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Martingale Solutions in Stochastic fluid-structure interaction

JOURNAL OF NONLINEAR SCIENCE 2024年第2期34卷 34-34页

作者： Breit, Dominic Mensah, Prince Romeo Moyo, Thamsanqa Castern TU Clasthal Inst Math Erzstr 1 D-38678 Clausthal Zellerfeld Germany

We consider a viscous incompressible fluid interacting with a linearly elastic shell of Koiter type which is located at some part of the boundary. Recently models with stochastic perturbation in the shell equation have been proposed in the literature but only analysed in simplified cases. We investigate the full model with transport noise, where (a part of) the boundary of the fluid domain is randomly moving in time. We prove the existence of a weak martingale solution to the underlying system.

关键词： Incompressible Navier-Stokes equation Transport noise fluid-structure interaction

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A fully-integrated lattice Boltzmann method for fluid-structure interaction

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JOURNAL OF COMPUTATIONAL PHYSICS 2025年 526卷

作者： Sun, Yue Rycroft, Chris H. Univ Wisconsin Madison Dept Math Madison WI 53706 USA Harvard Univ John A Paulson Sch Engn & Appl Sci Cambridge MA 02138 USA Lawrence Berkeley Lab Computat Res Div Berkeley CA 94720 USA

We present a fully-integrated lattice Boltzmann (LB) method for fluid-structure interaction (FSI) simulations that efficiently models deformable solids in complex suspensions and active systems. Our Eulerian method (LBRMT) couples finite-strain solids to the LB fluid on the same fixed computational grid with the reference map technique (RMT). An integral part of the LBRMT is a new LB boundary condition for moving deformable interfaces across different densities. With this fully Eulerian solid-fluid coupling, the LBRMT is well-suited for parallelization and simulating multi-body contact without remeshing or extra meshes. We validate its accuracy via a benchmark of a deformable solid in a lid-driven cavity, then showcase its versatility through examples of soft solids rotating and settling. The LBRMT achieves a spatial convergence rate between first-order and second-order for FSI simulations and is designed for low to intermediate Reynolds number flows with finite inertia at small Mach numbers. With simulations of complex suspensions mixing, we highlight the potential of the LBRMT for studying collective behavior in soft matter and biofluid dynamics.

关键词： fluid-structure interaction Lattice Boltzmann method Complex suspensions Collective motion

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Improved unsteady fluid-structure interaction analysis using the dynamic mode decomposition on a composite marine propeller

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OCEAN ENGINEERING 2025年 319卷

作者： Kim, Sunghoon Shin, Sangjoon Seoul Natl Univ Dept Aerosp Engn Seoul 08826 South Korea HD Hyundai Heavy Ind Ship Performance Res Dept Ulsan 44032 South Korea Seoul Natl Univ Inst Adv Aerosp Technol Seoul 08226 South Korea

Unlike conventional metallic propellers, a composite blade's structural deformation must be considered. Composite marine propellers typically require additional computational time for unsteady analysis to accommodate the structural deflection. This study proposes a fast fluid-structure interaction (FSI) analysis method that considers the blade deformation of composite marine propellers. The unsteady boundary element method was modified for fluid analysis to include the effects of blade deformation. The structural response was predicted by considering the added mass and time-dependent hydrodynamic damping effects. Because an FSI analysis typically requires numerous iterative computations, a structural analysis was conducted using the mode superposition methodology, with hydrodynamic loads converted into the frequency domain via dynamic mode decomposition. Additionally, a quasi-Newton-based algorithm was employed in the iterative FSI analysis to improve the convergence. We performed FSI analyses on two composite propellers and validated the results by comparing them with existing numerical results. Our results show good agreement with existing numerical results, while significantly reducing the computational time.

