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Analysis of thermally activated fluid-structure interaction for a morphing plate immersed in turbulent flow

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2022年 194卷

作者： Caccavale, Paolo Mele, Benedetto De Bonis, Maria Valeria Ruocco, Gianpaolo Univ Basilicata Coll Engn Via Ateneo Lucano I-85100 Potenza Italy Univ Federico II Ind Engn Dept Piazzale Tecchio I-80125 Naples Italy

In the framework of vehicle aerodynamics, new integrated systems can be developed based on shape memory metal alloys (SMAs) capability to perform surface morphing. Such systems can be exploited to create appendices containing active composites that change shape in response to variable thermal inputs, in relation to the desired aerodynamic behavior. The purpose of these systems is to offer benefits in terms of vehicle's performance and fuel consumption rate. Even the design of the simplest geometry appendix, a finite horizontal plate aligned with a turbulent air flow, is nevertheless affected by three intertwined and nonlinear phenomena - namely the solid/fluid/thermal interactions. In order to approach the definition of appropriate design parameters, the space of operating variables must be explored by devising a numerical simulation encompassing the equation of structural motion and the energy and Reynolds Averaged Navier Stokes equations, complemented by a viable turbulence model. In this paper, a fully-coupled model encompassing all phenomena involved is tested by implementing a sensitivity analysis for a thermally activated morphing surface. Temperature, stress and velocity distributions are presented and discussed for a given geometry case. A new metrics leading to aerodynamic lift calculations is then proposed and demonstrated, that will simplify the preliminary design procedures. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Forced convection Conduction Conjugate heat transfer Computational fluid dynamics Shape memory alloy fluid-structure interaction

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An isogeometric b-rep mortar-based mapping method for non-matching grids in fluid-structure interaction

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ADVANCED MODELING AND SIMULATION IN ENGINEERING SCIENCES 2021年第1期8卷 1-55页

作者： Apostolatos, Andreas Emiroglu, Altug Shayegan, Shahrokh Pean, Fabien Bletzinger, Kai-Uwe Wuechner, Roland Tech Univ Munich Chair Struct Anal Arcisstr 21 D-80333 Munich Germany Swiss Fed Inst Technol Zurich Comp Vis Lab Sternwartstr 7 CH-8092 Zurich Switzerland

In this study the isogeometric B-Rep mortar-based mapping method for geometry models stemming directly from Computer-Aided Design (CAD) is systematically augmented and applied to partitioned fluid-structure interaction (FSI) simulations. Thus, the newly proposed methodology is applied to geometries described by their Boundary Representation (B-Rep) in terms of trimmed multipatch Non-Uniform Rational B-Spline (NURBS) discretizations as standard in modern CAD. The proposed isogeometric B-Rep mortar-based mapping method is herein extended for the transformation of fields between a B-Rep model and a low order discrete surface representation of the geometry which typically results when the Finite Volume Method (FVM) or the Finite Element Method (FEM) are employed. This enables the transformation of such fields as tractions and displacements along the FSI interface when Isogeometric B-Rep Analysis (IBRA) is used for the structural discretization and the FVM is used for the fluid discretization. The latter allows for diverse discretization schemes between the structural and the fluid Boundary Value Problem (BVP), taking into consideration the special properties of each BVP separately while the constraints along the FSI interface are satisfied in an iterative manner within partitioned FSI. The proposed methodology can be exploited in FSI problems with an IBRA structural discretization or to FSI problems with a standard FEM structural discretization in the frame of the Exact Coupling Layer (ECL) where the interface fields are smoothed using the underlying B-Rep parametrization, thus taking advantage of the smoothness that the NURBS basis functions offer. All new developments are systematically investigated and demonstrated by FSI problems with lightweight structures whereby the underlying geometric parametrizations are directly taken from real-world CAD models, thus extending IBRA into coupled problems of the FSI type.

