25 anos do Bacharelado em Matemática Computacional da UFMG
Semana da MatComp: 18, 19 e 21 de novembro de 2024
Dia Comemorativo: 22 de novembro de 2024
HOMEPAGE: https://www.matcomp25anos.dcc.ufmg.br/
Palestra Convidada: "Eduardo Abreu: Análise numérica para modelos diferenciais: sinergia natural entre contínuo e discreto na matemática e aplicações"
LINK: https://www.matcomp25anos.dcc.ufmg.br/#palestras
The following work have been accepted for publication on "Numerical Methods for Partial Differential Equations" and it will available online soon (MNPDE, https://onlinelibrary.wiley.com/journal/10982426):
An enhanced Lagrangian-Eulerian method for a class of balance Laws: numerical analysis via a weak asymptotic method with applications
Eduardo Abreu, Eduardo Pandini and Wanderson José Lambert.
Highlights:
In this work, we designed and implemented an enhanced Lagrangian-Eulerian numerical method for solving a wide range of nonlinear balance laws, including systems of hyperbolic equations with source terms. We developed both fully discrete and semi-discrete formulations, and extended the concept of No-Flow curves to this general class of nonlinear balance laws. We conducted a numerical convergence study using weak asymptotic analysis, which involved investigating the existence, uniqueness, and regularity of entropy-weak solutions computed with our scheme. The proposed method is Riemann-solver-free. To evaluate the shock capturing capabilities of the enhanced Lagrangian-Eulerian numerical scheme, we carried out numerical experiments that demonstrate its ability to accurately resolve the key features of balance law models and hyperbolic problems. A representative set of numerical examples is provided to illustrate the accuracy and robustness of the proposed method.
ISAAC-ICMAM Conference of Analysis in Developing Countries 2024.
https://www.matua.edu.co/isaac-icmam-conference-of-analysis-in-developing-countries-2024/
The ISAAC-ICMAM (Virtual) Conference of Analysis in Developing Countries represents a significant collaboration between ISAAC and ICMAM Latin America. This jointly organized conference aims to share mathematical research in Latin America and the Caribbean, enhance its visibility, and foster collaboration among mathematicians from the region and worldwide.
During the conference, the following speak will be presented by Eduardo Abreu (Universidade Estadual de Campinas, UNICAMP, Brazil):
Title: A forward-tracking Lagrangian-Eulerian method for multidimensional systems of conservation laws
Abstract: We will discuss a forward Lagrangian-Eulerian approach to undertake a numerical-analytical study of inherent properties of multidimensional nonlinear hyperbolic conservation laws [(2024) https://doi.org/10.1016/j.cam.2023.115465]. It is widely known that their solutions can exhibit very complex behavior including the simultaneous presence of smooth waves, wave breaking, and shock waves. The novel forward tracking Lagragian-Eulerian formulation is based on the improved concept of no-flow curves. In the context of multidimensional hyperbolic systems of conservation laws, the resulting Lagrangian-Eulerian method satisfies a weak positivity principle in view of results of P. Lax and X.-D. Liu [Computational Fluid Dynamics Journal, 5(2) (1996) 133-156 and [Journal of Computational Physics, 187 (2003) 428-440]. We also found in [(2023) https://doi.org/10.1007/s10884-023-10283-1] a connection between the notion of no-flow curves, viewed as a vector field with locally bounded variation, and the results of A. Bressan in the context of existence and continuous dependence for discontinuous O.D.E.’s [Proc. Amer. Math. Soc. 104 (1988), 772-778]. We have tested the approach for well-known non-trivial muitlt-D systems and complex problems in fluid dynamics [(2023) https://doi.org/10.1016/j.amc.2022.127776, (2023) https://link.springer.com/article/10.1007/s10915-021-01712-8 , (2021) https://doi.org/10.1007/s10915-020-01392-w]: 4 by 4 compressible Euler equations (Double Mach Reflection problem and Mach 3 wind tunnel flow, the 3 by 3 shallow-water system with and without bottom topography, and the 8 by 8 Orszag-Tang vortex system in magnetohydrodynamics and a nonclassical 2 by 2 three-phase flow system of non strictly hyperbolic conservation laws with a resonance/umbilic point.
