Article
Computer Science, Interdisciplinary Applications
Nian Yu, Ruiheng Li, Wenxin Kong, Lei Gao, Xialan Wu, Enci Wang
Summary: This paper proposes a finite element approach based on a hybrid grid for handling deviations in magnetotelluric forward modeling. By using a combination of prismatic and tetrahedral elements, this method can reduce the number of elements and degrees of freedom while maintaining high accuracy, thus improving computational efficiency.
COMPUTERS & GEOSCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
S. Bondua, V Bortolotti, P. Macini, K. Strpi
Summary: This paper presents new versions of VORO2MESH and TOUGH2Viewer software for generating Voronoi grids for MODFLOW. Two case studies have been conducted and compared with analytical solutions. The results show that VORO2MESH grids produce simulation results very close to locally refined grids created using the Quadtree approach, and simulation activities are substantially improved using TOUGH2Viewer.
ENVIRONMENTAL MODELLING & SOFTWARE
(2023)
Article
Computer Science, Interdisciplinary Applications
N. Yavich, N. Koshev, M. Malovichko, A. Razorenova, M. Fedorov
Summary: In this paper, the performance of the mixed-hybrid finite element method (MHFEM) for EEG and MEG modeling is assessed. The study concludes that although MHFEM is computationally demanding, it improves the accuracy of modeling on low-resolution head models compared to the conventional nodal finite element method (P-1 FEM).
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Computer Science, Interdisciplinary Applications
Zedong Chen, Fan Zhang, Jun Liu, Biaosong Chen
Summary: Recently, a vertex-based spatial reconstruction method has been proposed for unstructured cell-centered finite volume method, showing advantages in accuracy, convergence, and efficiency. This method has been extended for the solution of viscous flows and includes a WENO-type nonlinear weighting strategy to replace conventional slope limiters. The method also incorporates an iterative near-boundary treatment to ensure linear exactness near boundaries without sacrificing computational efficiency. Numerical tests demonstrate the superior performance of the method in solving viscous flows and shock waves, particularly on high aspect-ratio irregular triangular grids.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Hiroaki Nishikawa
Summary: This paper proposes a flux correction technique for achieving second-order accuracy on arbitrary polyhedral grids involving non-planar faces. The technique is derived from the k-exact finite-volume discretization approach and addresses the missing term in other practical finite-volume discretizations. It demonstrates the importance of a consistent definition of a control volume for achieving second-order accuracy.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Multidisciplinary
Shahid Manzoor, Michael G. Edwards, Ali H. Dogru
Summary: Novel three-dimensional unstructured grid generation methods are proposed in this study, which automate control-volume boundary alignment to geological features and enable control point alignment to complex wells, resulting in essentially perpendicular grids. The comparative performance study of cell-vertex versus cell centered control-volume distributed multi-point flux approximation (CVD-MPFA) finite-volume formulations demonstrates that the vertex-centered CVD-MPFA methods outperform the cell-centered methods in terms of accuracy and efficiency.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
L. Campoli, A. Assonitis, M. Ciallella, R. Paciorri, A. Bonfiglioli, M. Ricchiuto
Summary: UnDiFi-2D is an open source unstructured grid code designed to model gas-dynamic discontinuities in two-dimensional flows. It needs to be coupled with a CFD solver and features modular design, usability, maintenance, and open source licensing.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Computer Science, Interdisciplinary Applications
Walter Boscheri, Raphael Loubere, Pierre-Henri Maire
Summary: This paper presents a conservative cell-centered Lagrangian Finite Volume scheme for solving hyperelasticity equations on unstructured multidimensional grids. By combining Multidimensional Optimal Order Detection (MOOD) limiting strategy and Arbitrary high order schemes using DERivatives (ADER) approach, the method ensures robustness and stability at shock waves while achieving second-order accuracy in time. The approach has been successfully tested in a hydrodynamics context and aims to extend to hyperelasticity with nodal solver and Geometrical Conservation Law compliance.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Environmental Sciences
Feng Peng, Xiaoli Hao, Fuxin Chai
Summary: A GPU-accelerated 2D shallow flow model is developed in this study to overcome the computational cost limitation of numerical overland flow models. The model uses a Godunov-type finite volume method to solve shallow water equations with unstructured grids, considering rainfall, infiltration, bottom slope, and friction source terms. The simulation demonstrates the well-balanced and robust properties of the model, and its accuracy and stability are further demonstrated in an urban rain-runoff and flood experiment. Programmed with CUDA, the model achieves significant acceleration with multi-thread GPU computation technology, achieving a speeding up ratio of approximately 75 compared to single-thread CPU in dam-break flow for large-scale applications.
Article
Mathematics, Applied
Stamatios Amanatiadis, Theodoros Zygiridis, Nikolaos Kantartzis
Summary: This work discusses the accurate modeling of curved graphene layers for time-domain electromagnetic simulations, presenting the advanced properties of graphene and examining the implementation of an unstructured triangular grid. Different techniques were proposed for sampling the magnetic field components, with considerations on accuracy and stability. The updating equations in the time-domain were derived via appropriate approximation of Maxwell equations, and the methodology was validated through comparison with theoretical values and error determination.
Article
Computer Science, Interdisciplinary Applications
Cristian Mejia, Deane Roehl, Julio Rueda, Roberto Quevedo
Summary: This paper proposes a new embedded fracture approach for fluid flow in highly fractured porous media, which includes condensation technique to merge fracture contributions into continuum elements and guarantee compatibility between fractures and porous matrix within a standard finite element mesh. Despite its simplicity, the method demonstrates robustness and applicability to highly fractured rock reservoir cells with random fracture orientation. The pore pressure field obtained with this approach closely matches predictions from explicit approaches with zero-thickness interface elements, showing promising results.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Physics, Fluids & Plasmas
Lei Xu, Rongliang Chen, Xiao-Chuan Cai
Summary: This paper presents a novel finite-volume discrete Boltzmann method for inviscid compressible flows, which is validated through seven benchmark problems. The method demonstrates close to linear strong scalability in parallel implementation.
Article
Chemistry, Multidisciplinary
Siyuan Sun, Changchun Yin, Xiuhe Gao
Summary: This study addresses the challenges in inversion modeling on unstructured grids and proposes a new gradient scheme and improved fuzzy c-means clustering method to effectively solve the problems and enhance model continuity.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Petroleum
I Shovkun, H. A. Tchelepi
Summary: The study aims to develop a spatial discretization scheme that cuts the matrix grid with fracture planes to model fluid flow and mechanical deformation in fractured reservoirs. It utilizes traditional formulations and numerical harmonic shape functions to accurately describe the behavior of fractured formations. The proposed approach is validated and compared with existing methods, demonstrating its feasibility and effectiveness.
Article
Computer Science, Software Engineering
Samer Alhaddad, Jens Foerstner, Stefan Groth, Daniel Gruenewald, Yevgen Grynko, Frank Hannig, Tobias Kenter, Franz-Josef Pfreundt, Christian Plessl, Merlind Schotte, Thomas Steinke, Jurgen Teich, Martin Weiser, Florian Wende
Summary: This article introduces the HighPerMeshes DSL, a C++-embedded domain-specific language aimed at improving productivity in code development on multiple target platforms. The usage of HighPerMeshes DSL is demonstrated with three examples, showing the mapping of abstract algorithmic descriptions onto parallel hardware. Performance and scalability of different example problems are also demonstrated.
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE
(2022)