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fluid-structure interaction Study of the Splitter Plate in Turbine-Based Combined-Cycle Inlet System

JOURNAL OF AEROSPACE ENGINEERING 2017年第4期30卷 1-12页

作者： Qin, Qihao Xu, Jinglei Guo, Shuai Nanjing Univ Aeronaut & Astronaut Jiangsu Prov Key Lab Aerosp Power Syst Nanjing 210016 Jiangsu Peoples R China

A splitter plate is a key component of the inlet system in turbine-based combined-cycle engines, which divides the whole captured air flow into different engines, namely turbojet and ramjet. The aerodynamic force acting on the thin splitter plate with a single pivot may engender vibration and, in turn, flow-field variations at the start and end of the mode transition phase. A loosely-coupled method was used to simulate the process of fluid-structure interaction. The results showed that the deformation of the splitter plate is, in fact, a process in which the elastic restoring force struggles against the aerodynamic force under the action of damping. At turbojet mode, the splitter plate can attain the maximum displacement of 7.20 mm. The terminal shock was observed to move back and forth in the flowpath. The mass flow rate in turbojet and ramjet flowpaths varied by 5.91 and 44.34%, respectively. At ramjet mode, the inlet fell into the unstart state with a greater displacement of 8.95 mm. The mass flow rate in turbojet and ramjet flowpaths, and slot-coupled cavity varied by 1.69, 23.91, and 51.85%, respectively. (C) 2017 American Society of Civil Engineers.

关键词： Splitter plate Turbine-based combined-cycle fluid-structure interaction Inlet unstart

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A stabilised immersed framework on hierarchical b-spline grids for fluid-flexible structure interaction with solid-solid contact

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2018年 335卷 472-489页

作者： Kadapa, C. Dettmer, W. G. Peric, D. Swansea Univ Coll Engn Zienkiewicz Ctr Computat Engn Fabian Way Swansea SA1 8EN W Glam Wales

We present a robust and efficient stabilised immersed framework for fluid-structure interaction involving incompressible fluid flow and flexible structures undergoing large deformations and also involving solid-solid contact. The efficiency of the formulation stems from the use of second-order accurate sequential staggered solution scheme for resolving fluid-solid coupling. Mixed Galerkin formulation, along with SUPG/PSPG stabilisation, is employed to obtain the numerical solutions of the incompressible Navier-Stokes equations. The immersed formulation is based on hierarchical b-spline grids, with unsymmetric Nitsche method employed to impose boundary as well as interface conditions on the fluid domain, while ghost-penalty operators are applied to alleviate the numerical instabilities arising due to small cut cells. The solid is modelled using linear continuum elements with finite strain formulation to facilitate the modelling of large structural deformations, and the contact between solids is modelled using the normal frictionless node-to-segment contact elements with Lagrange multipliers. In order to deal with the issue of uncovering for cut-cell based numerical schemes, a simple mapping technique is also introduced. Spatial and temporal convergence studies of the proposed scheme are performed by studying a simple example of flow over a deformable beam in cross flow. The robustness and accuracy of the proposed scheme are demonstrated by studying the benchmark examples of an oscillating beam in two-dimensions and flutter of a flexible simplified bridge deck in three-dimensions. In order to demonstrate the applicability of the proposed framework to complex fluid-structure interaction problems, the proposed methodology is used to simulate the fluid-structure interaction of a check valve with flexible valve plate. (C) 2018 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Hierarchical b-splines Immersed boundary methods Staggered scheme Nitsche method Check valve

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Dacron graft as replacement to dissected aorta: A three-dimensional fluid structure-interaction analysis

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JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 2018年 78卷 329-341页

作者： Jayendiran, R. Nour, B. M. Ruimi, A. Texas A&M Univ Qatar Mech Engn Program Doha Qatar Weill Cornell Med Coll Qatar Doha Qatar

