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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51-60 订阅

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Acoustics simulation in the presence of moving interfaces in multiphase flows 6

Acoustics simulation in the presence of moving interfaces in...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Friedrich, Jonas Schäfer, Michael Institute of Numerical Methods in Mechanical Engineering Technische Universität Darmstadt Dolivostraße 15 Darmstadt64293 Germany

ISBN: (纸本)9788494731167

numerical simulations can help to understand the mechanisms of sound producing sources. In this work a numerical scheme for calculating surface tension dominated multiphase flows coupled with acoustics is presented. the Volume-of-Fluid (VOF) method is used to calculate the incompressible multiphase flow. Surface tension is taken into account by the Continuum Surface Force (CSF) method. An Expansion about Incompressible Flow (EIF) approach using the Linearized Euler Equations (LEE) is employed for the acoustics. the LEE are valid in each phase independently of the material parameters, but not at the interface. When the interface moves, unphysical acoustic sources arise. An approach which suppresses the sources in the interface region is applied. Comparing the new approach with the unchanged LEE in a moving drop test case, it is shown that the parasitic sound vanishes. An elliptic drop oscillating in a resting background flow serves as a second test case, in which the moving interface has to produce sound. A good agreement under 2.5 % between the frequencies of the oscillation and the acoustic pressure emitted by the drop is achieved. copyright © Crown copyright (2018).All right reserved.

关键词： Multiphase flow

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Solving Dynamic Soil Deformation-Fluid Flow Coupling Problems Using Material Point Method 1

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16th International conference of the International Association for Computer methods and Advances in Geomechanics, IACMAG 2021

作者： Soga, Kenichi Kularathna, Shyamini Department of Civil and Environmental Engineering University of California Berkeley United States

ISBN: (数字)9783030645144

ISBN: (纸本)9783030645137

In recent years, there has been an increasing amount of research on the Material Point Method (MPM) for modeling multi-phase coupled problems. Applying MPM in hydro-mechanical problems that interest geotechnical engineers have been explored in many of these studies. the explicit MPM method has been favored in dynamic large deformation problems due to its computational efficiency. However, numerically generated pore pressure oscillation has been a major issue. this paper presents a new formulation of MPM to model coupled soil deformation and pore fluid flow problems. the formulation is presented within the mixture theory framework, and pore water pressure is solved implicitly using a splitting algorithm based on the Chorins projection method. the splitting algorithm helps mitigate numerical instabilities at the incompressibility limit when equal-order interpolation functions are used. It reduces pressure oscillations and a time step size, which is independent of fluid compressibility and soil permeability. the proposed method is validated by comparing the numerical results with the closed form solutions of one dimensional and plane strain problems. © 2021, the Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Computational efficiency

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On numerical integrations of discontinuous Galerkin methods over high-order curved elements 6

On numerical integrations of discontinuous Galerkin methods ...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： You, Hojun Kim, Chongam Department of Mechanical and Aerospace Engineering Seoul National University Seoul08826 Korea Republic of

ISBN: (纸本)9788494731167

In this study, novel numerical approaches to handle the volume and surface integration terms of discontinuous Galerkin (DG) methods are proposed to significantly reduce computational costs especially on higher-order curved elements. One approach, called Direct Quadrature Method (DQM), generates a quadrature rule directly on the physical domain for a given set of points that are optimized to have well-conditioned Vandermonde matrix. the other one, called Direct Reconstruction Method (DRM), re-expresses the flux terms as Lagrange polynomials directly on the physical domain and integrates them in the pre-processing step. Since the proposed methods directly handle the integrations on the physical domain, they solely rely on the order of the solution approximation, not on the order of the elements. thus, they are particularly efficient on higher-order curved elements. In order to evaluate the proposed methods, two benchmark problems of the compressible Euler equations are computed on high-order curved quadrilateral meshes in two dimensions. Results verify that the proposed methods reduce the substantial amount of computational cost without compromising the required order-of-accuracy. copyright © Crown copyright (2018).All right reserved.

关键词： Computational fluid dynamics

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Indirect monitoring of railway bridges by direct integration 6

Indirect monitoring of railway bridges by direct integration

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Keenahan, Jennifer Obrien, Eugene J. Ren, Yifei UCD School of Civil Engineering University College Dublin Newstead Belfield Dublin 4 Ireland

ISBN: (纸本)9788494731167

Railway bridges are of importance as critical elements in transportation networks. Unfortunately, many railway bridges are old and these structures are subject to degradation over time. To monitor bridge structures, many methods are introduced. In recent years, indirect bridge monitoring methods have become more popular. these methods use passing vehicles to measure dynamic responses such as accelerations. In this paper, a new direct integration approach is introduced to directly calculate the apparent railway track profile (AP) that is consistent with the measured accelerations. An adaptation of the Newmark Beta numerical method is used for this purpose. Using AP, bridge displacement profile difference (BDPD) is calculated to monitor bridges. the BDPD is the difference between the baseline (healthy) profile and the apparent profile after damage and environmental effects. BDPD is sensitive to temperature change and bridge damage. It has its own frequency which is close to the bridge frequency. Copyright © Crown copyright (2018).All right reserved.

