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Interplay between complex fluid rheology and wall compliance in the flow resistance of deformable axisymmetric configurations

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JOURNAL OF NON-NEWTONIAN fluid MECHANICS 2025年 336卷

作者： Boyko, Evgeniy Technion Fac Mech Engn Israel Inst Technol IL-3200003 Haifa Israel

Viscous flows through configurations fabricated from soft materials exert stresses at the solid-liquid interface, leading to a coupling between the flow field and the elastic deformation. The resulting fluid-structure interaction affects the relationship between the pressure drop zip and the flow rate q, or the corresponding flow resistance zip/q. While the flow resistance in deformable configurations has been extensively studied for Newtonian fluids, it remains largely unexplored for non-Newtonian fluids even at low Reynolds numbers. We analyze the steady low-Reynolds-number fluid-structure interaction between the flow of a non-Newtonian fluid and a deformable tube. We present a theoretical framework for calculating the leading-order effect of the complex fluid rheology and wall compliance on the flow resistance, which holds for a wide class of non-Newtonian constitutive models. For the weakly non-Newtonian limit, our theory provides the first- order non-Newtonian correction for the flow resistance solely using the known Newtonian solution fora deformable tube, bypassing the detailed calculations of the non-Newtonian fluid-structure-interaction problem. We illustrate our approach fora weakly viscoelastic Oldroyd-B fluid and a weakly shear-thinning Carreau fluid. In particular, we show analytically that both the viscoelasticity and shear thinning of the fluid and the compliance of the deformable tube decrease the flow resistance in the weakly non-Newtonian limit and identify the physical mechanisms governing this reduction.

关键词： fluid-structure interaction Viscoelasticity Oldroyd-B fluid Shear thinning Carreau fluid Lubrication theory Pressure drop Flow resistance Microfluidics

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A solution for vibration analysis of fluid-filled pipe coupled with complex support and flexible base

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2025年第5期239卷 1624-1638页

作者： Gong, Jingfeng Diao, Yingbo Xuan, Lingkuan Yang, Jizhuang Li, Yong Wuhan Univ Sci & Technol Sch Automobile & Traff Engn Wuhan 430081 Peoples R China Xinxiang Vocat & Tech Coll Basic Curriculum Teaching Dept Xinxiang Peoples R China

In this paper, the transfer matrix method (TMM) is developed for fluid-filled pipe vibration isolation system. The mathematical model of the support is established using the four-polo parameters method and the flexible base is used as the impedance boundary. The four-polo parameters and impedance are obtained by the finite element method (FEM). Drawing on the idea of the absorption transfer matrix method (ATMM), the support and flexible base are regarded as special branch pipe, and the overall transfer matrix of the system is established for frequency domain solution. The calculation results are compared with the results from the published literature and FEM to validate the accuracy of the method. And then the influences of support stiffness and damping on the forced vibration characteristics of the branch pipeline system are discussed, which can provide some reference for the vibration and noise control of pipe systems.

关键词： Pipe system fluid-structure interaction TMM vibration isolation system four-polo parameters

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A displacement-based material point method for weakly compressible free-surface flows

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COMPUTATIONAL MECHANICS 2025年第1期75卷 389-405页

作者： Telikicherla, Ram Mohan Moutsanidis, Georgios SUNY Stony Brook Dept Civil Engn Stony Brook NY 11794 USA Inst Adv Computat Sci Stony Brook NY 11794 USA

We introduce a novel displacement-based material point method for simulating weakly compressible free-surface flows and fluid-structure interaction. To address volumetric locking, we employ a B\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\overline{{\textbf {B}}}$$\end{document}/F\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\overline{{\textbf {F}}}$$\end{document}-inspired technique, previously developed for solid mechanics. This technique involves projecting the pressure and the dilatational part of the velocity gradient onto a lower-dimensional approximation space, eliminating complexities associated with two-field mixed formulations and operator splitting approaches. Additionally, to mitigate spurious pressure oscillations resulting from the use of a density-dependent equation of state, we enhance the framework with an artificial viscosity term. Finally, we employ higher-order spline background shape functions, resulting in a continuous representation of the velocity gradient and effectively preventing pressure jumps when material points cross element boundaries. Challenging numerical examples are provided to verify and validate our approach, demonstrating results that closely align with existing literature, exhibit reduced pressure oscillations, and are free of volumetric locking issues.

