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检索条件"任意字段=6th European Conference on Numerical Methods in Geotechnical Engineering"

共 818 条记录，以下是471-480 订阅

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the information-flux method: A true Petrov-Galerkin formulation based on maximum-entropy methods applied to convection-dominated problems

The information-flux method: A true Petrov-Galerkin formulat...

引用

6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Nissen, Keijo Gravemeier, Volker Wall, Wolfgang A. Institute for Computational Mechanic Technische Universität München Germany Emmy Noether Research Group Computational Multiscale Methods for Turbulent Combustion Boltzmannstr. 15 85748 Garching Germany

ISBN: (纸本)9783950353709

the information-flux method is proposed as a novel approach to stable methods. It is a meshfree Petrov-Galerkin formulation based on maximum-entropy basis functions. Stability is ensured by selected weighting functions resembling the information flux of the underlying physical problem. the novelties presented in this article concern the multi-dimensional formulation of the method, translating the good performance previously shown for one-dimensional problems. the use of non-negative weighting functions is key to the accomplishments demonstrated in this study. We present an approach based on two-dimensional freespace solution, which, in contrast to usual streamline approaches, takes two-dimensional effects of the convection into account. numerical results are shown for one- and two-dimensional convection-dominated convection-diffusion problems.

关键词： Galerkin methods

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BIEM analysis of a non-homogeneous plane containing multiple defects and swept by SH-waves

BIEM analysis of a non-homogeneous plane containing multiple...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Dineva, Petia S. Rangelov, Tsviatko V. Manolis, George D. Institute of Mechanics Bulgarian Academy of Sciences 1113 Sofia Bulgaria Institute of Informatics and Mathematics Bulgarian Academy of Sciences 1113 Sofia Bulgaria Department of Civil Engineering Aristotle University Thessaloniki GR-54124 Greece

ISBN: (纸本)9783950353709

In here, the anti-plane strain problem for a continuously inhomogeneous, anisotropic plane containing cavities and cracks and swept by an incident SH-wave is solved using a nonhypersingular, traction-based boundary integral equation method (BIEM). By employing a special functional transformation on the displacement, the original dynamic equilibrium equation with variable coefficients is reduced to one with constant coefficients. this allows the derivation of a frequency dependent fundamental solution in a closed form by the Radon transform. Subsequent implementation of this solution within a BIEM formulation yields an accurate and efficient numerical scheme. Some validation studies are first conducted, followed by extensive numerical simulations for a cavity-crack system in an exponentially inhomogeneous medium in which inhomogeneity can have any arbitrary direction within the elastic plane, i.e., vertical, lateral, etc.

关键词： Wave propagation

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numerical study of microchannel heat sink performance using nanofluids

Numerical study of microchannel heat sink performance using ...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Yang, Yue-Tzu Lin, Shih-Han Lai, Feng-Hsiang Wang, Yi-Hsien Department of Mechanical Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9783950353709

In this study, the microchannel heat sink (MCHS) performance using nanofluids as coolants is analyzed numerically and nanofluids are modeled using single and two phase approaches. the numerical predictions are validated with available experimental data in the literature. An orthogonal non-uniform staggered grid is used for the establishment of mesh grids. the parameters studied include the particle volume fraction ( φ=0.204%, 0.256%, 0.294% and 0.4% ) and the volumetric flow rate ( V=10mL min, 15mL min and 20mL min ). the numerical computations indicate that the results of the two phase approach are more accurate than the single phase approach. In the laminar flow case, the thermal resistance of nanofluids is smaller than that of water, which reduces as the particle volume fraction and the volumetric flow rate increase. In addition, the pressure drop of both nanofluid-cooled MCHS and pure water-cooled MCHS is discussed. For the case of laminar, the pressure drop for nanofluid-cooled MCHS slightly increased.