Aortic dissection (AD) is a serious medical condition characterized by a tear in the intima, the inner layer of the aortic walls. In such occurrence, blood is being diverted to the media (middle) layer and may result in patient death if not quickly attended. In the case where the diseased portion of the aorta needs to be replaced, one common surgical technique is to use a graft made of Dacron, a synthetic fabric. We investigate the response of a composite human aortic segment-Dacron graft structure subjected to blood flow using the three-dimensional fluid-structure-interaction (FSI) capability in Abaqus. We obtain stress and strain profiles in each of the three layers of the aortic walls as well as in the Dacron graft. Results are compared when elastic and hyperelastic models are used and when isotropy vs. anisotropy is assumed. The more complex case (hyperelastic-anisotropy) is represented by the Holzapfel-Gasser-Ogden (HGO) model which also accounts for the orientation of the fibers present in the tissues. The fluid flow is taken as Newtonian, incompressible, pulsatile and turbulent. The simulation show that for all the cases, the von Mises stress distribution at aorta-Dacron interface is well below the ultimate strength of the aorta. No significant change in radial displacement at the interface of the two materials due to blood flow is observed. Computation cost is also addressed and results show that the hyperelastic-anisotropic model takes about three times longer to run than the elastic isotropic case. Trade-off between accuracy and computational cost has to be weighted.

关键词： Aortic dissection Dacron graft fluid-structure interaction Deformable walls Composite shell

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Overall performance optimization of a spiral pipe type heater by fluid- structure interaction modeling and partitioning screening method

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CASE STUDIES IN THERMAL ENGINEERING 2018年 11卷 89-97页

作者： Guo, Lei Li, Guofeng Liu, Yu Zhang, Ganqing Wu, Zechao Changsha Univ Sch Mech & Elect Engn Changsha Hunan Peoples R China

A spiral pipe type heater is applied to the natural gas transportation system to inhibit gas hydrate, but fracture failure often happens at the joint of a coil pipe and a gathering pipe. To understand the mechanical behavior of the spiral pipe heater, a mechanical model of the coil pipe acted by the gas fluid is constructed, and the mechanical characteristics of the fracture point are obtained by numerical calculation. Then, the relation between angle parameters and the axial force, shear force, bending moment as well as stress of the structure is gotten. Comparison calculations of heat exchange before and after structural adjustment are done to get the optimized structure parameters of better mechanical properties and high heating rate. From this study, it is found that although the mechanical properties are improved, when increasing an angle parameter, the heat transfer performance is decreased. A coordination method is used for resolving the contradiction between heat transfer performance and mechanical properties to get an overall performance optimization. The provided partitioning screening method can improve the heating efficiency and mechanical properties of the heater obviously and conveniently.

关键词： structure optimization fluid-structure interaction Mechanical modeling Flow assurance Heat exchange

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Three-Dimensional fluid-structure interaction Case Study on Cubical fluid Cavity with Flexible Bottom

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Journal of Marine Science and Application 2017年第4期16卷 382-394页

作者： Stefano Ghelardi Cesare Rizzo Diego Villa DITEN - Polo Navale Università degli Studi di Genova via Montallegro Genova 1 I-16145 Italy

In this paper, we report our study on a numerical fluid-structure interaction problem originally presented by Mok et al.(2001) in two dimensions and later studied in three dimensions by Valdés Vazquez(2007), Lombardi(2012), and Trimarchi(2012). We focus on a 3D test case in which we evaluated the sensitivity of several input parameters on the fluid and structural results. In particular, this analysis provides a starting point from which we can look deeper into specific aspects of these simulations and analyze more realistic cases, e.g., in sails design. In this study, using the commercial software ADINATM, we addressed a well-known unsteadiness problem comprising a square box representing the fluid domain with a flexible bottom modeled with structural shell elements. We compared data from previously published work whose authors used the same numerical approach, i.e., a partitioned approach coupling a finite volume solver(for the fluid domain) and a finite element solver(for the solid domain). Specifically, we established several benchmarks and made comparisons with respect to fluid and solid meshes, structural element types, and structural damping, as well as solution algorithms. Moreover, we compared our method with a monolithic finite element solution method. Our comparisons of new and old results provide an outline of best practices for such simulations.

