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

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Large eddy simulation of a muffler with the high-order spectral difference method 9

Large eddy simulation of a muffler with the high-order spect...

引用

9th International conference on Spectral and High Order methods, ICOSAHOM 2012

作者： Parsani, Matteo Bilka, Michael Lacor, Chris Computational Aerosciences Branch NASA Langley Research Center HamptonVA23681 United States Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia University of Notre Dame Department of Aerospace and Mechanical Engineering 365 Fitzpatrick Hall Notre DameIN46556-5637 United States Department of Mechanical Engineering Vrije Universiteit Brussel Pleinlaan 2 Brussels1050 Belgium

ISBN: (纸本)9783319016009

the combination of the high-order accurate spectral difference discretization on unstructured grids with subgrid-scale modelling is investigated for large eddy simulation of a muffler at Re = 4:64 104 and M = 0:05. the subgridscale stress tensor is modelled by the wall-adapting local eddy-viscosity model with a cut-off length which is a decreasing function of the order of accuracy of the scheme. numerical results indicate that even when a fourth-order accurate scheme is used, the coupling with a subgrid-scale model improves the quality of the results. © Springer International Publishing Switzerland 2014.

关键词： Large eddy simulation

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Hybridization of the FDTD Method with Use of the Discrete Green's Function

Hybridization of the FDTD Method with Use of the Discrete Gr...

引用

european conference on Antennas and Propagation

作者： Tomasz P. Stefanski Faculty of Electronics Telecommunications and Informatics Department of Microwave and Antenna Engineering Gdansk University of Technology

ISBN: (纸本)9781479924318

In this contribution, a hybrid technique is presented which combines the finite-difference time-domain (FDTD) method and the discrete Green's function (DGF) formulation of this method. FDTD is a powerful technique for the analysis of complex penetrable objects but its application is not efficient when the computational domain includes many free-space cells. therefore, the hybrid method was developed which is applicable to complex geometries comprising a wire antenna mutually coupled with an inhomogeneous dielectric scatterer. In the developed method, the antenna and the scatterer are separated using the surface equivalence theorem. then, the dielectric domain is simulated using the FDTD method whilst the wire antenna is simulated using the DGF formulation of FDTD. Obtained results demonstrate that both methods can be perfectly coupled without introducing any additional errors to the FDTD solution (assuming infinite numerical precision of computations).

关键词： Computational electromagnetics FDTD methods Green's function methods

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Biocompatibility of Implantable Antennas: Design and Performance Considerations

Biocompatibility of Implantable Antennas: Design and Perform...

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european conference on Antennas and Propagation

作者： Konstantinos A. Psathas Asimina Kiourti Konstantina S. Nikita School of Electrical & Computer Engineering National Technical University of Athens Greece

Biocompatibility is one of the most important aspects that need to be taken into account when it comes to implantable antennas. However, very few studies have addressed the effects that biocompatibility considerations might have on the design and performance of implantable antennas. this study addresses the conversion of non-biocompatible implantable antennas into their biocompatible equivalents, exploring the difficulties and proposing solutions. Two methods are suggested for ensuring the biocompatibility of implantable antennas, and these are further investigated and compared. the proposed biocompatible antennas are finally evaluated within an anatomical head model for intra-cranial pressure (ICP) monitoring applications.

关键词： Antennas Biological system modeling Microwave integrated circuits Substrates numerical models

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Fullwave Computation of Path Loss in Urban Areas

Fullwave Computation of Path Loss in Urban Areas

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european conference on Antennas and Propagation

作者： Conor Brennan Dung Trinh School of Electronic Engineering Dublin City University

ISBN: (纸本)9781479924318

A full-wave method based on an integral equation formulation is proposed for computing path loss in urban areas. Unaccelerated full-wave methods potentially have massive associated computational burdens. In order to reduce the computational complexity, a Hybrid Forward Backward Method (HFBM) is applied (the conventional Forward Backward Method diverges in this scenario). the numerical analysis demonstrates that the path-loss generated by a forward-scattering HFBM matches those generated by a numerically precise solution. In addition the simulation results show that the path-loss generated by the forward-scattering HFBM show better agreement with the measurement data than those generated by the slope diffraction method (SDP) which is another vertical plane model used as the reference method in this paper.

关键词： Iterative method Propagation Method of Moment (MoM) Integral Equation (IE) Hybrid Forward Backward Method (HFBM) Urban Areas

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numerical investigation of aerodynamic forces on two stationary rectangular prisms in tandem arrangement 6

Numerical investigation of aerodynamic forces on two station...

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6th european and African conference on Wind engineering, EACWE 2013

作者： Zheng, Shixiong Tang, Yu Research Centre for Wind Engineering Southwest Jiaotong University Chengdu610031 China

the numerical method and the code for solution of 2D incompressible unsteady Reynolds-averaged Navier-Stokes(URANS) equations with SST κ-ω turbulent model are firstly validated for the flow past a single and two tandem square prisms. then, two rectangular prisms arranged in tandem with different spacing are investigated intensively. Results show that the flow around two tandem rectangular prisms is similar to that around two square prisms, and the aerodynamic forces also take on the similar tendency.

关键词： numerical methods

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Flutter stability studies of Great Belt East suspension Bridge by two CFD numerical simulation methods 6

Flutter stability studies of Great Belt East suspension Brid...

