Publications related to Effective models and numerical homogenization methods for long time wave propagation in heterogeneous media

A nodal discontinuous Galerkin finite element method for the poroelastic wave equation

We use the nodal discontinuous Galerkin method with a Lax-Friedrich flux to model the wave propagation in transversely isotropic and poroelastic media. The effect of dissipation due to global fluid flow causes a stiff relaxation term, which is incorporated ...

2018

Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge, Jérémy Genoud, Trach-Minh Tran, Konstantinos Avramidis

In order to study parasitic oscillation that may occur in a realistic beam duct upstream to the gyrotron cavity, the self-consistent linear and spectral code TWANGlinspec has been modified. The large inhomogeneities in the smooth-wall beam duct geometry or ...

2018

Scattering of SH-waves by an elliptic cavity/crack beneath the interface between functionally graded and homogeneous half-spaces via multipole expansion method

Alireza Ghafarollahi

In this study, based on multipole expansion method an analytical treatment is presented for the anti-plane scattering of SH-waves by an arbitrarily oriented elliptic cavity/crack which is embedded near the interface between exponentially graded and homogen ...

2018

Modeling tribocorrosion of passive metals - A review

Stefano Mischler, Shoufan Cao

Tribocorrosion is a material degradation phenomenon resulting from interactive effects between wear and corrosion. It is commonly found in engineering applications (e.g. biomedical implants and marine equipment) which involve relative motion of contacting ...

PERGAMON-ELSEVIER SCIENCE LTD2018

Hydrodynamics of a periodically wind‑forced small and narrow stratified basin: a large‑eddy simulation experiment

Alfred Johny Wüest, Damien Bouffard, Hugo Nicolás Ulloa Sánchez, Oscar Rodrigo Sepúlveda Steiner, Serban George Constantinescu, Kyoung Sik Chang

We report novel results of a numerical experiment designed for examining the basin-scale hydrodynamics that control the mass, momentum, and energy distribution in a daily wind-forced, small thermally-stratified basin. For this purpose, the 3-D Boussinesq e ...

2018

On stability of type II blow up for the critical NLW on $\mathbb{R}^{3+1}$

Joachim Krieger

We show that the finite time type II blow up solutions for the energy critical nonlinear wave equation [ \Box u = -u^5 ] on

\mathbb{R}^{3+1}

constructed in [28], [27] are stable along a co-dimension three manifold of radial data perturbations in a suit ...

2018

Optimization based methods for highly heterogeneous multiscale problems and multiscale methods for elastic waves

Multiscale or multiphysics partial differential equations are used to model a wide range of physical systems with various applications, e.g. from material and natural science to problems in biology or engineering. When the ratio between the smallest scale ...

EPFL2017

Multiscale methods for wave problems in heterogenous media

Assyr Abdulle, Patrick Henning

In this paper we give a survey on various multiscale methods for the numerical solution of second order hyperbolic equations in highly heterogenous media. We concentrate on the wave equation and distinguish between two classes of applications. First we dis ...

2017

Large-Scale Tsunami Simulations using the Discontinuous Galerkin Method

Jan Sickmann Hesthaven, Boris Bonev

Discontinuous Galerkin methods have desirable properties, which make them suitable for the com- putation of wave problems. Being parallelizable and hp-adaptive makes them attractive for the simulation of large-scale tsunami propagation. In order to retriev ...

2017

A mixture of thermoelastic solids with two temperatures

Maria Masid Barcon

In this work we study, from the numerical point of view, a problem involving one-dimensional thermoelastic mixtures with two different temperatures; that is, when each component of the mixture has its own temperature. The mechanical problem consists of two ...

Pergamon-Elsevier Science Ltd2017

Effective models and numerical homogenization methods for long time wave propagation in heterogeneous media

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A nodal discontinuous Galerkin finite element method for the poroelastic wave equation

Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts

Scattering of SH-waves by an elliptic cavity/crack beneath the interface between functionally graded and homogeneous half-spaces via multipole expansion method

Modeling tribocorrosion of passive metals - A review

Hydrodynamics of a periodically wind‑forced small and narrow stratified basin: a large‑eddy simulation experiment

On stability of type II blow up for the critical NLW on $\mathbb{R}^{3+1}$

Optimization based methods for highly heterogeneous multiscale problems and multiscale methods for elastic waves

Multiscale methods for wave problems in heterogenous media

Large-Scale Tsunami Simulations using the Discontinuous Galerkin Method

A mixture of thermoelastic solids with two temperatures

Hydrodynamics of a periodically wind‑forced small and narrow stratified basin: a large‑eddy simulation experiment

Multiscale methods for wave problems in heterogenous media

Large-Scale Tsunami Simulations using the Discontinuous Galerkin Method

A mixture of thermoelastic solids with two temperatures

On stability of type II blow up for the critical NLW on $\mathbb{R}^{3+1}$

A nodal discontinuous Galerkin finite element method for the poroelastic wave equation

Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts

Scattering of SH-waves by an elliptic cavity/crack beneath the interface between functionally graded and homogeneous half-spaces via multipole expansion method

Modeling tribocorrosion of passive metals - A review

Optimization based methods for highly heterogeneous multiscale problems and multiscale methods for elastic waves