关键词： Composite marine propeller Dynamic mode decomposition fluid-structure interaction Boundary element method

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A coupled immersed boundary method and isogeometric shell analysis for fluid-structure interaction of flexible and lightweight shells in high-Reynolds number flows

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2025年 439卷

作者： Yan, Keye Wu, Yue Zhu, Qiming Khoo, Cheong Harbin Inst Technol Minist Educ Key Lab Struct Dynam Behav & Control Harbin 150090 Peoples R China Harbin Inst Technol Minist Ind & Informat Technol Key Lab Smart Prevent & Mitigat Civil Engn Disaste Harbin 150090 Peoples R China Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China Natl Univ Singapore Dept Mech Engn Singapore 117575 Singapore

This study presents an efficient numerical framework for simulating fluid-structure interactions (FSIs) involving flexible, lightweight shells subjected to high-Reynolds-number flows. By combining the immersed boundary method (IBM) and isogeometric analysis (IGA), the framework incorporates three major innovations: (1) a wall-modeling, direct-forcing, diffused-interface IBM tailored for FSI simulations with high-Reynolds-number turbulent flows, employing non- equilibrium explicit wall functions;(2) integration of the interface quasi-Newton inverse least-squares (IQN-ILS) method into the IBM/IGA framework to enhance the accuracy and efficiency of iterative Gauss-Seidel coupling in strongly coupled FSI scenarios;and (3) high-order solvers for both fluid and structural domains, featuring a sixth-order compact finite difference method (FDM) for fluid dynamics and isogeometric shell formulations for structural analysis. The framework is validated through four numerical test cases, including simulations of a hinged flag, an inverted flag, a membrane airfoil, and an air-supported membrane structure. The results demonstrate good agreement with reference data, showing the framework's efficiency, accuracy, and applicability for solving large-scale shell-related FSI problems across diverse engineering and scientific domains.

关键词： fluid-structure interaction Immersed boundary method High-Reynolds number flows Isogeometric analysis Wall modeling

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A hybrid strategy for numerical simulations of fluid-structure interaction problems in ocean engineering

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APPLIED OCEAN RESEARCH 2025年 155卷

作者： Liao, Xin Koh, Chan Ghee Chow, Yean Khow Natl Univ Singapore Dept Civil & Environm Engn Singapore 117576 Singapore

A hybrid strategy combining the advantages of the meshless Consistent Particle Method (CPM) and the meshbased Finite Element Method (FEM) is proposed in this paper to solve fluid-structure interaction problems. Water is modelled by CPM, whereas deformable structure is solved by FEM. Unlike some traditional particle methods that require a kernel function in computing spatial derivatives, CPM utilizes Taylor series expansion and avoids the use of artificial values of physical parameters (such as artificial viscosity and sound speed). The interaction between water and structure is achieved by a partitioned approach for its flexibility and ease of implementation. To ensure compatibility between CPM and FEM solutions at the fluid-structure interface, an iteration scheme of enforcing pressure Poisson equation (PPE) is proposed. The accuracy and stability of the proposed hybrid strategy are validated through three benchmark examples: water column on an elastic plate, sloshing of sunflower oil interacting with an elastic baffle, and a dam break with an elastic gate. Comparisons between CPM-FEM results with published experimental and numerical results demonstrate the effectiveness and advantages of the proposed hybrid strategy.

关键词： fluid-structure interaction Consistent particle method Finite element method Taylor series expansion Pressure Poisson equation Elastic structure

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An Approach to Generate Level Set Function from STL File for fluid-structure interaction Computations 6th

An Approach to Generate Level Set Function from STL File for...

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6th International Conference on Geotechnics, Civil Engineering and structures (CIGOS)

作者： Son Tung Dang Johansen, Stein Tore Akhatov, Iskander SINTEF Ind SP Andersens Veg 15B N-7031 Trondheim Norway NTNU Dept Energy & Proc Engn N-7041 Trondheim Norway Skolkovo Inst Sci & Technol Moscow 121205 Russia Viettel High Technol Ind Corp Da Nang Vietnam

ISBN: (纸本)9789811671609;9789811671593

In this paper, we will present an approach to compute the signed distance or level set function from the Standard Triangle Language (STL) file format. Then the level set is used to represent the surface of a given object inside the computational domain. The continuity and Navier-Stokes equations are solved numerically to study the fluid flows over the solid body. The finite-volume method (FVM) is applied to approximate all terms in the governing equations to conserve mass and momentum. The cut-cell method is employed to avoid recomputing the mesh points when the body moves around. The transport equation for the level set function is solved accordingly to update the position of the object.

