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Understanding the fluid-structure interaction from wave diffraction forces on CALM buoys: numerical and analytical solutions

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SHIPS AND OFFSHORE structureS 2022年第11期17卷 2545-2573页

作者： Amaechi, Chiemela Victor Wang, Facheng Ye, Jianqiao Univ Lancaster Dept Engn Lancaster LA1 4YR England Stand Org Nigeria Son Standardisat Directorate 52 Lome CrescentWuse Zone 7 Abuja 900287 Nigeria Tsinghua Univ Dept Civil Engn Beijing 100084 Peoples R China

This research fills the gap in understanding fluid-structure interaction (FSI) from wave diffraction forces on CALM buoys and cylindrical structures, based on the hydrodynamics with connections. Recently, there is an increased application of (un)loading marine hoses for Catenary Anchor Leg Moorings (CALM) buoy systems in the offshore industry due to the need for more flexible marine structures that are cost-saving, easier to install, and service. However, different operational issues challenge these hoses, like during hose disconnection. Also, the fluid behaviour was investigated based on the analytical and numerical models. The numerical modelling involves the boundary element method (BEM) and Orcaflex line theory. Hydrodynamic analysis is conducted on the disconnection-induced load response of marine bonded hoses during normal operation and accidental operation under irregular waves. A comparative study on hose performance during normal operation and accidental operation is also presented. Results of statistical analysis on CALM buoy system shows good motion characteristics.

关键词： Wave diffraction forces marine bonded hose ocean waves hydrodynamics disconnection-induced load Catenary Anchor Leg Mooring (CALM) buoy fluid-structure interaction

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Investigation of the cutting fluid's flow and its thermomechanical effect on the cutting zone based on fluid-structure interaction (FSI) simulation

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2022年第1-2期121卷 267-281页

作者： Liu, Hui Meurer, Markus Schraknepper, Daniel Bergs, Thomas Rhein Westfal TH Aachen Lab Machine Tools & Prod Engn WZL Campus Blvd 30 D-52074 Aachen Germany Fraunhofer Inst Prod Technol IPT Steinbachstr 17 D-52074 Aachen Germany

Cutting fluids are an important part of today's metal cutting processes, especially when machining aerospace alloys. They offer the possibility to extend tool life and improve cutting performance. However, the equipment and handling of cutting fluids also raises manufacturing costs. To reduce the negative impact of the high cost of cutting fluids, cooling systems and strategies are constantly being optimized. In most existing works, the influences of different cooling strategies on the relevant process state variables, such as tool wear, cutting forces, chip breakage, etc., are empirically investigated. Due to the limitations of experimental methods, analysis and modeling of the working mechanism has so far only been carried out at a relatively abstract level. For a better understanding of the mechanism of cutting fluids, a thermal coupled two-dimensional simulation approach for the orthogonal cutting process was developed in this work. This approach is based on the Coupled Eulerian Lagrangian (CEL) method and provides a detailed investigation of the cutting fluid's impact on chip formation and tool temperature. For model validation, cutting tests were conducted on a broaching machine. The simulation resolved the fluid behavior in the cutting area and showed the distribution of convective cooling on the tool surface. This work demonstrates the potential of CEL-based cutting fluid simulation, but also pointed out the shortcomings of this method.

关键词： Cutting fluid simulation fluid-structure interaction Orthogonal cutting Heat transfer

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Stability and error analysis of a splitting method using Robin-Robin coupling applied to a fluid-structure interaction problem

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NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS 2022年第5期38卷 1396-1406页

作者： Burman, Erik Durst, Rebecca Guzman, Johnny UCL Dept Math London England Brown Univ Div Appl Math Providence RI 02912 USA

We analyze a splitting method for a canonical fluid structure interaction problem. The splitting method uses a Robin-Robin boundary condition to define an explicit coupling between the fluid and the structure. We prove the method is stable and, furthermore, we provide an error estimate that shows the error at the final time T is O(T Delta t) where Delta t is the time step.

关键词： fluid-structure interaction Robin-Robin coupling

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Non-manifold anisotropic mesh adaptation: application to fluid-structure interaction

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ENGINEERING WITH COMPUTERS 2022年第5期38卷 4269-4288页

作者： Vanharen, Julien Loseille, Adrien Alauzet, Frederic Inria Saclay Gamma Project F-91120 Palaiseau France

A new strategy for high-fidelity unsteady mesh adaptation dealing with fluid-structure interaction (FSI) problems is presented using a partitioned approach. The Euler equations are solved by an edge-based Finite-Volume solver whereas the linear elasticity equations are solved by the finite-element method using the Lagrange P-1 elements. The coupling between both codes is realized by imposing suitable boundary conditions on conforming meshes even at the fluid-structure interface. Small displacements of the structure are assumed and so the mesh is not deformed. The unsteady mesh adaptation process is based on a unique cavity operator which can handle non-manifold geometry, the fluid-structure interface in this work. The computation of a well-documented two-dimensional test case is finally carried out to perform validation of this new strategy as well as a three-dimensional test case to demonstrate our ability to treat complex three-dimensional test cases.

