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Rigid body in compressible flow with general inflow-outflow boundary data

ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK 2025年第2期76卷 1-28页

作者： Axmann, Simon Necasova, Sarka Radosevic, Ana Univ Chem & Technol Fac Chem Engn Tech 5 Prague 16628 Czech Republic Czech Acad Sci Inst Math Zitna 25 Prague 11567 Czech Republic Univ Zagreb Fac Econ & Business Zagreb Croatia

The paper deals with the problem of the motion of a rigid body in a domain filled by the compressible fluid. We consider the nonhomogeneous boundary condition of the velocity and inflow boundary condition for the density. The existence of the weak solutions is shown. The novelty lies in the fact we are considering the general inflow-outflow boundary data, which were not considered before in the context of fluid-structure interaction.

关键词： Compressible flow Inhomogeneous boundary conditions fluid-structure interaction Rigid body Navier-Stokes system

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Parametric analysis of sloshing in concrete liquid storage tanks: a FE-SPH coupled approach with Box-Behnken design of experiments

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JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2024年第6期46卷 1-24页

作者： Soltani, Pouya Mirzabozorg, Hassan K N Toosi Univ Technol Fac Civil Engn Tehran Iran

This study aims to investigate sloshing in liquid storage tanks using a coupled FE-SPH technique. A novel approach employing the Box-Behnken method for efficient analysis design is introduced, ensuring the consideration of key parameters to obtain accurate results. The Smoothed Particle Hydrodynamics (SPH) formulation is utilized to simulate liquid behavior under large-amplitude sloshing waves, while the finite element method models the structural response. The analysis reveals that fluid height is the primary geometric parameter affecting sloshing, with tank length considered a secondary factor. The frequency characteristics of ground motion significantly influence sloshing, thereby impacting the liquid's behavior in the container. For future studies, we recommend focusing on the Box-Behnken design parameters: Acceleration Spectrum Intensity (ASI) and liquid tank height. This research provides valuable insights into optimizing the design and analysis of liquid storage tanks, paving the way for enhanced structural safety and performance.

关键词： Box-Behnken method FE-SPH coupling fluid-structure interaction Sloshing Storage tanks

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A mixed-dimensional formulation for the simulation of slender structures immersed in an incompressible flow

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2024年第PartA期432卷

作者： Lespagnol, Fabien Grandmont, Celine Zunino, Paolo Fernandez, Miguel A. Politecnico Milano Dept Math MOX Milan Italy Sorbonne Univ Inria CNRS Lab Jacques Louis LJLL L Paris France Univ Libre Bruxelles Dept Math Brussels Belgium

We consider the simulation of slender structures immersed in a three-dimensional (3D) flow. By exploiting the special geometric configuration of the slender structures, this particular problem can be modeled by mixed-dimensional coupled equations. Taking advantage of the slenderness of the structure and thus considering 3D/1D coupled problems raise several challenges and difficulties. From a mathematical point of view, these include defining well-posed trace operators of co-dimension two. On the computational standpoint, the non-standard mathematical formulation makes it difficult to ensure the accuracy of the solutions obtained with the mixed-dimensional discrete formulation as compared to a fully resolved one. Here we proposed to circumvent theses issues by imposing the fluid-structure coupling conditions on the 2D fluid-structure interface but in a reduced way still taking advantage of the 1D dynamic of the slender structure. We consider the Navier-Stokes equations for the fluid and a Timoshenko beam model for the structure. We complement these models with a mixed-dimensional version of the fluid-structure interface conditions, based on the projection of kinematic coupling conditions on a finite-dimensional Fourier space on each beam cross section. Furthermore, we develop a discrete fictitious domain formulation within the framework of the finite element method, establish the energy stability of the scheme, provide extensive numerical evidence of the accuracy of the discrete formulation, notably with respect to a fully resolved (ALE based) model and a standard reduced modeling approach.