关键词： Railroads

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A sensitivity analysis of laser thermotherapy efficacy in lung cancer treatment to the temperature dependence of thermal properties

A sensitivity analysis of laser thermotherapy efficacy in lu...

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Annual International conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Pouya Namakshenas Leonardo Bianchi Paola Saccomandi Department of Mechanical Engineering Politecnico di Milano Milano Italy

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

Laser interstitial thermotherapy has shown potential in the treatment of inoperable lung cancers, which make up 70-80 % of all cases, thanks to the possibility of real-time ultrasound guidance, a fine introducer needle, and faster recovery after the procedure. To plan a laser ablation session through numerical modeling, the sensitivity analysis of the input parameters is necessary since simplifying the influential parameters could lead to a different treatment *** purpose of this study is to determine the sensitivity of laser-induced ablated volume, an indicator of therapy efficacy, with regard to the temperature dependence of thermal properties in the clinical power ranges (i.e., between 2 W and 5 W at the wavelength of 1064 nm) for lung tissue. According to the results, the difference between ablated volumes derived from constant and temperature-dependent thermal properties grows with increasing power, reaching 17.5% and 60.3% under ex vivo and in vivo conditions at 5 W, respectively. As the blood perfusion rate strongly affects the thermal effects in tissue, the temperature dependency of this parameter cannot be ignored. the assumption of constant thermal properties is valid for ex vivo planning by acceptable error when the laser power is set at a low level, e.g., ~ 2% at 2 W and ~ 6% at 3 *** Relevance—the methods and results of this study set the basis for defining the accurate pre-planning of laser-induced thermotherapy of lung cancer.

关键词： Temperature dependence Sensitivity analysis Lungs Power lasers Medical treatment Lung cancer thermal conductivity thermal analysis Planning Blood

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Efficiency of the fast multipole BEM with quadratic elements for 3D linear elasticity 6

Efficiency of the fast multipole BEM with quadratic elements...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Ptaszny, Jacek Swinka, Pawe L. Institute of Computational Mechanics and Engineering Silesian University of Technology Konarskiego 18A Gliwice44-100 Poland Faculty of Mechanical Engineering Silesian University of Technology Konarskiego 18A Gliwice44-100 Poland

ISBN: (纸本)9788494731167

A Fast Multipole Boundary Element Method (FMBEM) and a computer code for 3D elasticity is developed. Higher order boundary elements with quadratic shape functions, i.e. 8-node Serendipity elements, are applied to the discretization of geometry and boundary quantities. the numerical integration of boundary integrals, depending on Kelvin solutions, involves an adaptive subdivision of elements to provide a high accuracy of the calculations. the efficiency of the method is evaluated in terms of the model size, accuracy and execution time by a comparison with Finite Element Method (FEM) models, with quadratic shape function elements. Models of selected machine components, with stress concentration, are analysed. For the analysed structures, both methods provide results with similar accuracy. However, the FMBEM models have by an order of magnitude lower number of Degrees of Freedom (DOF) compared to the FEM, and can be analysed within time comparable to the FEM with a direct solver. thus, the FMBEM can be competetive to the widely used FEM. copyright © Crown copyright (2018).All right reserved.

关键词： Finite element method

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Vesicle shape deformation using a discontinuous Galerkin method 6

Vesicle shape deformation using a discontinuous Galerkin met...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Kim, Tae-Yeon Jiang, Wen Lee, Sung Mun Song, Jeong-Hoon Park, Eun-Jae Civil Infrastructure and Environmental Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates Fuels Modeling and Simulation Idaho National Laboratory Idaho FallsID83415 United States Department of Biomedical Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates Department of Civil Environmental and Architectural Engineering University of Colorado at Boulder BoulderCO80309 United States Department of Computational Science and Engineering Yonsei University Seoul03722 Korea Republic of

ISBN: (纸本)9788494731167

this work concerns the development of a finite-element algorithm to discretize the phase-field model for the shape deformation of a vesicle based on the idea of discontinuous Galerkin method. the phase-field model originated from minimization of Canham-Helfrich elastic bending energy involves fourth-order gradients and thus C1-basis functions are required for the standard conforming Galerkin formulation. We introduce a relatively inexpensive, nonconforming method based on C0-basis functions. We present the variational form of the method including additional terms to weakly enforce continuity of the derivatives across interelement boundaries and its stabilization is achieved via Nitsche's method. numerical tests for the equilibrium shape of a single component vesicle are performed to demonstrate the performance of the proposed variational formulation. copyright © Crown copyright (2018).All right reserved.

