yuan, Yangjin Li, Ke Yang, Qingshan Deng, Xiaowei Chongqing Univ Sch Civil Engn Chongqing Key Lab Wind Engn & Wind Energy Utiliza Chongqing 400045 Peoples R China Univ Hong Kong Dept Civil Engn Pokfulam Hong Kong Peoples R China

The vortex shedding phenomenon caused by flow separation at windward corners of a high-rise building would lead to significant vortex-induced vibrations (VIVs). This paper proposes a novel and efficient two-way coupled fluid-structure interaction (FSI) method named as equivalent lumped mass system (ELMS) method to study the wind-induced responses of the Common Advisory Aeronautical Council (CAARC) building. The numerical results of ELMS are validated based on available data of aeroelastic tests. To verify the computational efficiency of ELMS method, this study also employs the other two two-way coupled FSI methods (free-form deformation (FFD) method and mapping interpolation algorithms in system coupling (MIASC) method) to simulate the response of the same high-rise building. Furthermore, the VIV mechanisms of the high-rise building are explicitly discussed based on the numerical results of the ELMS method combined with large eddy simulation (LES). The outcomes show that the ELMS method could well capture the significant amplification of cross-wind response and "lock-in" phenomenon at the range of the critical wind speed. Moreover, the computational efficiency of the ELMS method is much improved compared with the other two FSI methods. The spatial correlation and spectral coherence of the local loads at different heights of the building are increased significantly at the "lock-in" stage. The findings in this study would facility the comprehensive understanding of the VIV phenomena of the high-rise building and provide an efficient two-way coupled FSI method for engineers and researchers involved in the wind-resistant design of slender tall buildings.

关键词： fluid-structure interaction vortex-induced vibration high-rise building large-eddy simulation aerodynamic instability

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Model-Based fluid-structure interaction Approach for Evaluation of Thoracic Endovascular Aortic Repair Endograft Length in Type B Aortic Dissection

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FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY 2022年 10卷 825015页

作者： Aghilinejad, Arian Wei, Heng Magee, Gregory A. Pahlevan, Niema M. Univ Southern Calif Dept Aerosp & Mech Engn Los Angeles CA 90007 USA Univ Southern Calif Keck Sch Med Dept Surg Div Vasc Surg & Endovascular Therapy Los Angeles CA USA Univ Southern Calif Dept Med Div Cardiovasc Med Los Angeles CA 90007 USA

Thoracic endovascular aortic repair (TEVAR) is a commonly performed operation for patients with type B aortic dissection (TBAD). The goal of TEVAR is to cover the proximal entry tear between the true lumen (TL) and the false lumen (FL) with an endograft to induce FL thrombosis, allow for aortic healing, and decrease the risk of aortic aneurysm and rupture. While TEVAR has shown promising outcomes, it can also result in devastating complications including stroke, spinal cord ischemia resulting in paralysis, as well as long-term heart failure, so treatment remains controversial. Similarly, the biomechanical impact of aortic endograft implantation and the hemodynamic impact of endograft design parameters such as length are not well-understood. In this study, a fluid-structure interaction (FSI) computational fluid dynamics (CFD) approach was used based on the immersed boundary and Lattice-Boltzmann method to investigate the association between the endograft length and hemodynamic variables inside the TL and FL. The physiological accuracy of the model was evaluated by comparing simulation results with the true pressure waveform measurements taken during a live TEVAR operation for TBAD. The results demonstrate a non-linear trend towards increased FL flow reversal as the endograft length increases but also increased left ventricular pulsatile workload. These findings suggest a medium-length endograft may be optimal by achieving FL flow reversal and thus FL thrombosis, while minimizing the extra load on the left ventricle. These results also verify that a reduction in heart rate with medical therapy contributes favorably to FL flow reversal.

关键词： aortic dissection endovascular repair blood pressure hemodynamics fluid-structure interaction medical therapy

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A Computational fluid Dynamics Approach for Modeling the fluid-structure interaction of Offshore Aquaculture Cages and Waves

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JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME 2022年第2期144卷 021902-021902页

作者： Martin, Tobias Bihs, Hans Norwegian Univ Sci & Technol NTNU Dept Civil & Environm Engn N-7491 Trondheim Norway

Open ocean aquaculture cages became a promising alternative to traditional fish cage designs recently. The offshore environment implies larger loads on the structure and thus higher risk for fish loss. Floating rigid aquaculture cages with stiff nets are considered as a possible solution to cope with these new challenges. Their design process requires more advanced tools to account for the non-linear fluid-structure interaction. This paper presents a suitable numerical approach for analyzing the interaction of offshore aquaculture cages and waves using computational fluid dynamics. Here, a numerical wave tank accounts for the accurate propagation of the waves, and dynamic solutions are utilized for the cage system. Two-way coupling is enabled by accounting for the influence of the net on the fluid. The numerical model is validated against measurements for the loads on and the responses of a mobile floating fish farm in waves and current.

关键词： dynamics of structures floating and moored production systems fluid-structure interaction hydrodynamics ocean space utilization

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