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3D fluid-structure interaction analysis of a typical liquid rocket engine cycle based on a novel viscoplastic damage model

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2013年第13期94卷 1165-1190页

作者： Kowollik, D. Tini, V. Reese, S. Haupt, M. Braunschweig Univ Technol Inst Aircraft Design & Lightweight Struct D-38108 Braunschweig Germany Rhein Westfal TH Aachen Inst Appl Mech D-52074 Aachen Germany

In many space missions, expandable or reusable launch systems are used. In this context, the reliable design of liquid rocket engines (LREs) is a key issue. In the present paper, we present a novel combination of numerical schemes. It is applied to model the extreme physical phenomena a typical LRE undergoes during its loading cycles. The numerical scheme includes a partitioned fluid-structure interaction (FSI) algorithm in combination with a unified viscoplastic damage model. This allows the complex description of the material response under cyclic thermomechanical loading taking place in LREs. In this regard, we focus on the response of the cooling channel wall that is made from copper alloys. For the coupled FSI analysis, the individual domains of the rocket thrust chamber are modeled by a 3D parametrized approach. The well-established single field solver codes, DLR TAU for the hot gas and ABAQUS FE software for the structural domain, are coupled via the inhouse developed simulation environment ifls. Ifls provides the necessary algorithms for a partitioned coupling approach such as individual code steering, data interpolation, time integration and iteration control. Finally, the results of an FSI analysis of a complete engine cycle are presented. They show the potential of the new numerical scheme for the lifetime prediction of *** (c) 2013 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction FEMs damage viscoplasticity Navier-Stokes

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Investigation of prescribed movement in fluid-structure interaction simulation for the human phonation process

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COMPUTERS & fluidS 2013年第100期86卷 133-140页

作者： Zoerner, S. Kaltenbacher, M. Doellinger, M. Vienna Univ Technol Inst Mech & Mechatron Vienna Austria Univ Erlangen Nurnberg Dept Phoniatr & Pediat Nurnberg Germany

In a partitioned approach for computational fluid-structure interaction (FSI) the coupling between fluid and structure causes substantial computational resources. Therefore, a convenient alternative is to reduce the problem to a pure flow simulation with preset movement and applying appropriate boundary conditions. This work investigates the impact of replacing the fully-coupled interface condition with a one-way coupling. To continue to capture structural movement and its effect onto the flow field, prescribed wall movements from separate simulations and/or measurements are used. As an appropriate test case, we apply the different coupling strategies to the human phonation process, which is a highly complex interaction of airflow through the larynx and structural vibration of the vocal folds (VF). We obtain vocal fold vibrations from a fully-coupled simulation and use them as input data for the simplified simulation, i.e. just solving the fluid flow. All computations are performed with our research code CPS++, which is based on the finite element (FE) method. The presented results show that a pure fluid simulation with prescribed structural movement can substitute the fully-coupled approach. However, caution must be used to ensure accurate boundary conditions on the interface, and we found that only a pressure driven flow correctly responds to the physical effects when using specified motion. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Prescribed boundary conditions Finite element method

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Numerical simulation on fluid-structure interaction of wind around super-tall building at high reynolds number conditions

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STRUCTURAL ENGINEERING AND MECHANICS 2013年第2期46卷 197-212页

作者： Huang, Shenghong Li, Rong Li, Q. S. Univ Sci & Technol China Sch Engn Sci Hefei 230026 Peoples R China City Univ Hong Kong Dept Bldg & Construct Kowloon Hong Kong Peoples R China

With more and more high-rise building being constructed in recent decades, bluff body flow with high Reynolds number and large scale dimensions has become an important topic in theoretical researches and engineering applications. In view of mechanics, the key problems in such flow are high Reynolds number turbulence and fluid-solid interaction. Aiming at such problems, a parallel fluid-structure interaction method based on socket parallel architecture was established and combined with the methods and models of large eddy simulation developed by authors recently. The new method is validated by the full two-way FSI simulations of 1:375 CAARC building model with Re = 70000 and a full scale Taipei101 high-rise building with Re = 1e8, The results obtained show that the proposed method and models is potential to perform high-Reynolds number LES and high-efficiency two-way coupling between detailed fluid dynamics computing and solid structure dynamics computing so that the detailed wind induced responses for high-rise buildings can be resolved practically.