关键词： fluid-structure interaction Slender structures Mixed-dimensional model Fictitious domain method

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Evaluation of dynamic loads and performance indexes in tiltrotors using a mid-fidelity aeroservoelastic tool

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AEROSPACE SCIENCE AND TECHNOLOGY 2024年 146卷

作者： Savino, Alberto Cocco, Alessandro Muscarello, Vincenzo Politecnico Milano Dipartimento Sci & Tecnol Aerospaziali Via La Masa 34 I-20156 Milan Italy Univ Maryland Dept Aerosp Engn 3182 Glenn L Martin Hall College Pk MD 20742 USA RMIT Univ Aerosp Engn & Aviat 264 Plenty Rd Melbourne Vic 3082 Australia

This work presents a comprehensive numerical environment, obtained by the coupling of a mid -fidelity aerodynamic solver based on a vortex particle method with a multibody dynamics tool, for aeroelastic simulations suitable for the analysis and design of next -generation rotary -wing aircraft. Indeed, the presence of multiple propellers and rotors, together with interactional aerodynamics, have a strong impact on dynamic loads and performance indexes on rotorcraft. A mid -fidelity approach provides an ideal trade-off between the accuracy of the solution and the speed of execution required in the preliminary design phases of these vehicles. A tiltrotor model representative of the Bell XV-15 with different levels of complexity is proposed as a test benchmark, whose characteristics can be similar to an eVTOL. The coupled solver shows the capability to determine the trim conditions in airplane mode and predicts steady and periodic trim loads. Transient analyses are presented as well, considering a roll maneuver and highlighting the importance of the accurate representation of rotary wing aerodynamics provided by the vortex particle method for load evaluation and vibrational assessment.

关键词： Aeroelasticity fluid-structure interaction Tiltrotor VTOL Mid-fidelity aerodynamics Multibody dynamics

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Using the Finite Element Simulation Software Ansys to Analyze the Stress and Strain Generated in the Eyeball due to Pressure When Subjected to Compression

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SENSORS AND MATERIALS 2024年第10期36卷 4179-4191页

作者： Cai, Sufang Wu, Pei-Chang Cheng, Chih-Chung Hsu, Chao-Ming Poon, Linda Yi-Chieh Yang, Cheng-Fu Fujian Univ Tradit Chinese Med Rehabil Hosp Fuzhou 350001 Peoples R China Kaohsiung Chang Gung Mem Hosp Dept Ophthalmol Kaohsiung 833 Taiwan Chang Gung Univ Sch Med Taoyuan 333 Taiwan Natl Kaohsiung Univ Sci & Technol Dept Mech Engn Kaohsiung 807 Taiwan Natl Univ Kaohsiung Dept Chem & Mat Engn Kaohsiung 811 Taiwan Chaoyang Univ Technol Dept Aeronaut Engn Taichung 413 Taiwan

In this study, we conducted stress and strain analyses on the eyeball under pressure using the finite element simulation software Ansys. The eyeball model was constructed using SolidWorks, and additionally, it simulates a contact-type tonometer, applying pressure to the eyeball through probe force variations and calculating the pressure changes inside the eyeball. Initially, the cornea, sclera, ciliary body, suspensory ligaments, aqueous humor, and vitreous humor were combined using SolidWorks. Subsequently, the model was imported into Ansys for meshing, boundary setting, and simulation calculation. Finally, the analysis results were extracted using the Ansys postprocessor and the simulated data were validated against actual measurement data to ensure accuracy. Material properties necessary for the eyeball under pressure analyses were configured, with the Mooney-Rivlin hyperelastic material being selected. During compression, the cornea and sclera primarily absorbed the concentrated load after compression. Pressure was applied using a probe to observe variations in stress and strain concerning the applied force and intraocular pressure. Three probe materials (rubber, titanium alloy, and glass) were chosen for comparative simulation analyses.

关键词： stress and strain intraocular pressure (IOP) fluid-structure interaction applanation tonometry ocular biomechanics

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fluid-structure coupled simulation framework for lightweight explosion containment structures under large deformations

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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2025年 199卷

作者： Narkhede, Aditya Islam, Shafquat Sun, Xingsheng Wang, Kevin Virginia Tech Kevin T Crofton Dept Aerosp & Ocean Engn Blacksburg VA 24061 USA Univ Kentucky Dept Mech & Aerosp Engn Lexington KY 40506 USA

