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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451-460 订阅

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Adsorption modeling in a honeycomb adsorber with the use of SLD adsorption model and 3D boundary element flow solver

Adsorption modeling in a honeycomb adsorber with the use of ...

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

作者： Štimec, Teodor Hriberšek, Matjaž Ravnik, Jure Bašič, Sani Esotech D.d. Preloška c. 1 3320 Velenje Slovenia University of Maribor Faculty of Mechanical Engineering Smetanova ul. 17 2000 Maribor Slovenia

ISBN: (纸本)9783950353709

the paper presents numerical modeling of adsorption process in a honeycomb channel with adsorption layer on its walls. the analyzed system consists of air as a carrier fluid, water as adsorbate and TiO2 - WO3 - V2O5 thin adsorbent layer on the channel walls. Fluid flow with convective-diffusive mass transfer in the channel was simulated with 3D computational fluid dynamics software based on boundary element method. the adsorption equilibrium was calculated using SLD model. the developed numerical model enables predictions of adsorbate mass transfer dynamics, especially the concentration gradient propagation with the flow, and gives an insight into honeycomb system behavior dynamics.

关键词： Computational fluid dynamics

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A Generalized Isogeometrical Analysis approach for free vibration analysis of plane elasticity problems

A Generalized Isogeometrical Analysis approach for free vibr...

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

作者： Hassani, B. Abolbashari, M.H. Taheri, A.H. Moghaddam, N.Z. Department of Civil Engineering Shahrood University of Technology Po. Box *** Shahrood Iran Mechanical Engineering Department Ferdowsi University of Mashhad Po. Box 91775-1111 Mashhad Iran

ISBN: (纸本)9783950353709

this paper introduces a "Generalized Iso-Geometrical Analysis" (GIGA) approach for free vibration analysis of plane elasticity problems. the suggested approach which may be considered as the generalized form of the well-known isogeometric analysis method uses a unified modeling and analysis procedure which makes use of B-Splines and NURBS for definition of geometry, approxipation of solution and differential coefficients as well. the weak forms of the governing partial differential equations of dynamic analysis are developed by using a weighted residual approach under the plane elasticity conditions. Some numerical examples regarding various types of beams with different boundary conditions and aspect ratios are solved to investigate the efficiency of the method. Comparison of the obtained results with finite elements and some other available numerical methods as well as the available elasticity solutions, demonstrates the high performance and accuracy of the present method.

关键词： Aspect ratio

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numerical assessment of mass conservation on a MAC-type method for viscoelastic free surface flows

Numerical assessment of mass conservation on a MAC-type meth...

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

作者： Martins, Fernando P. Oishi, Cassio M. Sousa, Fabricio S. Cuminato, Jose A. Presidente Prudente Brazil São Carlos Brazil

ISBN: (纸本)9783950353709

A numerical study of mass conservation of MAC-type methods is presented, for viscoelastic free-surface flows. We use an implicit formulation which allows for greater time steps, and therefore time marching schemes for advecting the free surface marker particles have to be accurate in order to preserve the good mass conservation properties of this methodology. We then present an improvement by using a Runge-Kutta scheme coupled with a local linear extrapolation on the free surface. A thorough study of the viscoelastic impacting drop problem, for both Oldroyd-B and XPP fluid models, is presented, investigating the influence of timestep, grid spacing and other model parameters to the overall mass conservation of the method. Furthermore, an unsteady fountain flow is also simulated to illustrate the low mass conservation error obtained.

关键词： Finite difference method

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A systematic approach to design crash elements and to validate FE-analyses by combining computational methods with analytical considerations

A systematic approach to design crash elements and to valida...

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

作者： Müller, Bernhard Schagerl, Martin Schröder, Kai-Uwe Johannes Kepler University of Linz Institute of Constructional Lightweight Design Altenberger Strasse 69 4040 Linz Austria

ISBN: (纸本)9783950353709

A reliable validation of non-linear numerical analyses is vital for credible numerical testing procedures and thus to minimise cost-intensive test programs. In order to validate elasto-plastic numerical analyses of axially crushed thin-walled profiles with test results which might show cracking of the material, the comparison of force-displacement curves and the folding mode are essential. For this study a large number of crash tests and numerical analyses have been evaluated. the folding modes of these axially crushed thin-walled profiles made of high-strength steel have been assessed and categorised. the result is the visual assessment and categorisation scheme (VACS). the systematic comparison of numerical analyses and test results by means of the VACS enables a detailed validation procedure of axially crushed profiles by comparing the values of the introduced parameters defining the VACS. the application of the VACS on axially crushed profiles leads to indications for improving the cross-section design. the aim of improving the cross-section design is to reduce severe cracks and to prevent a mode change from local buckling and folding to global buckling in a bending mode.

关键词： thin walled structures

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An hp-adaptive level set method for simulating two-component flows in optofluidic devices

An hp-adaptive level set method for simulating two-component...

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

作者： Ronnås, Staffan Heuveline, Vincent Karlsruhe Institute of Technology Kaiserstraße 12 76131 Karlsruhe Germany

ISBN: (纸本)9783950353709

the development of optical elements based on liquid-liquid interfaces is a current research area in the field of optofluidics. Due to their reconfigurability and low production costs, such elements are highly beneficial in the effort to construct for instance Lab-on-a-Chip devices. With the aim of achieving a framework for accurate and efficient numerical simulation of these optical elements, the present work develops a model for immiscible and incompressible two-component fluid flow. the key challenge lies in the accurate representation of the interface between the two liquid components, which directly affects the accuracy of the evolution of the flow as well as of further numerical evaluation of the optical characteristics of the device. We use the level set method, and solve a least-squares variational formulation for the transport of the interface. To achieve high accuracy close to the interface, an hp-adaptive strategy for the successive approximation of the level set function is employed. the considered approach can be extended to other applications where a highly accurate resolution of the interface is required.

