A5083181565- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Computational Fluid Dynamics and Aerodynamics
- Gas Dynamics and Kinetic Theory
- Advanced Numerical Methods in Computational Mathematics
- Fluid Dynamics and Turbulent Flows
- Geotechnical Engineering and Underground Structures
- Numerical methods in engineering
- Electromagnetic Simulation and Numerical Methods
- Advanced Mathematical Modeling in Engineering
- Drilling and Well Engineering
- Fluid Dynamics and Vibration Analysis
- Structural Health Monitoring Techniques
- earthquake and tectonic studies
- Seismic Performance and Analysis
- Navier-Stokes equation solutions
- Landslides and related hazards
- Geotechnical Engineering and Soil Mechanics
- Fluid Dynamics Simulations and Interactions
- Seismology and Earthquake Studies
- Ultrasonics and Acoustic Wave Propagation
- Plasma and Flow Control in Aerodynamics
- Mathematics, Computing, and Information Processing
- Aquatic and Environmental Studies
- CO2 Sequestration and Geologic Interactions
Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement
2014-2024
Géoazur
2017-2021
Laboratoire de Mécanique des Sols, Structures et Matériaux
2021
Institut national de recherche en informatique et en automatique
1991-2018
Numerical Method (China)
2006-2017
Lawrence Berkeley National Laboratory
2016
Institute of Seismology
2015
Centre de Recherche en Informatique
1989-2014
Institut Français
2014
Gouvernance, Risque, Environnement, Développement
2009-2013
We present a discontinuous Galerkin finite-element method (DG-FEM) formulation with Convolutional Perfectly Matched Layer (CPML) absorbing boundary condition for 3-D elastic seismic wave modelling. This makes use of unstructured tetrahedral meshes locally refined according to the medium properties (h-adaptivity), and approximation orders that can change from one element another an adequate criterion (p-adaptivity). These two features allow us significantly reduce computational cost...
PREdiction of NOn-LINear soil behavior (PRENOLIN) is an international benchmark aiming to test multiple numerical simulation codes that are capable predicting nonlinear seismic site response with various constitutive models.One the objectives this project assessment uncertainties associated 1D effects.A first verification phase (i.e., comparison between on simple idealistic cases) will be followed by a validation phase, comparing predictions such estimations actual strongmotion recordings...
This article presents the main results of validation phase PRENOLIN project.PRENOLIN is an international benchmark on 1D nonlinear (NL) site-response analysis.This project involved 19 teams with 23 different codes tested.It was divided into two phases; first verifying numerical solution these idealized soil profiles using simple signals and real seismic records.The second described in this referred to code for analysis instrumented sites.This performed sites (KSRH10 Sendai) Japanese...
We present an extension of the nodal discontinuous Galerkin method for elastic wave propagation to high interpolation orders and arbitrary heterogeneous media. The high-order lagrangian is based on a set nodes with excellent properties in standard triangular element. In order take into account highly variable geological media, another suitable quadrature points used where physical mechanical medium are defined. implement methodology 2-D solver. First, convergence study confirms...
Modelling dynamic rupture for complex geometrical fault structures is performed through a finite volume method. After transformations building up the partial differential system following explicit conservative law, we design an unstructured bi-dimensional time-domain numerical formulation of crack problem. As result, arbitrary non-planar faults can be explicitly represented without extra computational cost. On these surfaces, boundary conditions are set on stress fluxes and not values....
We are interested in the simulation of P-SV seismic wave propagation by a high-order Discontinuous Galerkin method based on centered fluxes at interfaces combined with leap-frog time-integration. This non-diffusive method, previously developed for Maxwell equations [4, 9, 20], is particularly well adapted to complex topographies and fault discontinuities medium. prove that scheme stable under CFL type condition discrete energy preserved an infinite domain. Convergence properties efficiency...
Dynamic rupture of a 3-D spontaneous crack arbitrary shape is investigated using finite volume (FV) approach. The full domain decomposed in tetrahedra whereas the surface, on which takes place, discretized with triangles that are faces tetrahedra. First all, elastodynamic equations described into pseudo-conservative form for an easy application FV discretization. Explicit boundary conditions given criteria based conservation discrete energy through surface. Using stress-threshold criterion,...
In this paper, we introduce a high-order discontinuous Galerkin method, based on centered fluxes and family of leap-frog time schemes, for the solution 3D elastodynamic equations written in velocity-stress formulation. We prove that explicit scheme is stable under CFL type condition obtained from discrete energy which preserved domains with free surface or decreasing absorbing boundary conditions. Moreover, study convergence method both semi-discrete fully illustrate results by propagation...
We present a discontinuous Galerkin method for site effects assessment. The P–SV seismic wave propagation is studied in 2-D space heterogeneous media. first-order velocity–stress system obtained by assuming that the medium linear, isotropic and viscoelastic, thus considering intrinsic attenuation. associated stress–strain relation time domain being convolution, which numerically intractable, we consider rheology of generalized Maxwell body replacing convolution set differential equations....
SUMMARY The numerical simulation of seismic wave propagation in realistic heterogeneous media, as sedimentary basins, is a key element hazard estimation. Many methods two dimensions are based on unstructured triangular meshes and explicit time schemes. However, the presence thin layers tangential stratigraphic contacts basins entails poorly shaped mesh elements: some triangle heights extremely small compared to edge lengths, which requires steps simulations thus leads prohibitive computation...
We propose a nodal high-order discontinuous Galerkin (DG) method for coupled wave propagation in heterogeneous elastoplastic soil columns. solve the elastodynamic system written velocity-strain formulation considering simultaneously three components of motion. A 3D Iwan model dry soils under dynamic loading is introduced DG (DG-3C) based on centered fluxes and low storage Runge–Kutta time scheme. Unlike linear case, nonlinear material behavior results coupling effects between different focus...
For seismic wave propagation, we propose a complete reanalysis of the finite-volume approach based on unstructured triangular meshes. Triangular control volumes are particularly well adapted to propagation elastic waves in heterogeneous media. We consider non-staggered pseudo-conservative formulation as time variation is controlled by fluxes edges element and implement 2D geometry both source excitation absorbing boundary conditions PML zones. Simple illustrations show that this method could...
Understanding the physics of rupture process requires very sophisticated tools where geometry ruptured surface has to be taken into account as well realistic friction laws on this surface. New formulations have been recently proposed for modelling dynamic shear crack using various methods. We propose a complete new reformulation based finite volume approach and we apply it canonical configurarions in order assess accuracy method propose.