关键词： Material point method fluid dynamics Weakly compressible flows fluid-structure interaction Artificial viscosity F-bar Method

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Numerical simulation and experimental study on non-invasive pipeline flow measurement based on distributed acoustic sensing

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MEASUREMENT 2025年 244卷

作者： Dai, Shu Liang, Lei Tong, Xiaoling Wang, Hui Wu, Rongchang Jiang, Ke Wuhan Univ Technol Coll Mech & Elect Engn Wuhan 430070 Peoples R China Wuhan Univ Technol Natl Engn Res Ctr Fiber Opt Sensing Technol & Netw Wuhan 430070 Peoples R China Wuhan Univ Technol Sanya Sci & Educ Innovat Pk Sanya 572000 Peoples R China

Non-intrusive flow measurement, utilizing fiber optic distributed acoustic sensing (DAS), is a crucial technological approach for efficient oil and gas extraction from wells. However, current research predominantly focuses on the feasibility of these methods, often neglecting a comprehensive theoretical discussion. This paper introduces and validates a theoretical analysis method for non-intrusive flow measurement based on DAS. We simulate the vibration of a turbulent pipeline through fluid-solid coupling, establish the mapping relationship between DAS measurements and the dynamic strain of the pipeline wall surface using the principles of DAS sensing and the spiral path of the pipeline wall surface, and examine the impact of different optical fiber winding methods on flow measurement. Simulation results indicate that under identical winding methods, the standard deviation of dynamic strain has a significant quadratic relationship with flow;a smaller winding pitch results in lower DAS signal strength, closer alignment with the internal pressure fluctuations of the pipeline, while a larger winding pitch results in higher DAS signal strength, closer alignment with the transverse vibration of the pipeline. These laws are further corroborated by experimental results. The research presented in this paper offers theoretical support and technical guidance for practical industrial applications.

关键词： Distributed Acoustic Sensing (DAS) Non-intrusive flow measurement fluid-structure interaction Dynamic strain Helical path

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Natural mode splitting of a rotating disc in water at different wall distances as a model for high-head francis runners

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JOURNAL OF SOUND AND VIBRATION 2025年 597卷

作者： Xia, Xiang Moraga, Greco Presas, Alexandre Wang, Zhengwei Zhou, Lingjiu China Agr Univ Coll Water Resources & Civil Engn Beijing Peoples R China Univ Politecn Cataluna Ctr Ind Diag & Fluid Dynam Barcelona Spain Tsinghua Univ Dept Energy & Power Engn Beijing Peoples R China

Francis turbines are essential equipments in the realm of sustainable energy production. However, their complex dynamics, particularly in the presence of fluid-structure interaction, pose significant challenges to optimising design and enhancing performance. This study focuses on the phenomenon of frequency splitting of a simplified rotating disc submerged in water, serving as a representative model for high-head Francis runners. The primary objective is to gain a deep understanding of how proximity to surrounding walls affects modal parameters of the rotating runner. This research employs both analytical and numerical methods. For cases characterised by significant asymmetry in wall distances on either side of the disc, we have refined the analytical model for frequency splitting based on the assumed mode method and potential flow theory. Additionally, we have developed a numerical model for predicting modal parameters of underwater rotating discs, building upon the imposed modal motion approach. These methods are validated using existing experimental results, demonstrating excellent consistency. The research indicates that for underwater rotating discs, frequency splitting occurs simultaneously with damping splitting. In general, as wall distances decrease, the degree of splitting increases, and the sensitivity of splitting to changes in wall distance also rises. This comprehensive study provides profound insights into the dynamic behavior of high-head Francis runners, highlighting the pivotal role played by wall proximity in shaping their vibrational behavior.