Lightweight, single-use explosion containment structures provide an effective solution for neutralizing rogue explosives, combining affordability with ease of transport. This paper introduces a three-stage simulation framework that captures the distinct physical processes and time scales involved in detonation, shock propagation, and large, plastic structural deformations. A working hypothesis is that as the structure becomes lighter and more flexible, its dynamic interaction with the gaseous explosion products becomes increasingly significant. Unlike previous studies that rely on empirical models to approximate pressure loads, this framework employs a partitioned procedure to couple a finite volume compressible fluid dynamics solver with a finite element structural dynamics solver. Given the rapid expansion of explosion products and the large structural deformation, the level set and embedded boundary methods are utilized to track the fluid-fluid and fluid- structure interfaces. The interfacial mass, momentum, and energy fluxes are computed by locally constructing and solving one-dimensional bi-material Riemann problems. A case study is presented involving a thin-walled steel chamber subjected to an internal explosion of 250 g TNT. The result shows a 30% increase in the chamber volume due to plastic deformation, with its strains remaining below the fracture limit. Although the incident shock pulse carries the highest pressure, the subsequent pulses from wave reflections also contribute significantly to structural deformation. The high energy and compressibility of the explosion products lead to highly nonlinear fluid dynamics, with shock speeds varying across both space and time. Comparisons with simpler simulation methods reveal that decoupling the fluid and structural dynamics overestimates the plastic strain by 43.75%, while modeling the fluid dynamics as a transient pressure load fitted to the first shock pulse underestimates the plastic strain by 31.25%.

关键词： Detonation Shock waves Lightweight structures fluid-structure interaction Embedded boundary method High-performance computing

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Importance of Considering Temporal Variations in Pulse Wave Velocity for Accurate Blood Pressure Prediction

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ANNALS OF BIOMEDICAL ENGINEERING 2025年第5期53卷 1080-1094页

作者： Bantwal, Aditya Satishkumar Bhayadia, Amit Kumar Meng, Hui Univ Buffalo Dept Mech & Aerosp Engn Buffalo NY 14260 USA

PurposeContinuous, cuffless blood pressure (BP) monitoring devices based on measuring pulse wave velocity (PWV) or pulse transit time (PTT) are emerging but are often plagued by large prediction errors. A key issue is that these techniques typically rely on a single PWV value, assuming a linear response and small arterial wall deformations. However, arterial response to BP is inherently nonlinear, with PWV varying over time [PWV(t)] by up to 50% during a cardiac cycle. This study evaluates the impact of assuming a single PWV on BP prediction *** a fluid-structure interaction (FSI) testbed, we simulate the radial and common carotid arteries with the Holzapfel-Gasser-Ogden (HGO) constitutive model to capture nonlinear arterial behavior under a pulsatile physiological blood flow. Pressure data from FSI simulation are used as the ground truth, while inner area A(t) and two PWV values, at diastole and systole, serve as inputs to BP prediction models. Two models are tested: one using a single PWV value, emulating existing PWV-based BP prediction methods;another using the two PWV values to account for PWV(t).ResultsThe single-PWV BP model produced prediction errors of 17.44 mmHg and 6.57 mmHg for the radial and carotid arteries, respectively. The model incorporating two PWV values reduced these errors by 90.6% and 96.8%, *** on a single PWV in BP prediction models can lead to significant errors. To improve BP accuracy, future efforts should focus on incorporating PWV(t), or at least both diastolic and systolic PWV values, into these models.

关键词： Cuffless blood pressure Pulse wave velocity Pulse transit time fluid-structure interaction Radial artery Systolic

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Partial Discharge Detection from Large Motor Stator Slots Using EFPI Sensors

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SENSORS 2025年第2期25卷 357-357页

作者： Wang, Jinlong Sun, Weizhong Zhou, Jun Wang, Lei Chen, Lianfei Chen, Pengcheng Chen, Qichao Zhang, Weichao Yunnan Elect Power Test & Res Inst Grp Co Ltd Kunming 650214 Peoples R China Harbin Univ Sci & Technol Sch Elect & Elect Engn Harbin 150080 Peoples R China

