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Hydroelastic analysis of hull slamming coupling lattice Boltzmann and finite element methods

COMPUTERS & structureS 2014年 138卷 24-35页

作者： De Rosis, Alessandro Falcucci, Giacomo Porfiri, Maurizio Ubertini, Francesco Ubertini, Stefano Univ Bologna DICAM I-40136 Bologna Italy Univ Naples Parthenope Dept Technol I-80143 Naples Italy NYU Polytech Sch Engn Dept Mech & Aerosp Engn Brooklyn NY 11201 USA Univ Tuscia DEIM Ind Engn Sch I-01100 Viterbo Italy

We propose a computational approach to study the response of compliant structures to impulsive loading due to impact on the free surface of a weakly compressible viscous fluid. The fluid flow is analyzed through the lattice Boltzmann method and the structural response by the finite element method. The time discontinuous Galerkin method is used to integrate the structural dynamics in time, and an explicit coupling strategy with the same time-step for the fluid and the solid is employed. Numerical results are compared to analytical and experimental findings for rigid and compliant wedges. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Finite element method fluid-structure interaction Hull slamming Lattice Boltzmann method

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fluid-Thermal-Structural Coupled Analysis of a Radial Inflow Micro Gas Turbine Using Computational fluid Dynamics and Computational Solid Mechanics

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MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-10页

作者： Xie, Yonghui Lu, Kun Liu, Le Xie, Gongnan Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Shaanxi Peoples R China Northwestern Polytech Univ Sch Mech Engn Xian 710072 Shaanxi Peoples R China

A three-dimensional fluid-thermal-structural coupled analysis for a radial inflow micro gas turbine is conducted. First, a fluid-thermal coupled analysis of the flow and temperature fields of the nozzle passage and the blade passage is performed by using computational fluid dynamics (CFD). The flow and heat transfer characteristics of different sections are analyzed in detail. The thermal load and the aerodynamic load are then obtained from the temperature field and the pressure distribution. The stress distributions of the blade are finally studied by using computational solid mechanics (CSM) considering three cases of loads: thermal load, aerodynamics load combined with centrifugal load, and all the three types of loads. The detailed parameters of the flow, temperature, and the stress are obtained and analyzed. The numerical results obtained provide a useful knowledge base for further exploration of radial gas turbine design.

关键词： COMPUTATIONAL fluid dynamics fluid-structure interaction SOLID mechanics TEMPERATURE effect AERODYNAMIC load RADIAL inflow turbines

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Assessment of the seismic effect of insulation on extra-large cryogenic liquid natural gas storage tanks

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JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES 2014年第1期30卷 9-16页

作者： Zhang, Ruifu Weng, Dagen Tongji Univ Res Inst Struct Engn & Disaster Reduct Shanghai 200092 Peoples R China

Insulation is typically used in extra-large double-walled cryogenic storage tanks that are used to store liquid natural gas (LNG). These vessels have been designed with the assumption that the insulation offers negligible structural resistance that might cause structural damage. Observation of the deformation of the insulation in such tanks leads to concern that the insulation may become sufficiently compacted to cause significant load transfer between the inner and outer tank. The inner tank, though protected from most external events by the outer tank, is only designed to contain the liquid gas. It is therefore much more sensitive to seismic effects. In this investigation, simplified and 3D finite element models are used to simulate the interaction effects of the fluid, inner tank, insulation and outer tank. This paper presents an initial analysis of the potential effects of LNG tank insulation under earthquake conditions and assesses the potential for structural damage by comparison of models that do or do not consider the insulation layer. The data reported and statistically sorted include the overturning moment, the base shear, the tank wall stress, and the wave height in the tank. The results show that the insulation layer has certain influence on seismic design of LNG tanks. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Tank fluid-structure interaction LNG Earthquake Seismic Insulation

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Partitioned subiterative coupling schemes for aeroelasticity using combined interface boundary condition method

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INTERNATIONAL JOURNAL OF COMPUTATIONAL fluid DYNAMICS 2014年第6-10期28卷 272-300页

作者： He, Tao Zhou, Dai Han, Zhaolong Tu, Jiahuang Ma, Jin Shanghai Jiao Tong Univ Sch Naval Architecture Ocean & Civil Engn Dept Civil Engn Shanghai 200030 Peoples R China Shanghai Jiao Tong Univ Dept Naval Architecture & Ocean Engn State Key Lab Ocean Engn Shanghai 200030 Peoples R China

The combined interface boundary condition (CIBC) method has been recently proposed for fluid-structure interaction. The CIBC method employs a Gauss-Seidel-like procedure to transform traditional interface conditions into velocity and traction corrections whose effect is controlled by a dimensional parameter. However, the original CIBC method has to invoke the uncorrected traction when forming the traction correction. This process limits its application to fluid-rigid body interaction. To repair this drawback, a new formulation of the CIBC method has been developed by using a new coupling parameter. The reconstruction is simple and the structural traction is removed completely. Two partitioned subiterative coupling versions of the CIBC method are developed. The first scheme is an implicit strategy while the second one is a semi-implicit strategy. Iterative loops are actualised by the fixed-point algorithm with Aitken accelerator. The obtained results agree with the well-documented data, and some famous flow phenomena have been successfully detected.