关键词： High-Head francis turbines Rotating disc Frequency splitting Hydraulic damping fluid-structure interaction

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A robust low-dissipation Riemann-SPH solver with a novel hybrid boundary treatment method for FSI problems

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JOURNAL OF fluidS AND structureS 2025年 135卷

作者： Liu, Xiangdong Yang, Yang Yang, Qiuzu Xu, Fei Northwestern Polytech Univ Sch Aeronaut Xian Peoples R China Natl Key Lab Strength & Struct Integr Xian Peoples R China Taiyuan Univ Technol Coll Aeronaut & Astronaut Taiyuan Peoples R China

Smoothed Particle Hydrodynamics (SPH) method is currently widely used to simulate fluid-structure interaction (FSI) problems, however, challenges such like the particle penetration, fluid tensile instability (TI) problems still arise near the fluid-structure interfaces using the SPH method. In this paper, a highly robust SPH solution method without any empirical parameters and numerical noise was proposed. The coupled normal flux and fixed dummy particle boundary treatment method was chosen to impose the boundary conditions, and an enhanced Riemann SPH solver was introduced to smooth transitions of field variables near the interface. Robustness and accuracy of the proposed method were validated through three typical FSI cases, including water entry of the 2D cylinder, sinking of an eccentric rigid box and water entry of a wedge. Results indicate a high degree of consistency between the present results and reference results. Given that only a single layer of particles needs to be set when using this SPH solution method to discretize structures, the present SPH solution method is suitable for simulating FSI problems with sharp corners or complex geometries and shows promising applications.

关键词： Smoothed particle hydrodynamics fluid-structure interaction Boundary treatment method Low-dissipation Riemann solver

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Constraint effects on the hydroelasticity of very large floating structures

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OCEAN ENGINEERING 2025年 331卷

作者： Zhang, Guiyong Li, Qiankun Jiang, Changqing el Moctar, Ould Sun, Zhe Dalian Univ Technol Sch Naval Architecture Engn State Key Lab Struct Anal Optimizat & CAE Software Dalian 116024 Peoples R China Univ Duisburg Essen Inst Sustainable & Autonomous Maritime Syst D-47057 Duisburg Germany

Offshore structures are continuously subjected to wave-induced loads, resulting in both rigid-body motion and elastic deformation. In very large floating structures (VLFSs), hydroelastic deformation is primarily characterized by vertical displacement, encompassing both oscillatory motion and flexible deflection. Hydroelastic analysis typically involves imposing constraints to restrict body motion in waves, which can significantly influence deformation behavior. To assess the impact of these constraints, this study examines how different boundary conditions affect the hydroelastic response of VLFSs. Specifically, five test cases with distinct constraint conditions are designed to systematically evaluate their effects across multiple wavelengths. A coupled numerical methodology integrating computational fluid dynamics (CFD) and computational structural dynamics (CSD) is developed to analyze hydroelastic deformation under these conditions. Strain distributions at key locations along the floating structure are examined under varying wave conditions. Results indicate that spring constraints provide a stable deformation pattern, aligning well with physical expectations in both long and short waves. This study highlights the critical role of constraint selection in VLFS modeling and suggests that future research should explore multi-directional wave effects and diverse restraint configurations to enhance VLFS design and performance.

关键词： Hydroelastic response fluid-structure interaction Wave-structure interaction Very large floating structures

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Numerical investigations of the successive wave strike processes on the coastal slope dike using OpenFOAM

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OCEAN ENGINEERING 2025年 324卷

作者： Huang, Zhaoyuan Hou, Yadong Lu, Fajing Zhao, Xizeng Zhejiang Univ Ocean Coll Zhoushan 316021 Zhejiang Peoples R China Zhejiang Univ Ocean Res Ctr Zhoushan Zhoushan 316021 Zhejiang Peoples R China Zhejiang Ocean Univ Sch Marine Engn Equipment Zhoushan 316022 Zhejiang Peoples R China

During extreme climate and weather events, periodic large waves rush up coastal slope dike structures and develop overtopping flows, causing various hydrodynamic actions on coastal structures and pedestrians, resulting in casualties and property losses. This paper established a high-precision three-dimensional numerical wave flume based on a finite-volume discrete two-phase flow solver. Regular wave overtopping behaviors and flow strike actions on the crest of a simple slope dike and a compound slope dike berm were simulated and investigated. The hydrodynamic characteristics of successive wave strike accidents against objectives located on the coastal dikes were analyzed and summarized. Regular waves were selected to clarify the mechanisms affected by the two key parameters: wave period and wave height. The distribution mechanisms of parameters, such as the thickness and velocity of the flow layer and the fluid forces exerted on the cylinder on the simple slope dike crest, were analyzed. The study featured the reflecting flow over the berm of the compound slope dike and the nonlinear flow behavior created by successive incident regular waves. It revealed the crucial influencing mechanism of the incident wave period on various hydrodynamic parameters.