关键词： Mortar-based mapping Isogeometric B-Rep analysis Trimmed NURBS multipatches Exact coupling layer Penalty method fluid-structure interaction

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EXPERIMENTAL INVESTIGATION OF fluid-structure interaction IN LINKED FLEXIBLE NET CAGES 40

EXPERIMENTAL INVESTIGATION OF FLUID-STRUCTURE INTERACTION IN...

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40th ASME International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Dong, Shuchuang Zhou, Jinxin Li, Qiao Yoshida, Takero Kitazawa, Daisuke Univ Tokyo Inst Ind Sci Kashiwa Chiba Japan

ISBN: (纸本)9780791885154

In the present study, three flexible net cage groups (a single net cage, two net cages arrayed in one column, and three net cages arrayed in one column) were investigated in a flume tank, in order to analyze the hydrodynamic characteristics of the flow and linked flexible net cage, such as the drag force, cage deformation, and flow field inside and around. Based on these results, the fluid-structure interactions of the flexible net cage were discussed. The drag forces and cage deformation of a single flexible net cage were first studied, and their relationships to the current speed were found consistent with existing literature. The averaged current speed inside the single net cage was 0.72 for all incoming current speeds. Furthermore, significant current speed reductions occurred behind the single net cage, at the downstream, for all incoming current speeds. Within the measurement range, the current speed reduction area downstream from the single net cage was almost as wide as the cage diameter, and the length was up to 1.4 times cage diameters along the incoming current direction. The location of this area gradually approached the water surface as the current speed increased. In the case of two flexible net cages arrayed in one column, the differences in drag force occurred when the distance between the two cages was changed. In addition, the current speed incident on the downstream cage tended to decrease, as the distance between the cages increased. The averaged current speeds incident on the downstream cage were 0.54, 0.44, 0.77, and 0.40 when the distances between two cages were 30.0 cm, 60.0 cm, and 90.0 cm, respectively. In the case of three flexible net cages arrayed in one column, the total drag force of three flexible net cages was 2.2 times that of a single net cage. On the other hand, at the maximum current speed of 50 cm/s, the cross-sectional areas of the first net cage, the second net cage, and the third net cage were 177.10 cm(2), 274.19 cm(2), and

关键词： Flume tank experiments fluid-structure interaction Flexible net cage Linked net cages

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A hybrid partitioned deep learning methodology for moving interface and fluid-structure interaction

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COMPUTERS & fluidS 2022年 233卷 1页

作者： Gupta, Rachit Jaiman, Rajeev Univ British Columbia Dept Mech Engn Vancouver BC V6T 1Z4 Canada

In this work, we present a hybrid partitioned deep learning framework for the reduced-order modeling of moving interfaces and predicting fluid-structure interaction. Using the discretized Navier-Stokes in the arbitrary Lagrangian-Eulerian reference frame, we generate the full-order flow snapshots and point cloud displacements as target physical data for the learning and inference of coupled fluid-structure dynamics. The hybrid operation of this methodology comes by combining two separate data-driven models for fluid and solid subdomains via deep learning-based reduced-order models (DL-ROMs). The proposed multi-level framework comprises the partitioned data-driven drivers for unsteady flow and the moving point cloud displacements. At the fluid-structure interface, the force information is exchanged synchronously between the two partitioned subdomain solvers. The first component of our proposed framework relies on the proper orthogonal decomposition-based recurrent neural network (POD-RNN) as a DL-ROM procedure to infer the point cloud with a moving interface. This model utilizes the POD basis modes to reduce dimensionality and evolve them in time via long short-term memory-based recurrent neural networks (LSTM-RNNs). The second component employs the convolution-based recurrent autoencoder network (CRAN) as a self-supervised DL-ROM procedure to infer the nonlinear flow dynamics at static Eulerian probes. We introduce these probes as spatially structured query nodes in the moving point cloud to treat the Lagrangian-to-Eulerian conflict together with convenience in training the CRAN driver. To determine these Eulerian probes, we construct a novel snapshot-field transfer and load recovery algorithm. They are chosen in such a way that the two components (i.e., POD-RNN and CRAN) are constrained at the interface to recover the bulk force quantities. These DL-ROM-based data-driven drivers rely on the LSTM-RNNs to evolve the low-dimensional states. A popular prototypical flui

