Wave Propagation and Elasticity in Granular Soils: A Numerical Approach for a Micromechanical Perspective

In this research, the discrete element method has been used to analyze wave propagation and to investigate the factors affecting wave reduction in granular soils. The method of discrete elements is important because of the possibility of preparing completely similar specimens and examining the effect of changes in a certain parameter on the Behavior of the specimens. This method also provides an understanding of the changes that have occurred at the micro-scale of granular materials that are not achievable with other laboratory and numerical methods. To model the specimens, a set of disks with specific granulation has been used for two-dimensional studies. PFC 2D software has been used to perform simulations and related analyzes such as interparticle force. The DEM code in MATLAB is used to check the wave depreciation. In this research, the optimization process was performed using experimental data and the Taguchi method using the DEM method. The results of this study show that there is a direct relationship between the number of particle set contacts and the wave propagation speed. Also, material properties such as particle density are the most important parameters affecting wave velocity. The results of the method (DEM) are done with PFC 2D software and a comparison between the results of this method with the solution methods used by other researchers is shown to be a good match.

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Analysis of Guided Wave Propagation in a Multi-Layered Structure in View of Structural Health Monitoring

Applied Sciences ◽

10.3390/app9214600 ◽

2019 ◽

Vol 9 (21) ◽

pp. 4600 ◽

Cited By ~ 4

Author(s):

Yevgeniya Lugovtsova ◽

Jannis Bulling ◽

Christian Boller ◽

Jens Prager

Keyword(s):

Wave Propagation ◽

Structural Health Monitoring ◽

Health Monitoring ◽

Guided Waves ◽

Oil And Gas ◽

Numerical Approach ◽

Guided Wave ◽

Mode Shapes ◽

Engineering Structures ◽

Structural Health

Guided waves (GW) are of great interest for non-destructive testing (NDT) and structural health monitoring (SHM) of engineering structures such as for oil and gas pipelines, rails, aircraft components, adhesive bonds and possibly much more. Development of a technique based on GWs requires careful understanding obtained through modelling and analysis of wave propagation and mode-damage interaction due to the dispersion and multimodal character of GWs. The Scaled Boundary Finite Element Method (SBFEM) is a suitable numerical approach for this purpose allowing calculation of dispersion curves, mode shapes and GW propagation analysis. In this article, the SBFEM is used to analyse wave propagation in a plate consisting of an isotropic aluminium layer bonded as a hybrid to an anisotropic carbon fibre reinforced plastics layer. This hybrid composite corresponds to one of those considered in a Type III composite pressure vessel used for storing gases, e.g., hydrogen in automotive and aerospace applications. The results show that most of the wave energy can be concentrated in a certain layer depending on the mode used, and by that damage present in this layer can be detected. The results obtained help to understand the wave propagation in multi-layered structures and are important for further development of NDT and SHM for engineering structures consisting of multiple layers.

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LARGE SCALE SIMULATION OF WAVE PROPAGATION IN SOILS INTERACTING WITH STRUCTURES USING FEM AND SBFEM

Journal of Computational Acoustics ◽

10.1142/s0218396x11004316 ◽

2011 ◽

Vol 19 (01) ◽

pp. 75-93 ◽

Cited By ~ 10

Author(s):

MARCO SCHAUER ◽

SABINE LANGER ◽

JOSE E. ROMAN ◽

ENRIQUE S. QUINTANA-ORTÍ

Keyword(s):

Wave Propagation ◽

Soil Structure ◽

Large Scale ◽

Dynamical Behavior ◽

Radiation Condition ◽

Numerical Approach ◽

Soil Structure Interaction ◽

Crucial Point ◽

Large Scale Problems ◽

Energy Plants

This paper applies a parallel algorithm for a coupled Finite Element/Scaled Boundary Element (FEM/SBFEM)-approach to study soil-structure-interaction problems. The application code is designed to run on clusters of computers, and it enables the analysis of large-scale problems. A crucial point of the approach is that the SBFEM fulfills the radiation condition. Hence, the hybrid numerical approach is well suited for such problems where wave propagation to infinity in an unbounded domain must be considered. The main focus of the paper is to show the applicability of the numerical implementation on large scale problems. First the coupled FEM/SBFEM approach is validated by comparing the numerical results with a semi-analytical solution for a settlement problem. Then the implemented algorithm is applied to study the dynamical behavior of founded wind energy plants under time dependent loading.