关键词： Galerkin methods

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numerical simulations of immiscible generalised Newtonian fluids 6

Numerical simulations of immiscible generalised Newtonian fl...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Sverdrup, Knut Nikiforakis, Nikos Almgren, Ann Centre for Scientific Computing University of Cambridge JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Center for Computational Sciences and Engineering Lawrence Berkeley National Laboratory 1 Cyclotron Rd BerkeleyCA94720 United States

ISBN: (纸本)9788494731167

We present a numerical methodology for three-dimensional large-scale simulations of two-fluid flow for generalised Newtonian fluids exhibiting non-Newtonian behaviour such as a non-zero yield stress and power-law dependency on strain-rate. the incompressible continuity and Cauchy momentum equations, along with appropriate rheological models, are solved using a computational framework initially developed at Lawrence Berkeley National Laboratory. the solver uses second-order Godunov methodology for the advective terms and semi-implicit diffusion in the context of an approximate projection method to evolve the system in time. We have extended the algorithm to enable the simulation of Herschel-Bulkley fluids by means of a mathematical regularisation of the constitutive equation which describes the fluid rheology. Additionally, interfaces between fluids with different properties are treated using a passively advected indicator function. the performance of the software is validated for two-dimensional displacement flow and tested on a three-dimensional viscoplastic dambreak. copyright © Crown copyright (2018).All right reserved.

关键词： Strain rate

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Calibration and numerical modeling of RC beam-column joints designed for gravity loads 8

Calibration and numerical modeling of RC beam-column joints ...

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8th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2021

作者： Sabene, Marcello Zucconi, Maria Pampanin, Stefano Ferracuti, Barbara Niccolò Cusano University Via Don Carlo Gnocchi 3 Rome00166 Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome Via Eudossiana 18 Rome00184 Italy

Damage reports after recent earthquakes prove that the structural deficiencies of non-ductile Reinforced Concrete (RC) buildings often lead to structural element local damage and collapse of the entire structure. the structural weakness of the Beam-Column joints, due to the absence of seismic detailing and capacity design principles, plays a key role in the seismic vulnerability of european building stock designed before the 1970's, thus before the introduction of modern seismic codes. In RC buildings subjected to reversed cyclic earthquake loads, high stress concentration occurs at the Beam-Column joints, making these regions prone to the occurrence of severe damage and brittle mechanisms. Yet, a common engineering practice consists in modeling the Beam-Column joints as rigid elements in concrete frames, neglecting the joint's deformability and, more importantly, their actual local mechanism. Consequently, the predicted stiffness and the collapse mechanisms of the structure can, unconservatively, change significantly from the actual one. Starting from the experimental results available in literature, this work aims at calibrating the key parameters that characterize the equivalent joint moment-rotation hysteresis behavior of existing substandard Beam-Column joints, by using a simple while reliable lumped plasticity modeling approach. the numerical model was developed in OpenSees and validated on many experimental results collected from the literature. the global joints response relationships under cyclic loads, defined as a function of the joint structural detailing and the axial load, satisfactorily reproduce the experimental findings in terms of first cracking point, yielding point, overall hysteretic behavior, pinching effect, and strength degradation. Moreover, the initial and post-yielding stiffness values of the joint's backbone curve were further improved when compared to those recently proposed by the NZSEE2017 Seismic Assessment Guidelines. © 2021 COMPDYN

关键词： numerical models

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Taylor least squares reconstruction technique for material point methods 6

Taylor least squares reconstruction technique for material p...

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6th ECCOMAS european conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS european conference on Computational Fluid Dynamics, ECFD 2018

作者： Wobbes, E.D. Möller, M. Galavi, V. Vuik, C. Department of Applied Mathematics Delft University of Technology Van Mourik Broekmanweg 6 Delft2628 XE Netherlands Geo-Engineering section Deltares Boussinesqweg 1 Delft2629 HV Netherlands

ISBN: (纸本)9788494731167

the material point method (MPM) is an effective computational tool for simulating problems involving large deformations. However, its direct mapping of the material-point data to the background grid frequently leads to severe inaccuracies. the standard function reconstruction techniques can considerably decrease these errors, but do not always guarantee the conservation of the total mass and linear momentum as the MPM algorithm does. In this paper, we introduce a novel technique, called Taylor Least Squares (TLS), which combines the Least Squares approximation with Taylor basis functions to reconstruct functions from scattered data. Within each element, the TLS technique approximates quantities of interest, such as stress and density, and when used with a suitable quadrature rule, it conserves the total mass and linear momentum after mapping the material-point information to the grid. the numerical and physical properties of the reconstruction technique are first illustrated on one- and two-dimensional functions. then the TLS technique is tested as part of MPM, Dual Domain Material Point Method (DDMPM), and B-spline MPM (BSMPM) on a one-dimensional problem experiencing small and large deformations. the obtained results show that applying the TLS approximation significantly improves the accuracy of the considered versions of the material point method, while preserving the physical properties of the standard MPM. Copyright © Crown copyright (2018).All right reserved.

关键词： Least squares approximations

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