关键词： fluid-structure interaction Computational fluid dynamics Level-set function Cut-cell method

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Study on the Impact of Tree Species on the Wind Environment in Tree Arrays Based on fluid-structure interaction: A Case Study of Hangzhou Urban Area

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BUILDINGS 2024年第5期14卷 1409页

作者： Zhu, Junhao Luo, Xiaojun Zhai, Yumei Zhang, Guoyi Zhou, Chicheng Chen, Zhonggou Zhejiang Agr & Forestry Univ Dept Landscape & Architecture Hangzhou 311300 Peoples R China China Construct Fifth Engn Div Co Ltd Hangzhou 311300 Peoples R China

In order to improve the level of the urban living environment and improve the comfort level of the microclimate, this paper investigates and simulates numerically the influence on the wind environment of different tree species in various tree array layouts, aiming to enhance wind comfort in tree landscapes and reduce the risk of high wind speeds. Initially, the study analyzes the commonly used tree species in Hangzhou's urban tree arrays (beech, soapberry, and camphor trees), summarizing three types of tree array layouts: retention, through, and enclosure. Subsequently, standard tree models are established to define their crown porosity, trunk elastic modulus, and other physical characteristics. Using fluid-structure interaction methods, the impact of different tree species on the wind environment within various tree array layouts is numerically simulated at a wind speed of 14 m/s. In conclusion, the retention layout is most effective in controlling wind speed. Camphor trees perform excellently in reducing wind speed within both retention and enclosure tree array layouts, with wind reduction efficiencies of 16.06% and 14.09%, respectively. Soapberry trees show optimal wind speed reduction in the through layout, achieving 12.31%.

关键词： wind environment tree canopy characteristics fluid-structure interaction tree species urban tree arrays

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A fluid-structure interaction simulation on the impact of transcatheter micro ventricular assist devices on aortic valves

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024年 254卷 108270-108270页

作者： Wang, Yitao He, Feng Hao, Pengfei Zhang, Xiwen Tsinghua Univ Sch Aerosp Engn Dept Engn Mech Beijing 100084 Peoples R China Tsinghua Univ Dept Engn Mech Appl Mech Lab Beijing 100084 Peoples R China

Background and Objective: The implantation of ventricular assist devices (VADs) has become an important treatment option for patients with heart failure. Aortic valve insufficiency is a common complication caused by VADs implantation. Currently, there is very little quantitative research on the effects of transcatheter micro VADs or the intervention pumps on the aortic valves. Methods: In this study, the multi-component arbitrary Lagrange-Eulerian method is used to perform fluidstructure interaction simulations of the aortic valve model with and without intervention pumps. The effects of intervention pumps implantation on the opening area of the aortic valves, the stress distribution, and the flow characteristics are quantitatively analyzed. Statistical results are consistent with clinical guidelines and experiments. Results: The implantation of intervention pumps leads to the valve insufficiency and causes weak valve regurgitation. In the short-term treatment, the valve regurgitation is within a controllable range. The distribution and variation of stress on the leaflets are also affected by intervention pumps. The whirling flow in the flow direction affects the closing speed of the aortic valves and optimizes the stress distribution of the valves. In the models with whirling flow, the effects of intervention pumps implantation on valve motion and stress distribution differ from those without whirling flow. However, the valve insufficiency and valve regurgitation caused by intervention pumps still exist in the models with whirling flow. Conventional artificial bioprosthetic valves have limited effectiveness in treating the valve diseases caused by intervention pumps implantation. Conclusions: This study quantitatively investigates the impact of intervention pumps on the aortic valves, and investigates the effect of blood rotation on the valve behavior, which is a gap in previous research. We suggest that in the short-term treatment, the implantation of intervention