关键词： Computational fluid dynamics

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numerical and analytical determination of multispan cable Eigenfrequencies

Numerical and analytical determination of multispan cable Ei...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Ivanova, Olga A. Bauman Moscow State Technical University Applied Mathematics Department 2nd Baumanskaya st. 5 105005 Moscow Russia

ISBN: (纸本)9783950353709

Cable dynamics investigation involves determination of eigenfrequencies and eigenmodes of its small free oscillations. Eigenfrequencies and eigenmodes of small free in-plane oscillations of inextensible and extensible cables with fixed ends are well investigated;at the same time small oscillations of a multispan cable are not investigated thoroughly. Two methods of a cable lower eigenfrequencies and eigenmodes determination are described. In the first case, the sagittary function method is used which is based on numerical solution of Cauchy problems for ordinary differential equations describing the problem in order to compose its general solution. the second approach is mainly analytical, it uses some assumptions about parameters of a transmission line, e.g. that its sag-to-span ratio is small, and it's possible to construct algebraic equations for estimation of transmission line eigenfrequencies and eigenmodes. the results of calculations are in good agreement with known experimental and numerical data. In the special case of one-span line, i.e. for the cable with fixed ends, the algebraic equation derived using the proposed approach is similar to well-known equation.

关键词： Electric lines

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numerical analysis of hydrodynamic characteristics of wavy liquid films on rotating disks

Numerical analysis of hydrodynamic characteristics of wavy l...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Prieling, Doris Steiner, Helfried Brenn, Günter Graz University of Technology Institute of Fluid Mechanics and Heat Transfer Inffeldgasse 25/F A-8010 Graz Austria

ISBN: (纸本)9783950353709

Various industrial applications utilize spinning disk devices, where the working liquid, which is supplied by an impinging vertical jet, forms a thin film driven by the centrifugal acceleration. the strong disparity of the two governing length scales, which are the film height and the much larger disk radius, greatly challenges any numerical simulation of this flow. the purpose of the present work is to investigate the scope and limits of a thin film approximation combined with the von Kármán-Pohlhausen method to analyze the flow on the spinning disk. the results obtained with this integral method are compared against experimental results and numerical results from a CFD analysis using the Volume-of-Fluid method. Good agreement is observed for the instantaneous as well as the time-averaged numerical results. the integral method reproduces very well the experimentally observed reduced averaged height of a wavy film in comparison to the height of a smooth film. It is shown that the depth-averaged formulation is capable to capture the essential features of the thin film flow even in the wavy region. the deficits of the assumed velocity profiles do not markedly impair the description of the liquid flow, especially in the near wall region.

关键词： thin films

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Criterion for predicting direction of the crack in composites with random struture

Criterion for predicting direction of the crack in composite...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Podgórski, Jerzy Department of Structural Mechanics Faculty of Civil Engineering and Architecture Lublin University of Technology ul. Nadbystrzycka 40 20-618 Lublin Poland

ISBN: (纸本)9783950353709

Presented paper contains results of fracture analysis of brittle composite materials with a random distribution of grains. the composite structure has been modelled as an isotropic matrix that surrounds circular grains with random diameters and space position. Analyses were preformed for the rectangular "numerical sample" by finite element method. FE mesh for the examples were generated using the authors' computer program RandomGrain. Fracture analyses were accomplished with the authors' computer program CrackPath3 executing the "fine mesh window" technique. Calculations were preformed in 2D space assuming the plane stress state. Current efforts focus on brittle materials such as rocks or concrete.

关键词： Finite element method

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Wavenumber domain filtering of elastic wave propagation for damage localization in composite plates

Wavenumber domain filtering of elastic wave propagation for ...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Radzieński, M. Kudela, P. Ostachowicz, W. Department of Mechanics of Intelligent Structures Institute of Fluid-Flow Machinery Polish Academy of Sciences Fiszera 14 St Gdansk 80-952 Poland Faculty of Electrical and Control Engineering Gdansk University of Technology Gabriela Narutowicza 11/12 St. Gdansk 80-233 Poland Faculty of Navigation Gdynia Maritime University Aleja Jana Pawla II 3 St. Gdynia 81-345 Poland

ISBN: (纸本)9783950353709

the goal of this paper is to develop a method for enhancing damage visualization in structures based on elastic waves propagation phenomenon. Proposed method utilizes filtering and processing of full wavefield acquired by the laser vibrometer. the concept of wave filtering of propagating waves is tested on both numerical results and experimental data obtained from measurements of a glass/epoxy composite plates.