关键词： combined interface boundary condition method aeroelasticity partitioned subiterative coupling scheme fluid-structure interaction finite element method

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FSI modeling with the DSD/SST method for the fluid and finite difference method for the structure

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COMPUTATIONAL MECHANICS 2014年第2期54卷 581-589页

作者： Tian, Fang-Bao Univ New S Wales Sch Engn & Informat Technol Canberra ACT 2600 Australia

We present a fluid-structure interaction (FSI) modeling method based on using the deforming-spatial-domain/stabilized space-time (DSD/SST) method for the fluid mechanics part and a finite difference (FD) method for the structural mechanics part. As the structural mechanics model, we focus on the thin-shell model. The fluid mechanics equations with moving boundaries are solved with the DSD/SST method and the thin-shell structural mechanics equation is solved with a FD method, with partitioned coupling between the two parts. The coupling of the DSD/SST and FD solvers makes sure that the boundary conditions on the fluid-structure interface at the end of each time step are matched between the fluid and the structure. A hanging plate in vacuum under gravitational force is performed to validate the structure solver. In addition, a pitching plate in a uniform flow is simulated to validate the FSI solver. The present results are in reasonable agreement with data predicted by other methods.

关键词： DSD/SST method FD method fluid-structure interaction Thin-shell structure

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A lattice Boltzmann model for multiphase flows interacting with deformable bodies

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ADVANCES IN WATER RESOURCES 2014年 73卷 55-64页

作者： De Rosis, Alessandro Univ Bologna Dept Agr Sci DIPSA I-40127 Bologna Italy

In this paper, a numerical model to simulate a multiphase flow interacting with deformable solid bodies is proposed. The fluid domain is modeled through the lattice Boltzmann method and the Shan-Chen model is adopted to handle the multiphase feature. The interaction of the flow with immersed solid bodies is accounted for by using the Immersed Boundary method. Corotational beam finite elements are used to model the deformable bodies and non-linear structure dynamics is predicted through the Time Discontinuous Galerkin method. A numerical campaign is carried out in order to assess the effectiveness and accuracy of the proposed modeling by involving different scenarios. In particular, the model is validated by performing the bubble test and by comparing present results with the ones from a numerical commercial software. Moreover, the properties in terms of convergence are discussed. In addition, the effectiveness of the proposed methodology is evaluated by computing the error in terms of the energy that is artificially introduced in the system at the fluid-solid interface. Present findings show that the proposed approach is robust, accurate and suitable of being applied to a lot of practical applications involving the interaction between multiphase flows and deformable solid bodies. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Multiphase flow Lattice Boltzmann method fluid-structure interaction

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Analysis of the wake dynamics of stiff and flexible cantilever beams using POD and DMD

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COMPUTERS & fluidS 2014年 101卷 27-41页

作者： Cesur, A. Carlsson, C. Feymark, A. Fuchs, L. Revstedt, J. Lund Univ SE-22100 Lund Sweden Chalmers Univ Technol SE-41296 Gothenburg Sweden

The wake flow behind a cantilever beam of quadratic cross-section at a Reynolds number of 50,000 is investigated using detailed simulations. Two cases are considered, the first one using a stiff beam and the second one with a beam allowing for elastic deformation due to the hydrodynamic forces. The flow is simulated using an implicit large eddy simulation (ILES) approach in OpenFOAM and the structural deformation of the beam is found from a non-linear finite element approach using OOFEM. The motion of the fluid mesh due to the structural deformation is handled by an ALE method. The wake structures are investigated using proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) of the flow field. The results show that apart from the wake structures originating from the vortex shedding there is also a low frequency mode, which is an oscillatory motion in the stream-wise direction, present. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Wake flow Large eddy simulation

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A 2D Mathematical Model of Blood Flow and its interactions in an Atherosclerotic Artery

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MATHEMATICAL MODELLING OF NATURAL PHENOMENA 2014年第6期9卷 46-68页

作者： Boujena, S. Kafi, O. El Khatib, N. Univ Hassan II Casablanca Fac Sci Casablanca Morocco Lebanese Amer Univ Dept Math & Comp Sci Byblos Lebanon