关键词： fluid-structure interaction computational fluid dynamics computational structural dynamics large Eddy simulation tall building wind effect

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A finite-element/boundary-element method for large-displacement fluid-structure interaction with potential flow

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2013年 266卷 57-69页

作者： van Opstal, T. M. van Brummelen, E. H. Eindhoven Univ Technol NL-5600 MB Eindhoven Netherlands

This work concerns the interaction of light membrane structures enclosing incompressible fluids. Large displacements and collapsed boundaries (initially slender subdomains) are characteristic of this class of problems. A finite-element/boundary-element (FE/BE) coupled discretization is presented as an enabling technology, addressing these challenges by avoiding volumetric meshing as required by arbitrary Lagrangian Eulerian or immersed boundary type methods. The presented formulation includes a compatibility condition, to which a physical interpretation is given;and a regularizing bending stiffness, observed to be necessary from both the theoretical (well-posedness) and numerical (stability) point of view. A cheap contact load is designed to deal with possibly complex geometries, reusing already computed discrete boundary element kernels. Numerical experiments show the capabilities of the proposed scheme. (C) 2013 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Inflatable structures Boundary element method (BEM) Strong coupling

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Impact of a tri-dimensional conical structure made of composite materials

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OCEAN ENGINEERING 2025年 315卷

作者： Calvario, M. Xu, H. T. Wang, S. Gaspar, J. F. Soares, C. Guedes Univ Lisbon Inst Super Tecn Ctr Marine Technol & Ocean Engn CENTEC Ave Rovisco Pais P-1049001 Lisbon Portugal

This paper investigates the impact strength of a three-dimensional conical structure constructed from composite materials, focusing on its application in wave energy converters. Two glass fibre-reinforced polymers, unidirectional and bi-axial stitched fabrics, are analysed. The study includes an experimental low-velocity impact of plates with solid objects, simulating low-velocity impact with floating debris, and an experimental bottom wave slamming test where the structure is dropped from a height of 1.5 m onto a calm water surface equivalent to an initial velocity of 5.43 (m/s). In addition, a destructive buckling test is carried out by applying pressure to the conical to assess the buckling strength of both laminates. Furthermore, the experimental buckling pressure failure is compared with the pressure peak determined by a numerical simulation, based on the Arbitrary Lagrangian Eulerian formulation, and with a design pressure suggested by a classification society recommended practice. Results demonstrate that the biaxial stitched fabric reveals a higher impact strength on both impacts with solids and fluids and a higher buckling strength. Moreover, the peak pressure determined by the numerical simulation is slightly higher than that a conservative design approach predicted.

关键词： Wave energy converter Arbitrary Lagrangian-Eulerian formulation Composite materials Wave slamming fluid-structure interaction

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Convolution neural network for fluid flow simulations in cascade with oscillating blades

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JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2025年 462卷

作者： Bublik, Ondrej Heidler, Vaclav Vimmr, Jan Univ West Bohemia Fac Appl Sci NTIS New Technol Informat Soc Tech 8 Plzen 30100 Czech Republic Univ West Bohemia Fac Appl Sci Dept Mech Tech 8 Plzen 30100 Czech Republic

This paper aims to design a computational model for simulating the unsteady flow field in a cascade of oscillating blades. The core of the new model is a convolutional neural network, which is trained on a simplified cascade consisting of three blades. The primary advantage lies in significantly reducing the computational cost, as the new model is several orders of magnitude faster than traditional CFD methods for evaluations, though training the model remains computationally intensive. The convolutional neural network can accurately predict the unsteady flow field, as demonstrated in validation examples. In the next step, a composition algorithm is proposed to combine several simplified cases, enabling the solution of a cascade with any number of blades.

关键词： Convolution neural network Unsteady fluid flow Blade cascade fluid-structure interaction

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Simulating flow-induced reconfiguration by coupling corotational plate finite elements with a simplified pressure drag

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EXTREME MECHANICS LETTERS 2025年 74卷

作者： Lamoureux, Danick Ramananarivo, Sophie Melancon, David Gosselin, Frederick P. Polytech Montreal Dept Mech Engn Lab Multiscale Mech LM2 2500 Chemin Polytech Montreal PQ H3T1J6 Canada Ecole Polytech Inst Polytech Paris LadHyX CNRS F-91120 Palaiseau France

Developing engineering systems that rely on flow-induced reconfiguration, the phenomenon where a structure deforms under flow to reduce its drag, requires design tools that can predict the behavior of these flexible structures. Current methods include using fully coupled computational fluid dynamics and finite element analysis solvers or highly specialized theories for specific geometries. Coupled numerical methods are computationally expensive to use and non-trivial to setup, while specialized theories are difficult to generalize and take a long time to develop. A compromise between speed, accuracy, and versatility is required to be implemented into the design cycle of flexible structures under flow. This paper offers anew numerical implementation of the pressure drag in the context of a corotational finite element formulation on MATLAB. The presented software is verified against different semi-analytical theories applied to slender plates and disks cut along their radii as well as validated against experiments on kirigami sheets and draping disks. Usage: The developed code and verification cases presented here are available on GitHub https://github. com/lm2-poly/FIRM.