关键词： Guided electromagnetic wave propagation

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numerical investigations of 3D transitional and turbulent boundary layers with heat transfer

Numerical investigations of 3D transitional and turbulent bo...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Kielczewski, K. Tuliszka-Sznitko, E. Institute of Thermal Engineering Poznań University of Technology ul. Piotrowo 3 60-965 Poznań Poland

ISBN: (纸本)9783950353709

In the paper, we investigate using DNS/LES transitional and turbulent flow with heat transfer in the rotor/stator and rotor/rotor annular cavity of the aspect ratio from the range L=15 - 45, curvature parameter Rm = 1.8. For rotor/stator cavity computations have been performed for L=25-45;these results are complementary to the results published previously in Tuliszka-Sznitko et al. [11]. the influence of the impinging axial annular wall jet on the heated rotating disk boundary layer (rotor/rotor cavity) is also analysed. We present preliminary results which allow us to analyse the dynamics of the resulting large scale structures and their correlation with the local Nusselt number distributions.

关键词： Aspect ratio

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A comprehensive image processing methodology for automatically detecting shield tunnel defects

A comprehensive image processing methodology for automatical...

引用

6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Ai, Q. Yuan, Y. Department of Geotechnical Engineering Tongji University 1239 Siping Road Shanghai 200092 China

ISBN: (纸本)9783950353709

the condition of metro tunnels should be examined in advance for avoidance of high costs of repair and disruption. the inspection work is carried out by human naked eye, which is usually time-consuming and tedious, it may also lead to diagnostic errors due to lack of concentration. Recently, Image processing technology is widely used in the defects detecting of underground infrastructures, but there is little research aimed at detecting the surface defect in shield tunnel automatically. the condition of the shield tunnel is complex than other underground structures, a single or conventional image processing methodology is hardy efficient in the extraction of defects from acquired images. thus, a comprehensive image processing methodology was derived for detecting defects in shield tunnel. the proposed image processing methodology consists of four modules, which are: (1) image acquisition;(2) image pre-processing;(3) image segmentation;(4) feature extraction and classification. this paper presents a specialized image segmentation method for detecting defects in shield tunnel, which is image differencing based strategy. On the other hand, the conventional image processing methods are also applied in the shield tunnel images, results show the image differencing method is more robust and precise, and the proposed methodology is suitable for detecting defects in the shield tunnel.

关键词： Image segmentation

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On the analysis of FGM structures using enhanced finite elements

On the analysis of FGM structures using enhanced finite elem...

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6th european Congress on Computational methods in Applied Sciences and engineering, ECCOMAS 2012

作者： Kugler, St. Fotiu, P.A. Murin, J. Department of Applied and Numerical Mechanics University of Applied Sciences Wiener Neustadt Wiener Neustadt Austria Department of Applied Mechanics and Mechatronics Institute of Electroenergetics and Applied Electrotechnics Slovak University of Technology Bratislava Slovakia

ISBN: (纸本)9783950353709

Shell-like and beam structures made of Functionally Graded Materials (FGMs) show a gradual variation of material properties in one, two or three directions. In this paper an efficient low-order shell element with six nodal degrees of freedom (including the drill rotation) is presented, supplemented with a proper method for calculating effective elastic properties. this new FGM shell element is coupled with 3D FGM beam elements and combined elastostatic beam-shell structures are analyzed. the results indicate high a effectiveness and accuracy of the proposed approach.

关键词： Shells (structures)

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