关键词： Ventricular assist devices Aortic valves fluid-structure interaction Multi-component arbitrary Lagrange-Eulerian method Leaflet motion Effective orifice area Whirling flow

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An assessment of CFD-scale fluid-structure interaction simulations through comprehensive experimental data in cross-flow

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COMPUTERS & fluidS 2024年 278卷

作者： Vivaldi, Daniele Inst Radioprotect & Surete Nucleaire IRSN Cadarach BP3 F-13115 Durance France

Experimental tests accessing both fluid and structure behaviors are mandatory for a consistent and comprehensive assessment of fluid-structure interaction (FSI) numerical simulations. In this paper, recently published results of an experimental configuration of two in -line cantilever cylinders subjected to water cross -flow were considered: instantaneous fluid velocities measurements are available on several positions inside the test section, together with the cylinder vibrations. FSI simulations were performed by coupling Ansys Fluent (for the fluid domain) with Ansys Mechanical (for the solid domain). URANS simulations and Scale -Adaptive Simulations (SAS) were employed as CFD simulation approach. The structure displacements were taken into account through an Arbitrary Lagrangian-Eulerian approach. The fluid-structure coupling was 2 -way explicit. Simulations were performed for two different water mass flow rates. For the highest one, vortex -induced resonance was observed experimentally. The numerical results show consistent agreement in terms of shedding frequency and velocity spectra behind the cylinders. The calculated vibration response is overall consistent, despite some underestimations, for the cylinders not featuring vortex -induced resonance;nevertheless, the experimentally observed vortex -induced resonance could not be reproduced by the numerical simulations.

关键词： fluid-structure interaction CFD-FEA coupling Vortex shedding Vortex-induced vibrations Cross-flow

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Assessment of Hydrological Pressure on Concrete Bridge Piers Considering fluid-structure interaction

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JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES 2024年第6期38卷

作者： Patil, Digambar Kadam, Sachin Walchand Coll Engn Dept Appl Mech Sangli 416416 Maharashtra India

During the last 20 years, fluid-related natural catastrophes caused by climate change have produced severe floods in numerous countries, resulting in many casualties, large scale infrastructure damage, and enormous economic losses. These catastrophic hydrodynamic phenomena disrupt whole transportation networks by washing down bridge decks, piers, and roadways, complicating rescue and recovery efforts. As recent flash floods have demonstrated, inland transportation infrastructure is just as vulnerable to fluid hazards as coastal infrastructure. This research investigates the mechanics of fluid flow impact to learn how fluid currents affect bridge piers. The next step is to build a finite volume bridge pier model that considers the consequences of fluid flow and radial motion around the pier. Results from fluid impact analysis, fluid-structure coupling analysis, and theoretical analysis are contrasted with those derived using the equations specified by national and international design standards. According to the results, it is necessary to raise the fluid flow force computed using the codes' formulas to account for the impact of the flood on the bridge pier. The standard codes for the highway bridge design approach frequently produce a larger fluid flow force result, so we can ignore fluid-structure interaction on the bridge pier in water flow velocity, which is minor. It is possible to disregard the fluid-structure interaction on the bridge pier only when finite volume analysis is performed. Understanding the impact of fluid flow on bridge piers is crucial for enhancing the resilience of transportation infrastructure in the face of increasing hydrodynamic threats due to climate change. This research delves into the mechanics of fluid-structure interaction, shedding light on how fluid currents affect bridge stability. By developing a finite volume bridge pier model, the study provides a more accurate assessment of the forces exerted by floods, enabling engineers to d

关键词： Finite volume method fluid-structure interaction Flood Numerical analysis Design approach

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