Deep convolutional neural networks for estimating porous material parameters with ultrasound tomography

T Lähivaara, L Kärkkäinen, JMJ Huttunen… - The Journal of the …, 2018 - pubs.aip.org
The feasibility of data based machine learning applied to ultrasound tomography is studied
to estimate water-saturated porous material parameters. In this work, the data to train the …

Estimation of groundwater storage from seismic data using deep learning

T Lähivaara, A Malehmir, A Pasanen… - Geophysical …, 2019 - earthdoc.org
Convolutional neural networks can provide a potential framework to characterize
groundwater storage from seismic data. Estimation of key components, such as the amount …

A discontinuous Galerkin method for poroelastic wave propagation: The two-dimensional case

NFD Ward, T Lähivaara, S Eveson - Journal of Computational Physics, 2017 - Elsevier
In this paper, we consider a high-order discontinuous Galerkin (DG) method for modelling
wave propagation in coupled poroelastic–elastic media. The upwind numerical flux is …

Review of lattice Boltzmann method applied to computational aeroacoustics

S Weidong, LI Jun - Archives of Acoustics, 2019 - acoustics.ippt.gov.pl
This paper presents the research studies carried out on the application of lattice Boltzmann
method (LBM) to computational aeroacoustics (CAA). The Navier-Stokes equation-based …

Effects of fractures on the well production in a coalbed methane reservoir

T Jiang, J Zhang, H Wu - Arabian Journal of Geosciences, 2017 - Springer
A water-gas two-phase flow model of a fractured vertical well in a coalbed methane (CBM)
reservoir is developed based on the Buckley-Leverett equation. A program is developed …

Numerical dispersion analysis of discontinuous Galerkin method with different basis functions for acoustic and elastic wave equations

W Meng, LY Fu - Geophysics, 2018 - library.seg.org
The discontinuous Galerkin method (DGM) has been applied to investigate seismic wave
propagation recently. However, few studies have examined the dispersion property of DGM …

Analysis of a high-order space and time discontinuous Galerkin method for elastodynamic equations. Application to 3D wave propagation

S Delcourte, N Glinsky - ESAIM: Mathematical Modelling and …, 2015 - numdam.org
In this paper, we introduce a high-order discontinuous Galerkin method, based on centered
fluxes and a family of high-order leap-frog time schemes, for the solution of the 3D …

A non-uniform basis order for the discontinuous Galerkin method of the 3D dissipative wave equation with perfectly matched layer

T Lähivaara, T Huttunen - Journal of Computational Physics, 2010 - Elsevier
In this study a discontinuous Galerkin method (DG) for solving the three-dimensional time-
dependent dissipative wave equation is investigated. In the case of unbounded problems …

Estimating pipeline location using ground-penetrating radar data in the presence of model uncertainties

T Lähivaara, NFD Ward, T Huttunen, JP Kaipio… - Inverse …, 2014 - iopscience.iop.org
We study the inverse problem of estimating the pipeline location from ground-penetrating
radar data in the context of Bayesian inversion. Maxwellʼs equations are used to model the …

Introduction to applications of numerical analysis in time domain computational electromagnetism

Q Chen, P Monk - Frontiers in Numerical Analysis-Durham 2010, 2011 - Springer
We discuss two techniques for the solution of the time domain Maxwell system. The first is a
partial differential equation based approach using conforming finite elements and implicit …