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A high-order numerical approach with Cartesian meshes for modeling of wave propagation and heat transfer on irregular domains with inhomogeneous materials

Computer Methods in Applied Mechanics and Engineering ◽

10.1016/j.cma.2020.113249 ◽

2020 ◽

Vol 370 ◽

pp. 113249

Author(s):

A. Idesman ◽

B. Dey

Keyword(s):

Heat Transfer ◽

Wave Propagation ◽

Numerical Approach ◽

High Order ◽

Inhomogeneous Materials ◽

Irregular Domains ◽

Cartesian Meshes

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Analysis of wave propagation in dry granular soils using DEM simulations

Acta Geotechnica ◽

10.1007/s11440-011-0142-7 ◽

2011 ◽

Vol 6 (3) ◽

pp. 167-182 ◽

Cited By ~ 16

Author(s):

Natasha Zamani ◽

Usama El Shamy

Keyword(s):

Wave Propagation ◽

Granular Soils ◽

Dem Simulations

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Simplified effective stress simulation of shear wave propagation in saturated granular soils

Géotechnique Letters ◽

10.1680/jgele.19.00023 ◽

2021 ◽

Vol 11 (1) ◽

pp. 1-22

Author(s):

K. Zhao ◽

Q. Wang ◽

Q. Chen ◽

H. Zhuang ◽

G. Chen

Keyword(s):

Wave Propagation ◽

Shear Wave ◽

Effective Stress ◽

Granular Soils ◽

Stress Simulation

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Wave propagation in dissipative or dispersive nonlinear media: a numerical approach

Applied Mathematics and Computation ◽

10.1016/0096-3003(80)90019-3 ◽

1980 ◽

Vol 6 (4) ◽

pp. 309-334 ◽

Cited By ~ 3

Author(s):

M.N. Oğuztöreli ◽

E.S. Şuhubi ◽

K.V. Leung

Keyword(s):

Wave Propagation ◽

Numerical Approach ◽

Nonlinear Media

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Finite‐difference modeling of viscoelastic and anisotropic wave propagation using the rotated staggered grid

Geophysics ◽

10.1190/1.1707078 ◽

2004 ◽

Vol 69 (2) ◽

pp. 583-591 ◽

Cited By ~ 166

Author(s):

Erik H. Saenger ◽

Thomas Bohlen

Keyword(s):

Wave Propagation ◽

Finite Difference ◽

Wave Equations ◽

Physical Property ◽

Anisotropic Media ◽

Numerical Approach ◽

Elementary Cell ◽

Staggered Grid ◽

Difference Operators ◽

Von Neumann

We describe the application of the rotated staggered‐grid (RSG) finite‐difference technique to the wave equations for anisotropic and viscoelastic media. The RSG uses rotated finite‐difference operators, leading to a distribution of modeling parameters in an elementary cell where all components of one physical property are located only at one single position. This can be advantageous for modeling wave propagation in anisotropic media or complex media, including high‐contrast discontinuities, because no averaging of elastic moduli is needed. The RSG can be applied both to displacement‐stress and to velocity‐stress finite‐difference (FD) schemes, whereby the latter are commonly used to model viscoelastic wave propagation. With a von Neumann‐style anlysis, we estimate the dispersion error of the RSG scheme in general anisotropic media. In three different simulation examples, all based on previously published problems, we demonstrate the application and the accuracy of the proposed numerical approach.

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PREDICTION OF ACOUSTIC WAVE PROPAGATION IN A SHALLOW WATER CONFIGURATION USING THE METHOD OF FUNDAMENTAL SOLUTIONS

Journal of Computational Acoustics ◽

10.1142/s0218396x12500130 ◽

2012 ◽

Vol 20 (04) ◽

pp. 1250013 ◽

Cited By ~ 8

Author(s):

E. G. A. COSTA ◽

L. GODINHO ◽

A. PEREIRA ◽

J. A. F. SANTIAGO

Keyword(s):

Wave Propagation ◽

Acoustic Wave ◽

Shallow Water ◽

Free Water ◽

Numerical Approach ◽

Fundamental Solutions ◽

Method Of Fundamental Solutions ◽

Acoustic Wave Propagation ◽

Water Region ◽

Shallow Water Region

An efficient and accurate numerical frequency domain formulation is proposed to investigate the 2D acoustic wave propagation within a shallow water region with a rigid bottom and a free surface. The proposed configuration combines different regions that have either a sloping or a flat rigid bottom. The numerical approach used here is based on the method of fundamental solutions (MFS). In this model only the vertical interface between different regions is discretized, as the model incorporates Green's functions that take into account the free water surface and the presence of either a horizontal or sloping rigid bottom.

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