关键词： fluid-structure interaction Deep learning-based reduced-order model Proper orthogonal decomposition Convolutional autoencoder Long short-term memory network Digital twin

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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 337-337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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A coupled SPH-PD model for fluid-structure interaction in an irregular channel flow considering the structural failure

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年第PartB期401卷 1页

作者： Sun, Wei-Kang Zhang, Lu-Wen Liew, K. M. Shanghai Jiao Tong Univ Sch Naval Architecture Ocean & Civil Engn Dept Engn Mech Shanghai 200240 Peoples R China City Univ Hong Kong Dept Architecture & Civil Engn Kowloon Hong Kong Peoples R China City Univ Hong Kong Ctr Nat Inspired Engn Kowloon Hong Kong Peoples R China

Understanding fluid-structure interaction (FSI) is important because it dominates diverse natural phenomena and engineering problems. This paper presents an integrated particle model for FSI problems involving irregular channel flows and crack propagation in structures. The proposed model is implemented as follows: (1) we couple weakly compressible smoothed particle hydrodynamics (WCSPH) with bond-based peridynamics (BBPD) in a partitioned approach (this framework has a much simpler algorithm than the previously reported SPH-PD method);(2) we propose a novel periodic boundary conditions (PBCs) algorithm for modeling flows in non-regular channels;and (3) we incorporate crack propagation in structural responses under fluid dynamics, which was rarely considered in previous works. The new framework has been validated and illustrated to be effective and versatile in diverse FSI problems, including hydrostatic pressure-induced solid deformation, violent free-surface flows and channel flows interacting with flexible structures. Compared with conventional grid-based methods, this particle framework is more user-friendly, since no extra effort is required to update meshes, even when a discontinuity appears during the modeling process. The extendibility and potential of this framework is further demonstrated by the simulation of fluid-driven deformation and crack propagation in elastomers. (c) 2022 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Smoothed particle hydrodynamics Peridynamics Integrated particle model Periodic boundary condition Irregular channel flow

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An immersed edge-based smoothed finite element method with the stabilized pressure gradient projection for fluid-structure interaction

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COMPUTERS & structureS 2022年 270卷

作者： Wang, G. Hong, Y. Huo, S. H. Jiang, C. Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China Taiyuan Univ Technol Coll Aeronaut & Astronaut Taiyuan 030024 Peoples R China Cent South Univ Sch Traff & Transportat Engn Key Lab Traff Safety Track Minist Educ Changsha 410076 Peoples R China

In this paper, an effective and stable immersed edge-based smoothed finite element method (IES-FEM) is presented for fluid-structure interaction (FSI) problems. Under the framework of immersed algorithm, the system equation can be decomposed into three components, i.e, equations of nonlinear structure, incompressible viscous fluid, and FSI force. The characteristic-based split (CBS) scheme is first used to alleviate the spatial oscillation in the Navier-Stokes (N-S) equation. After that, the second-order pressure accuracy is formulated in the original CBS via stabilized pressure gradient projection (SPGP). Then, the problem domains are discretized using the simplest three-node triangular element and the smoothing domains are established. In order to enhance the accuracy of lower-order interpolation, the edge based smoothing operation is further performed on all gradient-related terms for structure and fluid, namely, the coupled ES/ES-FEM. Moreover, an accurate form of FSI force evaluation is developed by introducing the whole function that considers the pressure and viscous force on the interface. Numerical examples demonstrate that the proposed scheme has higher computational precision (even for distorted mesh), faster convergence rate, good robustness, and lower computed costs.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： Numerical methods Characteristic-based split scheme Stabilized by pressure gradient projection Edge-based smoothed finite element method Gradient smoothing technique fluid-structure interaction