A stenosis is the narrowing of the artery, this narrowing is usually the result of the formation of an atheromatous plaque infiltrating gradually the artery wall, forming a bump in the ductus arteriosus. This arterial lesion falls within the general context of atherosclerotic arterial disease that can affect the carotid arteries, but also the arteries of the heart (coronary), arteries of the legs (PAD), the renal arteries. It can cause a stroke (hemiplegia, transient paralysis of a limb, speech disorder, sailing before the eye). In this paper we study the blood-plaque and blood-wall interactions using a fluid-structure interaction model. We first propose a 2D analytical study of the generalized Navier-Stokes equations to prove the existence of a weak solution for incompressible non-Newtonian fluids with non standard boundary conditions. Then, coupled, based on the results of the theoretical study approach is given. And to form a realistic model, with high accuracy, additional conditions due to fluid-structure coupling are proposed on the border undergoing inetraction. This coupled model includes (a) a fluid model, where blood is modeled as an incompressible non-Newtonian viscous fluid, (b) a solid model, where the arterial wall and atherosclerotic plaque will be treated as non linear hyperelastic solids, and (c) a fluid-structure interaction (FSI) model where interactions between the fluid (blood) and structures (the arterial wall and atheromatous plaque) are conducted by an Arbitrary Lagrangian Eulerian (ALE) method that allows accurate fluid-structure coupling.

关键词： stenosed artery atheromatous plaque blood flow non-Newtonian fluid fluid-structure interaction generalized Navier-Stokes equations boundary conditions

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Dynamic compression of foam supported plates impacted by high velocity soil

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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2014年 63卷 88-105页

作者： Liu, T. Wadley, H. N. G. Deshpande, V. S. Univ Cambridge Dept Engn Cambridge CB2 1PZ England Univ Virginia Sch Engn & Appl Sci Dept Mat Sci & Engn Charlottesville VA 22903 USA

The response of back-supported buffer plates comprising a solid face sheet and foam core backing impacted by a column of high velocity particles (sand slug) is investigated via a lumped parameter model and coupled discrete/continuum simulations. The buffer plate is either resting on (unattached) or attached to a rigid stationary foundation. The lumped parameter model is used to construct maps of the regimes of behaviour with axes of the ratio of the height of the sand slug to core thickness and the normalised core strength. Four regimes of behaviour are identified based on whether the core compression ends prior to the densification of the sand slug or vice versa. Coupled discrete/continuum simulations are also reported and compared with the lumped parameter model. While the model predicted regimes of behaviour are in excellent agreement with numerical simulations, the lumped parameter model is unable to predict the momentum transmitted to the supports as it neglects the role of elasticity in both the buffer plate and the sand slug. The numerical calculations show that the momentum transfer is minimised for intermediate values of the core strength when the so-called "soft-catch" mechanism is in play. In this regime the bounce-back of the sand slug is minimised which reduces the momentum transfer. However, in this regime, the impulse reduction is small (less than 10% of that transferred to a rigid structure). For high values of the core strength, the response of the buffer plate resembles a rigid plate with nearly no impulse mitigation while at low values of core strength, a slap event occurs when the face sheet impinges against the foundation due to full densification of the foam core. This slap event results in a significant enhancement of the momentum transfer to the foundation. The results demonstrate that appropriately designed buffer plates have potential as impulse mitigators in landmine loading situations. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Discrete/continuum coupling Dynamic loading

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A computational model of blast loading on the human eye

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2014年第1期13卷 123-140页

作者： Bhardwaj, Rajneesh Ziegler, Kimberly Seo, Jung Hee Ramesh, K. T. Nguyen, Thao D. Indian Inst Technol Dept Mech Engn Bombay 400076 Maharashtra India Johns Hopkins Univ Dept Mech Engn Baltimore MD 21218 USA

Ocular injuries from blast have increased in recent wars, but the injury mechanism associated with the primary blast wave is unknown. We employ a three-dimensional fluid-structure interaction computational model to understand the stresses and deformations incurred by the globe due to blast overpressure. Our numerical results demonstrate that the blast wave reflections off the facial features around the eye increase the pressure loading on and around the eye. The blast wave produces asymmetric loading on the eye, which causes globe distortion. The deformation response of the globe under blast loading was evaluated, and regions of high stresses and strains inside the globe were identified. Our numerical results show that the blast loading results in globe distortion and large deviatoric stresses in the sclera. These large deviatoric stresses may be indicator for the risk of interfacial failure between the tissues of the sclera and the orbit.

关键词： Blast injury fluid-structure interaction Ocular biomechanics Immersed boundary method Sclera

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