Results 111 to 120 of about 27,402 (200)

Monitoring of water volume in a porous reservoir using seismic data: Validation of a numerical model with a field experiment

Near Surface Geophysics, Volume 24, Issue 2, Page 110-127, April 2026.
Abstract As global groundwater levels continue to decline rapidly, there is a growing need for advanced techniques to monitor and manage aquifers effectively. This study focuses on validating a numerical model using seismic data from a small‐scale experimental setup designed to estimate water volume in a porous reservoir.
Mahnaz Khalili, Bojan Brodic, Peter Göransson, Suvi Heinonen, Jan S. Hesthaven, Antti Pasanen, Marko Vauhkonen, Rahul Yadav, Timo Lähivaara   +8 more
wiley   +1 more source

Evolve Filter Stabilization Reduced-Order Model for Stochastic Burgers Equation

Fluids, 2018
In this paper, we introduce the evolve-then-filter (EF) regularization method for reduced order modeling of convection-dominated stochastic systems. The standard Galerkin projection reduced order model (G-ROM) yield numerical oscillations in a convection-
Xuping Xie, Feng Bao, Clayton G. Webster   +2 more
doaj   +1 more source

On Nonlinear Oscillations: Basins of Attraction, Harmonic Balance Solution Artifacts and Urabe's Existence Criterion for the Duffing Oscillator

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, Volume 106, Issue 4, April 2026.
ABSTRACT The Duffing oscillator is often considered as “the” prototype of a nonlinear oscillator as it exhibits many characteristic phenomena of nonlinear dynamics. One of these phenomena is the occurrence of multiple periodic solutions as considered here for the case of the harmonically excited slightly damped Duffing oscillator.
Hannes Dänschel, Lukas Lentz, Nils Gräbner, Utz von Wagner   +3 more
wiley   +1 more source

Fault Friction, Plate Rheology, and Mantle Torques From a Global Dynamic Model of Neotectonics

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract Improvements in software, parallel computing, global data sets, and laboratory flow‐laws help to develop the global Earth5 thin‐shell finite‐element model of Bird et al. (2008, https://doi.org/10.1029/2007jb005460) into a benchmark study. All experiments confirm that modeled faults (other than megathrusts) have low effective friction of 0.085 ±
Peter Bird, Jon Bryan May, Michele M. C. Carafa   +2 more
wiley   +1 more source

Studying the issue of acoustic wave scattering from a system of soft screens by the method of integral equations

Известия высших учебных заведений. Поволжский регион: Физико-математические науки
Background. The aim of the work is a theoretical and numerical study of the scalar problem of diffraction on the system of acoustically soft screens. Material and methods: a rigorous mathematical formulation of the diffraction problem is considered; the ...
V.O. Nesterov, A.A. Tsupak
doaj   +1 more source

POD-Galerkin Model for Incompressible Single-Phase Flow in Porous Media

Open Physics, 2016
Fast prediction modeling via proper orthogonal decomposition method combined with Galerkin projection is applied to incompressible single-phase fluid flow in porous media.
Wang Yi, Yu Bo, Sun Shuyu
doaj   +1 more source

An algorithm to create conservative Galerkin projection between meshes

, 2021
We present in this paper an algorithm to solve pure-convection problems with a conservative Lagrange-Galerkin formulation in the framework of the finite element method. The integrals obtained from the Lagrange-Galerkin formulation will be computed with an algorithm which leads to conservation of mass up to machine accuracy, when we ...
Gómez Molina, P., Sanz Lorenzo, L., Carpio, J.   +2 more
openaire   +1 more source

Algorithm for Numerical Solution of Diffraction Problem on the Joint of Two Open Three-Layer Waveguides

MATEC Web of Conferences, 2018
This paper describes the algorithm for the numerical solution of the diffraction problem of waveguide modes at the joint of two open planar waveguides. For planar structures under consideration, we can formulate a scalar diffraction problem, which is a ...
Divakov Dmitriy, Tiutiunnik Anastasiia, Sevastianov Anton   +2 more
doaj   +1 more source

Projection-based model-order reduction via graph autoencoders suited for unstructured meshes

Data-Centric Engineering
This paper presents the development of a graph autoencoder architecture capable of performing projection-based model-order reduction (PMOR) using a nonlinear manifold least-squares Petrov–Galerkin (LSPG) projection scheme.
Liam Magargal, Parisa Khodabakhshi, Steven Rodriguez, Justin Jaworski, John Michopoulos   +4 more
doaj   +1 more source

Projection-based reduced order modeling of an iterative scheme for linear thermo-poroelasticity

Results in Applied Mathematics
This paper explores an iterative approach to solve linear thermo-poroelasticity problems, with its application as a high-fidelity discretization utilizing finite elements during the training of projection-based reduced order models.
Francesco Ballarin, Sanghyun Lee, Son-Young Yi   +2 more
doaj   +1 more source