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An immersed finite element material point (IFEMP) method for free surface fluid-structure interaction problems

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 393卷 1页

作者： Li, Ming-Jian Lian, Yanping Zhang, Xiong Beijing Inst Technol Inst Adv Struct Technol Beijing 100081 Peoples R China Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China

The inherent nonlinearity of free surface fluid-structure interaction (FSI) problems challenges numerical methods in terms of efficiency and fidelity. In this article, we propose an immersed finite element material point method for the water entry fluid-structure interaction problems. In this method, the fluid domain is discretized by an improved incompressible material point method (iMPM) using both Eulerian and Lagrangian descriptions, while the solid domain is solved by finite element method (FEM). The interaction between the iMPM and FEM is handled by a sharp immersed interface approach. Moreover, weighted tracing points are designed to track the fluid-structure interface with a low time complexity;a particle rearranging method is developed to eliminate the numerical cavities, which are non-physical voids caused by the highly disordered particle distribution, from which the original iMPM for FSI problems suffers. Various free surface FSI problems are presented to demonstrate the accuracy and effectiveness of the proposed method. The computational results are compared with analytical, experimental, and simulation data from the literature, with good agreement in cases where such data is available. The proposed method is expected to be a powerful tool for free surface FSI problems. (C) 2022 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Multiphase flow Immersed boundary Water entry Material point method

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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 8017页

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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A reduced unified continuum formulation for vascular fluid-structure interaction

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 394卷 1页

作者： Lan, Ingrid S. Liu, Ju Yang, Weiguang Marsden, Alison L. Stanford Univ Dept Bioengn Stanford CA 94305 USA Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen 518055 Guangdong Peoples R China Southern Univ Sci & Technol Guangdong Hong Kong Macao Joint Lab Data Driven F Shenzhen 518055 Guangdong Peoples R China Stanford Univ Dept Pediat Cardiol Stanford CA 94305 USA Stanford Univ Inst Computat & Math Engn Stanford CA 94305 USA

We recently derived the unified continuum and variational multiscale formulation for fluid-structure interaction (FSI) using the Gibbs free energy as the thermodynamic potential. Restricting our attention to vascular FSI, we now reduce this formulation in arbitrary Lagrangian-Eulerian (ALE) coordinates by adopting three common modeling assumptions for the vascular wall. The resulting semi-discrete formulation, referred to as the reduced unified continuum formulation, achieves monolithic coupling of the FSI system in the Eulerian frame through a simple modification of the fluid boundary integral. While ostensibly similar to the semi-discrete formulation of the coupled momentum method introduced by Figueroa et al., its underlying derivation does not rely on an assumption of a fictitious body force in the elastodynamics sub-problem and therefore represents a direct simplification of the ALE method. Furthermore, uniform temporal discretization of the entire FSI system is performed via the generalized-alpha scheme. In contrast to the predominant approach yielding only first-order accuracy for pressure, we collocate both pressure and velocity at the intermediate time step to achieve uniform second-order temporal accuracy. In conjunction with quadratic tetrahedral elements, our methodology offers higher-order temporal and spatial accuracy for quantities of clinical interest, including pressure and wall shear stress. Furthermore, without loss of consistency, a segregated predictor multi-corrector algorithm is developed to preserve the same block structure as for the incompressible Navier-Stokes equations in the implicit solver's associated linear system. Block preconditioning of a monolithically coupled FSI system is therefore made possible for the first time. Compared to alternative preconditioners, our three-level nested block preconditioner, which achieves improved representation of the Schur complement, demonstrates robust performance over a wide range of physical param

关键词： fluid-structure interaction Unified continuum formulation Variational multiscale method Nested block preconditioner Womersley solution Patient-specific hemodynamics

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