关键词： Finite volume Finite element fluid-structure interaction Unsteady mesh adaptation Non-manifold geometry Shock waves

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Topology optimization of stationary fluid-structure interaction problems including large displacements via the TOBS-GT method

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STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION 2022年第11期65卷 1-18页

作者： Silva, K. E. S. Sivapuram, R. Ranjbarzadeh, S. Gioria, R. S. Silva, E. C. N. Picelli, R. Polytech Sch Univ Sao Paulo Dept Naval Architecture & Ocean Engn Sao Paulo Brazil Univ Calif San Diego Struct Engn Dept San Diego CA 92103 USA Univ Sao Paulo Dept Mechatron & Mech Syst Engn Polytech Sch Sao Paulo Brazil Univ Sao Paulo Dept Min & Petr Engn Polytech Sch Sao Paulo Brazil

This paper addresses the topology optimization of fluid-structure interaction (FSI) systems considering large displacements. We consider the steady-state analysis of flexible structures in contact with a fluid flow governed by the incompressible Navier-Stokes equations. The optimization method used in this work considers the physical analysis and optimization module in a decoupled form. The decoupled analysis allows the finite element problem to be meshed and solved accordingly to the physics requirements. Optimized geometry is constructed by reading and trimming out from an optimization grid described by a set of binary {0, 1} design variables. The method is so-called TOBS (Topology Optimization of Binary structures) with geometry trimming (TOBS-GT). Displacements are resolved using an elastic formulation with geometrical nonlinearities to allow for large deformations. The FSI system is solved by using finite elements and the Arbitrary Lagrangian-Eulerian (ALE) method. Low Reynolds numbers are assumed. The sensitivities are calculated using semi-automatic differentiation and interpolated to optimization grid points. In order to consider large displacements, a mapping between material and spatial coordinates is used to identify and track the deformed configuration of the structure. The optimized binary topology is found by using the standard TOBS approach (Sivapuram and Picelli in Finite Elem Anal Des 139:49-61, 2018) based on sequential integer linear programming. Numerical examples show that the TOBS-GT method can be effectively applied to design 2D and 3D structures in FSI problems including nonlinear structural responses.

关键词： Topology optimization fluid-structure interaction Binary design variables Large displacements

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Modal Analysis of Tubing Considering the Effect of fluid-structure interaction

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ENERGIES 2022年第2期15卷

作者： Duan, Jiehao Li, Changjun Jin, Jin Southwest Petr Univ Coll Petr Engn Chengdu 610500 Peoples R China Southwest Petr Univ CNPC Key Lab Oil & Gas Storage & Transportat Chengdu 610500 Peoples R China CNPC CCDC Downhole Serv Co Chengdu 61050 Peoples R China

When tubing is in a high-temperature and high-pressure environment, it will be affected by the impact of non-constant fluid and other dynamic loads, which will easily cause the tubing to vibrate or even resonate, affecting the integrity of the wellbore and safe production. In the structural modal analysis of the tubing, the coupling effect of the fluid and the tubing needs to be considered at the same time. In this paper, a single tubing is taken as an example to simulate and analyze the modal changes of the tubing under dry mode and wet mode respectively, and the effects of fluid solid coupling effect, inlet pressure, and ambient temperature on the modal of the tubing are discussed. After considering the fluid-structure interaction effect, the natural frequency of tubing decreases, but the displacement is slightly larger. The greater the pressure in the tubing, the greater the equivalent stress on the tubing body, so the natural frequency is lower. Furthermore, after considering the fluid-solid coupling effect, the pressure in the tubing is the true pulsating pressure of the fluid. The prestress applied to the tubing wall changes with time, and the pressures at different parts are different. At this time, the tubing is changed at different frequencies. Vibration is prone to occur, that is, the natural frequency is smaller than the dry mode. The higher the temperature, the lower the rigidity of the tubing and the faster the strength attenuation, so the natural frequency is lower, and tubing is more prone to vibration. Both the stress intensity and the elastic strain increase with the increase of temperature, so the displacement of the tubing also increases.

关键词： tubing modal analysis fluid-structure interaction inlet pressure temperature

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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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Numerical Study of the Impact of fluid-structure interaction on Flow Noise over a Rectangular Cavity

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ENERGIES 2022年第21期15卷

作者： Lojek, Pawel Czajka, Ireneusz Golas, Andrzej AGH Univ Sci & Technol Fac Mech Engn & Robot Dept Power Syst & Environm Protect Facil Mickiewicz 30 Av PL-30059 Krakow Poland

fluid-structure interactions (FSI) can significantly affect flow and the acoustic field generated by it. In this article, simulations of the flow over a rectangular cavity are conducted with and without taking FSI into account. The aim of this research is to conduct a numerical study of the flow over a cavity and to verify whether interactions between the flow and the elastic structure can significantly affect the flow itself or the acoustic pressure field. Four cases involving flexible walls with different material parameters and one reference case with rigid walls were analysed. The two-directional fluid-structure coupling between the flow and cavity walls was simulated. The simulations were performed with the volume and finite element methods using OpenFOAM software to solve the fluid field, CalculiX software to solve the displacement of the structure, and the preCICE library to couple the codes and computed fields. The acoustic analogy of Ffowcs-Williams and Hawkings and the libAcoustics library were used to calculate the sound pressure. The simulation results showed that FSI has a significant influence on sound pressure in terms of both pressure amplitudes and levels as well as in terms of noise frequency composition. There was a significant increase in the sound pressure compared to the case with rigid walls, especially for frequencies above 1 kHz. The frequencies at which this occurred are related to the natural frequencies of the cavity walls and the Rossiter frequencies. Overlap of these frequencies may lead to an increase in noise and structural vibrations, which was observed for one of the materials used. This study may provide insight into the flow noise generation mechanism when fluid-structure interactions are taken into account. The conclusions presented here can form a basis for further work on aerodynamic noise in the presence of thin-walled structures.

关键词： aeroacoustics fluid-structure interaction duct noise

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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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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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