关键词： Coastal slope dikes Successive wave strike events fluid-structure interaction Flow layer properties fluid force InterFoam

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Experimental study on a novel wind gust generator based on an adaptive nozzle design

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JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS 2025年 261卷

作者： Wood, J. N. Breuer, M. Helmut Schmidt Univ Hamburg Stromungsmech D-22043 Hamburg Germany

The paper presents a novel design of a wind gust generator based on an adaptive nozzle for wind tunnel applications and its experimental investigation. The key feature of this design is the movable upper wall of the nozzle, which adjusts the cross-section of the nozzle's outlet. For this purpose, the upper contour of the nozzle is connected to a programmable and fast-moving tooth belt axis, enabling rapid changes in the nozzle geometry to generate reproducible horizontal wind gusts that develop along a flat ground plate. The experimental setup primarily relies on particle-image velocimetry as an optical measurement technique, supported by a constant- temperature anemometer and pressure taps at specific locations. The gusts are generated using a well-defined motion pattern of the movable nozzle, following a (1 - cos)-type signal. A combination of velocity and surface pressure measurements is carried out, analyzing the gust development at various positions along the ground plate in streamwise direction. Both data sets are used to quantify the adaptive nozzle's potential as an effective tool for wind gust generation, facilitating future studies on highly dynamic fluid-structure interactions under wind gust load. Additionally, the well-designed experiment is planned to serve as a valuable validation case for numerical methods.

关键词： Wind gust Adaptive nozzle Wind tunnel Particle-image velocimetry Constant-temperature anemometry Surface pressure fluid-structure interaction

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Dynamic responses of riveted fuel containers subjected to oblique impacts

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THIN-WALLED structureS 2025年 207卷

作者： Ren, Kerong Miao, Jitian Qing, Hua Xu, Wentao Peng, Yong Jia, Haobo He, Zongkai Li, Xiangyu Chen, Rong Lu, Fangyun Air Force Engn Univ Aviat Maintenance NCO Acad Xinyang 464001 Peoples R China Natl Univ Def Technol Coll Sci Changsha 410008 Peoples R China Zhengzhou Univ Sch Mech & Safety Engn Zhengzhou 450000 Peoples R China Hunan Univ State Key Lab Adv Design & Mfg Technol Vehicle Changsha 410082 Peoples R China

When a high-speed projectile impacts the fuel containers, it generates hydrodynamic ram (HRAM) with significant kinetic energy causing serious damage to structures. In this study, we performed oblique ballistic impact tests on the riveted fuel containers, testing the dynamic displacement field and velocity field of the rear plate of the fuel containers using the 3D-DIC technique. The finite element simulations were also reproduced to probe the dynamic response behavior of the fuel containers. The results revealed that the propagation velocity and amplitude of HRAM were influenced by the impact velocity, impact angle, and propagation distance. The amplitude of the pioneer wave exhibited a strong impact-angle dependence. The HRAM on the rear plate displays unique temporal and spatial distribution characteristics. The impact velocity and impact angle together determined the evolution of the deformation mode of the fuel containers. Higher impulse led to the formation of a petal hole (PH), while the impact angle resulted in the rear plate of the rivets in the boundary and the formation of a free and non-fixed boundary. These elements suggested an interesting coupled phenomenon of the petal hole with a free boundary and the deformation of the plastic hinge. In the space of hole size and the total impulse I of HRAM acting on the rear plate, there are three regions. The first is the region dominated by the circular hole formed by direct penetration for small I. The second is the region dominated by PH with 3-edges fixed for medium I. The third is the region dominated by PH with 4-edges fixed for large I.

关键词： Hydrodynamic ram Riveted fuel container 3D-digital image correlation fluid-structure interaction Dynamic deformation

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