关键词： fluid-structure interaction benchmark finite volume method finite element method partitioned monolithic ADINA^(TM)

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Dealing with the Effect of Air in fluid structure interaction by Coupled SPH-FEM Methods

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MATERIALS 2019年第7期12卷 1162-1162页

作者： Fragassa, Cristiano Topalovic, Marko Pavlovic, Ana Vulovic, Snezana Univ Bologna Dept Ind Engn Viale Risorgimento 2 I-40136 Bologna Italy Univ Kragujevac Fac Engn Sestre Janjic 6 Kragujevac 34000 Serbia

Smoothed particle hydrodynamics (SPH) and the finite element method (FEM) are often combined with the scope to model the interaction between structures and the surrounding fluids (FSI). There is the case, for instance, of aircrafts crashing on water or speedboats slamming into waves. Due to the high computational complexity, the influence of air is often neglected, limiting the analysis to the interaction between structure and water. On the contrary, this work aims to specifically investigate the effect of air when merged inside the fluid-structure interaction (FSI) computational models. Measures from experiments were used as a basis to validate estimations comparing results from models that include or exclude the presence of air. Outcomes generally showed a great correlation between simulation and experiments, with marginal differences in terms of accelerations, especially during the first phase of impact and considering the presence of air in the model.

关键词： fluid-structure interaction SPH FEM water impact air effect drop test

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Time-dependent fluid-structure interaction

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MATHEMATICAL METHODS IN THE APPLIED SCIENCES 2017年第2期40卷 486-500页

作者： Hsiao, George C. Sayas, Francisco-Javier Weinacht, Richard J. Univ Delaware Dept Math Sci Newark DE 19716 USA

The problem of determining the manner in which an incoming acoustic wave is scattered by an elastic body immersed in a fluid is one of the central importance in detecting and identifying submerged objects. The problem is generally referred to as a fluid-structure interaction and is mathematically formulated as a time-dependent transmission problem. In this paper, we consider a typical fluid-structure interaction problem by using a coupling procedure that reduces the problem to a nonlocal initial-boundary problem in the elastic body with a system of integral equations on the interface between the domains occupied by the elastic body and the fluid. We analyze this nonlocal problem by the Lubich approach via the Laplace transform, an essential feature of which is that it works directly on data in the time domain rather than in the transformed domain. Our resultsmay serve as a mathematical foundation for treating time-dependent fluid-structure interaction problems by convolution quadrature coupling of FEM and BEM. Copyright (C) 2015 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction coupling procedure Kirchhoff representation formula retarded potential Laplace transform boundary integral equation variational formulation Sobolev space

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fluid-structure interaction modelling of a PWR fuel assembly subjected to axial flow

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JOURNAL OF fluidS AND structureS 2016年第0期62卷 156-171页

作者： Ricciardi, Guillaume CEA CADARACHE DEN DTN STCPLHC F-13108 St Paul Les Durance France

Nuclear industry needs tools to design reactor cores in case of earthquake. A fluid-structure model simulating the response of the core to a seismic excitation has been developed. Full scale tests considering one fuel assembly are performed to identify coefficients (added mass and damping) that will be used as inputs in the models. Tests showed that the axial water flow induced an added stiffness. In the paper, an expression of the model accounting for the fluid in the fuel assembly with a porous media model and in the by-passes with a leakage flow model is developed. Numerical simulations are compared to experiments and showed good agreement. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Fuel assembly Modelling fluid-structure interaction Added stiffness

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fluid-structure interaction computations for geometrically resolved rotor simulations using CFD

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WIND ENERGY 2016年第12期19卷 2205-2221页

作者： Heinz, Joachim C. Sorensen, Niels N. Zahle, Frederik Tech Univ Denmark Dept Wind Energy Riso CampusFrederiksborgvej 399 DK-4000 Roskilde Denmark