关键词： numerical methods

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Eulerian numerical methods on unstructured meshes for the simulation of sprays within liquid rocket engines

Eulerian numerical methods on unstructured meshes for the si...

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

作者： Le Touze, C. Murrone, A. Montreuil, E. Guillard, H. ONERA French Aerospace Lab. 29 av. de la Division Leclerc 92322 Chatillon France University of Nice Laboratoire J.A. Dieudonne Parc Valrose 06108 Nice Cedex 2 France INRIA Sophia-Antipolis BP 93 06902 Sophia Antipolis Cedex France

ISBN: (纸本)9783950353709

Under transient operating conditions, liquid-propellant rocket engines exhibit a twophase Liquid Oxygen (LOx) Hydrogen Gas (GH2) flow. As a result of primary atomization and fragmentation processes, the main LOx jet turns into a spray of small spherical droplets, which vaporizes to feed the combustion with GH2. the physical model for the spray consists of a system of conservative equations, derived from a kinetic equation for the droplets number density function. Source terms of mass, momentum and energy transfer allow for the coupling with the dense phase. this paper is devoted to the numerical methods developed in the finite volume CEDRE software for the eulerian numerical simulations of sprays. We herein especially focus on the approximation of the convective flux. For that purpose, an extension of the second-order multislope MUSCL technique to general unstructured meshes is introduced. this new method will be eventually used to achieve the numerical simulation of the ONERA's MASCOTTE test bench for cryogenic combustion research.

关键词： numerical methods

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the collocations and least squares method: Application to numerical solution of the Navier-Stokes equations

The collocations and least squares method: Application to nu...

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

作者： Shapeev, Vasily P. Isaev, Vadim I. Idimeshev, Semen V. Khristianovich Institute of Theoretical and Applied Mechanics Russian Academy of Sciences Institutskaya st. 4/1 Novosibirsk 630090 Russia

ISBN: (纸本)9783950353709

the collocations and least squares method is applied for numerical solution of the stationary Navier-Stokes equations in 2D and 3D cases. Convergence of the solution on a sequence of refining grids was investigated. It was shown in numerical experiments that high order of convergence (higher than 1) can be achieved in case of a smooth solution. the paper contains a description of several new variants of the method. First, the 2D case is considered. the approach for constructing variants with an arbitrary convergence order is proposed. As an example, the variants of the method up the 8th order are demonstrated. Second, the 3D case is considered. the variant of the second order is described. In addition, the method was tested on the benchmark problem of the lid-driven cavity flow in both 2D and 3D cases. Good agreement with highly-accurate results obtained by other researchers was shown.

关键词： Navier Stokes equations

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Finite strain fracture analysis using the eXtended Finite Element Method

Finite strain fracture analysis using the eXtended Finite El...

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

作者： Rashetnia, R. Mohammadi, S. Mahmoudzadeh Kani, I. School of Civil Engineering College of Engineering University of Tehran 16 Azar St. Enghelab Ave. Tehran Iran

ISBN: (纸本)9783950353709

Nonlinear fracture analysis of rubber-like materials is computationally challenging due to a number of complicated numerical problems. the aim of this paper is to study large strain fracture problems based on appropriate enrichment functions within the eXtended Finite Element Method (XFEM). this method enhances the conventional FEM capabilities and allows for independent representation of the entire crack from the mesh, based on the construction of the enriched finite element approximation. A more accurate approximation is obtained by including the basis terms of analytical solutions into the enrichment functions. For many rubber-like materials, very little volumetric deformation is observed even at large strain processes. As a result, material behavior is considered under homogeneous, isotropic, plane stress and incompressible conditios, which can be governed by the incompressible Neo-Hookean constitutive equation. It is demonstrated that the numerical results are in good agreement with available benchmarks.

关键词： Fracture mechanics

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An improved flexibility-based nonlinear frame element endowed with the fiber-free formulation

An improved flexibility-based nonlinear frame element endowe...

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

作者： Marmo, Francesco Rosati, Luciano Department of Structural Engineering University of Naples Federico II Italy via Claudio 21 80124 Napoli Italy

ISBN: (纸本)9783950353709

Within the framework of flexibility formulations we present a frame element which enhances the performances of previously formulated elements in a threefold manner. First, the analytical evaluation of the section integrals is carried out by means of the fiberfree approach, what avoids the use of the inaccurate fiber method;second, a variationally-based evaluation of the effects of element loads is derived in order to apply concentrated forces and moments without the need to split the element in several subdomains;third, it is illustrated the application of a spline interpolation for the evaluation of strains and displacements at every section of the element, thus overcoming a common drawback of flexibility based formulations. numerical tests and comparisons with experimental results show the challenging performances of the proposed formulation.

关键词： Fibers

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Simulation of microstructure, temperature, and stress inwave soldering

Simulation of microstructure, temperature, and stress inwave...

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

作者： Mizui, Takahiro Takaki, Tomohiro Mechanical and System Engineering Kyoto Institute of Technology Matsugasaki Sakyo Kyoto 606-85858 Japan

ISBN: (纸本)9783950353709

the replacement of lead-containing solder alloy with lead-free alloys has brought to the fore some new reliability issues. therefore, it is important to elucidate the mechanisms that cause the aforementioned issues. In this study, we focused on lift-off, a typical defect when using lead-free solder, and developed a numerical model to clarify the mechanism of the lift-off that occurs during wave soldering. the constructed model can simulate the temperature and stress fields in the macro domain and the solidification microstructure in the micro domain, during soldering. Soldering simulations carried out using the developed model highlighted regions of high stress concentration around the fillet edge, where brittle Bi is segregated.

关键词： Finite element method

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