This study addresses the challenges of electromagnetic interference and unstable signal transmission encountered by traditional sensors in detecting partial discharge (PD) within stator slots of large motors. A novel Extrinsic Fabry-Perot Interferometer (EFPI) sensor with a vibration-coupling air gap was designed to enhance the narrowband resonant detection sensitivity for PD ultrasonic signals by optimizing the diaphragm structure and coupling interface. The sensor features a quartz diaphragm with a thickness of 20 mu M, an effective constrained radius of 0.9 mm, a vibration-coupling air gap depth of 100 mu M, and a first-order natural resonant frequency of 66 kHz. Simulation and experimental analyses revealed the distribution characteristics and propagation paths of ultrasonic signals within stator slots. The results demonstrate that the EFPI sensor effectively detects PD ultrasonic signals at its resonant frequency of 66 kHz with a localization error of less than 5 mm, meeting engineering requirements. This study provides theoretical and practical insights into the efficient detection and precise localization of insulation faults in large motor stators.

关键词： EFPI sensor fluid-structure interaction partial discharge ultrasonic signals acoustic field distribution PD source localization

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A coupled stabilized scheme on decoupled finite smoothed particle hydrodynamics and distributed contact discrete element method to simulate fluid-rigid-body interaction with multibody contacts

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OCEAN ENGINEERING 2025年 316卷

作者： Li, Yudong Wang, Chunfa Li, Yan Joli, Pierre Liu, Moubin Feng, Zhiqiang Southwest Jiaotong Univ Sch Mech & Aerosp Engn Chengdu Peoples R China Univ Paris Saclay Univ Evry LMEE Evry France Peking Univ Coll Engn Beijing Peoples R China

This study suggests a coupled stabilized numerical scheme on fluid-rigid-body interaction with multibody contacts. A compatible model combines the decoupled strategy originally from finite particle method in weakly compressible smoothed particle hydrodynamics scheme (conveniently summarized as decoupled finite smoothed particle hydrodynamics, DFSPH) and a distributed contact discrete element method (DCDEM) to construct complicated geometrical multibody contact frame in fluid-structure interaction. Based on the developed graphics processing unit (GPU) parallel computing architecture in three dimensions (3D), numerical investigations on solid-fluid mixture flows and dam breaking with ice floating blocks are proceeded to verify the availability of present algorithm and diversified treatments. Nonlinear thermal-mechanical dynamic behaviors on fluidstructure interaction are furtherly investigated involving the opening heat exchanging conduction and dissipation on free surface. Analytical results show that these physical information on experiments can be efficiently captured by present numerical scheme, which has the preferable performance and potential industrial applicability.

关键词： fluid-structure interaction Large eddy simulation Decoupled finite smoothed particle hydrodynamics Distributed contact discrete element method Industrial applicability

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Quality control of robotic floor-tiling by the modifications on technology parameters and adhesive properties

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JOURNAL OF FIELD ROBOTICS 2025年第1期42卷 356-372页

作者： Wu, Kai Zhang, Yanrong Kong, Xiangming Zhang, Shuang Gao, Liang Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China Tsinghua Univ Inst Bldg Mat Dept Civil Engn Beijing 100084 Peoples R China

Floor-tiling robotics are increasingly employed in on-site building constructions owing to their remarkable benefits on rising working efficiency and reducing labor costs. In this study, a fluid-structure interaction (FSI) model of robotic tiling was established for the first time, construction parameters and adhesive properties were modified, and their influences on the quality of robotic floor-tiling were systematically investigated by tracking the mechanical behaviors of tiles and adhesive during tiling and the interfacial defects after tiling. Results indicated that the established FSI model was feasible for assessing robotic tiling quality with a deviation of less than 2%. The adhesive extruded horizontally was evenly distributed in cylindrical strips. An increase in the number of extrusion pipes slightly improved the tiling quality. Compared with the leveling loads of compression and vertical vibration, shear vibration could effectively eliminate tile rebounding and enlarge the contact area of tile-adhesive by up to 135.85%. Moderate increases in the amplitude and frequency of shear vibration resulted in lower rebounding and larger contact areas. An appropriate increase of yield stress heightened tiling quality by keeping the extrusive appearance of the adhesive, increasing slightly tile rebounding and enlarging the contact area of tile-adhesive to 0.625 m2. As yield stress was excessively high, tremendous elastic deformations of adhesive led to remarkable tile rebounding and small contact areas of 0.375 m2.

关键词： fluid-structure interaction interfacial defects material properties mechanical behaviors quality control robotic floor-tiling technology parameters

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