This paper presents a newly developed high-fidelity fluid-structure interaction simulation tool for geometrically resolved rotor simulations of wind turbines. The tool consists of a partitioned coupling between the structural part of the aero-elastic solver HAWC2 and the finite volume computational fluid dynamics (CFD) solver EllipSys3D. The paper shows that the implemented loose coupling scheme, despite a non-conservative force transfer, maintains a sufficient numerical stability and a second-order time accuracy. The use of a strong coupling is found to be redundant. In a first test case, the newly developed coupling between HAWC2 and EllipSys3D (HAWC2CFD) is utilized to compute the aero-elastic response of the NREL 5-MW reference wind turbine (RWT) under normal operational conditions. A comparison with the low-fidelity but state-of-the-art aero-elastic solver HAWC2 reveals a very good agreement between the two approaches. In a second test case, the response of the NREL 5-MW RWT is computed during a yawed and thus asymmetric inflow. The continuous good agreement confirms the qualities of HAWC2CFD but also illustrates the strengths of a computationally cheaper blade element momentum theory (BEM) based solver, as long as the solver is applied within the boundaries of the employed engineering models. Two further test cases encompass flow situations, which are expected to exceed the limits of the BEM model. However, the simulation of the NREL 5-MW RWT during an emergency shut down situation still shows good agreements in the predicted structural responses of HAWC2 and HAWC2CFD since the differences in the computed force signals only persist for an insignificantly short time span. The considerable new capabilities of HAWC2CFD are finally demonstrated by simulating vortex-induced vibrations on the DTU 10-MW wind turbine blade in standstill. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction FSI loose coupling aeroelasticity full rotor simulations CFD standstill vibrations HAWC2CFD

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fluid-structure interaction Model of a Percutaneous Aortic Valve: Comparison with an In Vitro Test and Feasibility Study in a Patient-Specific Case

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ANNALS OF BIOMEDICAL ENGINEERING 2016年第2期44卷 590-603页

作者： Wu, Wei Pott, Desiree Mazza, Beniamino Sironi, Tommaso Dordoni, Elena Chiastra, Claudio Petrini, Lorenza Pennati, Giancarlo Dubini, Gabriele Steinseifer, Ulrich Sonntag, Simon Kuetting, Maximilian Migliavacca, Francesco Politecn Milan Lab Biol Struct Mech Dept Chem Mat & Chem Engn Giulio Natta Piazza Leonardo Vinci 32 I-20133 Milan Italy Rhein Westfal TH Aachen Dept Cardiovasc Engn Inst Appl Med Engn Helmholtz Inst Aachen Germany Erasmus Univ Med Ctr Dept Biomed Engn Thoraxctr Rotterdam Netherlands Politecn Milan Dept Civil & Environm Engn I-20133 Milan Italy

Transcatheter aortic valve replacement (TAVR) represents an established recent technology in a high risk patient base. To better understand TAVR performance, a fluid-structure interaction (FSI) model of a self-expandable transcatheter aortic valve was proposed. After an in vitro durability experiment was done to test the valve, the FSI model was built to reproduce the experimental test. Lastly, the FSI model was used to simulate the virtual implant and performance in a patient-specific case. Results showed that the leaflet opening area during the cycle was similar to that of the in vitro test and the difference of the maximum leaflet opening between the two methodologies was of 0.42%. Furthermore, the FSI simulation quantified the pressure and velocity fields. The computed strain amplitudes in the stent frame showed that this distribution in the patient-specific case is highly affected by the aortic root anatomy, suggesting that the in vitro tests that follow standards might not be representative of the real behavior of the percutaneous valve. The patient-specific case also compared in vivo literature data on fast opening and closing characteristics of the aortic valve during systolic ejection. FSI simulations represent useful tools in determining design errors or optimization potentials before the fabrication of aortic valve prototypes and the performance of tests.

关键词： fluid-structure interaction Valve mechanics Mathematical models Stent Transcatheter aortic valve

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