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6th european and African conference on Wind engineering, EACWE 2013

作者： Zhan, Hao Fang, Tao Zhang, Zhiguo China Railway Major Bridge Reconnaissance and Design Institute Co. Ltd. China Huazhong University of Science and Technology China University of Shanghai for Science and Technology China

In the paper, two methods are introduced to calculate flutter critical wind speed (Vcrit) of Great Belt East Bridge. For the first method, by secondary development of software FLUENT, establishes two-dimensional bending and torsional fluid-structure interaction numerical model to calculate *** to time histories of vertical displacements and torsional displacements, we can judge Vcrit. For the second method, calculate flutter derivatives by forced-motion approach. then by Scanlan's two-dimensional critical wind speed calculate theory, we can get *** results of two methods are roughly in agreement with wind tunnel *** first method we know interaction between the main beam and vortex motion is one of reasons leading to divergent vibration. By second method we can further understand coupled flutter mechanism according to flutter derivatives versus wind speed.

关键词： Fluid structure interaction

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the simulation of non-synoptic effects with applications to wind loading using CFD 6

The simulation of non-synoptic effects with applications to ...

引用

6th european and African conference on Wind engineering, EACWE 2013

作者： Haines, Matthew Singh, Nishant Sterling, Mark Taylor, Ian School of Civil Engineering University of Birmingham BirminghamB15 2TT United Kingdom Department of Mechanical Engineering University of Strathclyde GlasgowG1 1XJ United Kingdom

this paper will examine two numerical approaches to simulating the University of Birmingham non-synoptic winds simulator. Both simulations have used URANS and either DES or LES to simulate the simulator. the first case considers a simple domain that for the DES case uses an inlet condition which bases its turbulence generation on the value of turbulent kinetic energy found in the real world simulator. the second case uses a slightly different domain with a novel mixed synthetic boundary condition being used at the inlet. the similarities, differences, advantages and disadvantages of the two methods will be discussed.

关键词： Simulators

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Influence of Anisotropic Yield Functions on Parameters of Yoshida-Uemori Model

Influence of Anisotropic Yield Functions on Parameters of Yo...

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16th ESAFORM conference on Material Forming (ESAFORM 2013)

作者： Kano, Hirotaka Hiramoto, Jiro Inazumi, Toru Uemori, Takeshi Yoshida, Fusahito JFE Steel Corp Steel Res Lab Chiba Japan

ISBN: (纸本)9783037857199

the Yoshida-Uemori model (Y-U model) can be used with any types of yield functions. the calculated stress strain response will be, however, different depending on the function chosen and on the effective plastic strain definition. thus several modifications to the Y-U model were proposed in the 10th International conference on Technology of Plasticity [1]. It was ascertained that in the modified Y-U model, the same set of material parameters can be used with von Mises, Hill's 1948, and Hill's 1990 yield function. In this study, Yld2000-2d and Yoshida's 6th-order polynomial type 3D yield function were examined and it was clarified that the same set of Y-U parameters can be used with these yield functions.

关键词： numerical methods Anisotropic yield function Parameters

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General report of TC 212 deep foundations 18

General report of TC 212 deep foundations

引用

18th International conference on Soil Mechanics and geotechnical engineering, ICSMGE 2013

作者： Katzenbach, R. Choudhury, D. Chang, D.W. Institute and Laboratory for Geotechnics Department of Civil Engineering and Geodesy Technical University Darmstadt Darmstadt Germany Department of Civil Engineering Indian Institute of Technology Bombay Mumbai India Department of Civil Engineering Tamkang University New Taipei City Taiwan

this general report is prepared from the selected 62 papers of 18 ICSMGE which are related to the domain of studies for ISSMGE Technical Committee TC 212 - Deep Foundations. Paper IDs 1691-3105, which are presented during two sessions of TC 212 - Deep Foundations are from 26 member societies, which include Algeria (1), Argentina (1), Australia (6), Brazil (7), Bulgaria (1), Canada (3), China (2), Finland (2), Denmark (1), Egypt (3), France (4), Germany (1), Hungary (2), India (2), Iran (1), Italy (1), Japan (4), Korea (3), Mexico (1), Netherland (1), Poland (2), Russia (2), thailand (1), UK (5), USA (4) and Vietnam (1). Value in parenthesis indicates number of papers from that particular member society. the subjects of these papers cover a variety of sub-themes like (i) foundation behaviour and performance (15), (ii) technologies for construction, rehabilitation and energy (6), (iii) analytical and numerical analyses on piles and pile-raft foundation (20), (iv) field measurements (5), (v) seismic hazard analysis (2), (vi) design methods and assessments (2), (vii) model testing, soil behaviours on soil-pile interactions (8), (viii) predictions from testing methods (4).

关键词： Piles

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On the rate of convergence of the Hamiltonian particle-mesh method

引用

6th International Workshop on Meshfree methods for Partial Differential Equations

作者： Peeters, Bob Oliver, Marcel Bokhove, Onno Molchanov, Vladimir Department of Applied Mathematics University of Twente Enschede Netherlands School of Engineering and Science Jacobs University 28759 Bremen Germany

ISBN: (纸本)9783642329784

the Hamiltonian Particle-Mesh (HPM) method is a particle-in-cell method for compressible fluid flow with Hamiltonian structure. We present a numerical short-time study of the rate of convergence of HPM in terms of its three main governing parameters. We find that the rate of convergence is much better than the best available theoretical estimates. Our results indicate that HPM performs best when the number of particles is on the order of the number of grid cells, the HPM global smoothing kernel has fast decay in Fourier space, and the HPM local interpolation kernel is a cubic spline. © 2013 Springer-Verlag.

关键词： Hamiltonians

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