关键词： fluid-structure interaction Finite element analysis Drag reduction by reconfiguration Geometric nonlinearities Wind on trees Flow-induced deformation

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Experimental observation on violent sloshing flows inside rectangular tank with flexible baffles

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APPLIED OCEAN RESEARCH 2025年 154卷

作者： Park, Taehyun Park, Cheon-Jin Lee, Jeoungkyu Kim, Yonghwan Seoul Natl Univ Dept Naval Architecture & Ocean Engn 599 Gwanak Ro Seoul 08826 South Korea Hyundai Heavy Ind Co Ltd Hyundai Maritime Res Inst Cargo Containment Res Dept 477 Bundangsuseo Ro Seongnam Si 13553 Gyeonggi Do South Korea

In this study, a series of sloshing model tests were conducted to observe the effects of an internal baffle in a rectangular tank and to secure basic data for future numerical calculations or applications to similar phenomena. The sloshing flows and flexible motions of two different baffles with hyper-elastic properties were observed and the results were compared with those of a non-flexible baffle. Experiments were conducted for different filling conditions, motion amplitudes, and excitation frequencies, with a particular focus on violent flow cases. The local flows around the baffles were captured using a high-speed camera, and the sloshing-induced impact pressures on the tank walls were measured. The present experiment showed strong interactions between flexible baffle motion and sloshing flows, particularly at motion frequencies higher than the natural sloshing frequency. The physical phenomena became more complicated when the free surface was closer to the baffle height. The data obtained in this study can be used as benchmark tests for numerical computation of strong-fluid interactions.

关键词： Sloshing fluid-structure interaction Hydroelasticity Flexible baffle Sloshing experiment

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A Coupled Eulerian Lagrangian method for modelling coupled hydro-geomechanical moored systems

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OCEAN ENGINEERING 2025年 327卷

作者： Dyson, Ashley P. Kefayati, Gholamreza Tolooiyan, Ali Univ Tasmania Sch Engn Computat Engn Sustainabil Lab CES Lab Hobart Australia

Understanding the response of floating structures to harsh waves and current loads is essential for the safe design and operation of coastal and marine anchors and foundations. A Coupled Eulerian Lagrangian large deformation technique is presented for simulating the complex fluid-structure interactions of semi-submerged moored floating structures, with the objective of developing coupled hydro-geotechnical models involving wave and current conditions, flexible moorings and embedded anchors. As a result of the hydro-geomechanical coupling, the impacts of environmental conditions on floating structures and foundation performance can be assessed. Furthermore, the role of anchor displacement in the motion of moored, floating structures can be considered. A semi-submerged floating box similar to a floating pontoon under wave loads is first considered, providing a strong agreement with laboratory tests. Thereafter, the method is extended to encompass combined wave and current loading regimes. The response of a moored floating buoy connected to an embedded anchor under wave and current loading is considered, providing a mechanism for assessing both the fluid and geotechnical behaviour of moored flexible floating offshore systems in a single monolithic simulation. As a result of the twoway hydro-geomechanical coupling, several mechanisms of anchor displacement can be observed, notably anchor heave, rotation and pivoting. Key features of the fully coupled model are the development of plastic strains surrounding anchor shaft in the direction of loading, as well as dynamic wave and current-driven soil deformation which are not readily considered in conventional static analyses.

关键词： Semi-submerged Moored structure Coupled Eulerian Lagrangian fluid-structure interaction

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Investigation into the impact damage behaviour of advanced ship-bridge impact mitigation devices utilising foam-filled composite sandwich panels

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SHIPS AND OFFSHORE structureS 2025年

作者： Wang, Jia-Xia Jin, Yi-Fan Zhang, Zi-Yang Liu, Kun Chen, Bai-qiao Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang 212100 Peoples R China Shanghai Waigaoqiao Shipbuilding Co Ltd Shanghai Peoples R China Univ Lisbon Ctr Marine Technol & Ocean Engn CENTEC Inst Super Tecn Lisbon Portugal

With transportation's rapid growth, ship-bridge collisions occur frequently, causing substantial losses. Ship-bridge anticollision facilities should not only protect the structural integrity of bridges but also minimise ship damage. This paper designs a novel ship-bridge anti-collision device based on a trapezoidal foam-filled composite sandwich structure. Using the finite element software LS-DYNA, a ship-anti-collision device-bridge collision model was established, taking into account pile-water-soil coupling. The study investigates the selection of box materials, filling materials and wall thickness for the novel anti-collision device. By analysing the damage characteristics of the ship, anti-collision device and pier under typical collision loads, the optimal material properties were determined. The impact resistance of the optimised device was evaluated under different ship speeds and collision angles, demonstrating that the novel anti-collision device exhibits excellent buffering and energy absorption, effectively reducing the peak collision force, extending the collision duration and reducing damage to the ship's bow structure.

关键词： Ship-bridge collision foam-filled composite sandwich structure vessel collision protection device fluid-structure interaction damage characteristics

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