Matemáticas & Memoria: Un seminario de Análisis y Ecuaciones diferenciales para Latinoamérica.
El seminario «Matemáticas y memoria: un seminario de Análisis y Ecuaciones diferenciales para Latinoamérica» tiene como objetivo principal promover el intercambio de conocimientos y experiencias en el campo del análisis y las ecuaciones diferenciales, destacando la importancia de la memoria histórica en el desarrollo matemático de Latinoamérica. A través de la participación de invitados nacionales e internacionales, la visibilización de jóvenes talentos matemáticos y la invitación a reconocidos investigadores establecidos, se busca fomentar el diálogo académico y fortalecer la comunidad matemática regional.
Presentacíon de octubre: No-Flow Lagrangian-Eulerian Curves for Hyperbolic Conservation Laws. Eduardo Abreu (Universidade Estadual de Campinas, Brasil). LINK: https://youtu.be/HQMibFXNnUg
Se puede acceder a las demás presentaciones en Matemáticas y Memoria: Un seminario de Análisis y Ecuaciones diferenciales para Latinoamérica. – MATUA.
The following work have been accepted for publication on "Journal of Computational and Applied Mathematics" https://doi.org/10.1016/j.cam.2024.116325:
Semi-discrete Lagrangian-Eulerian approach based on the weak asymptotic method for nonlocal conservation laws in several dimensions
Eduardo Abreu, Richard A. De la Cruz Guerrero, Juan Carlos Juajibioy Otero and Wanderson José Lambert.
Highlights:
In this work, we have expanded upon the (local) semi-discrete Lagrangian-Eulerian method initially introduced in [E. Abreu, J. Francois, W. Lambert and J. Perez (2022), https://doi.org/10.1016/j.cam.2021.114011] to approximate a specific class of multi-dimensional scalar conservation laws with nonlocal flux. For completeness, we analyze the convergence of this method using the weak asymptotic approach introduced in [Eduardo Abreu, Mathilde Colombeau and Evgeny Yu Panov (2016), https://doi.org/10.1016/j.jmaa.2016.06.047], with significant results extended to the multidimensional nonlocal case. While there are indeed other important techniques available that can be utilized to prove the convergence of the numerical scheme, the choice of this particular technique (weak asymptotic analysis) is quite natural. This is primarily due to its suitability for dealing with the Lagrangian-Eulerian schemes proposed in this paper. Essentially, the weak asymptotic method generates a family of approximate solutions satisfying the following properties: 1) The family of approximate functions is uniformly bounded in the space L1(Rd) ∩ L∞(Rd) and 2) The family is dominated by a suitable temporal and spatial modulus of continuity. These properties allow us to employ the L1-compactness argument to extract a convergent subsequence. We demonstrate that the limit function is a weak entropy solution. Finally, we present a section of numerical examples in 1D and also in 2D for two-dimensional nonlocal Burgers equations to illustrate our results.
Mathematical Congress of the Americas 2025: July 21, 2025 – July 25, 2025
The goal of the Mathematical Congress of the Americas (MCA) is to internationally highlight the excellence of mathematical achievements in the Americas and foster collaborations among researchers, students, institutions and mathematical societies in the Americas.
LINK: https://www.mca2025.org/event/9e9666dd-2643-423b-b343-91f10f36e686/summary
Special Sessions: https://www.mca2025.org/event/9e9666dd-2643-423b-b343-91f10f36e686/websitePage:f3552742-6e9a-44e3-a319-6b6056ba9900
In the Mathematical Congress of the Americas (MCA), take a look at
Session 38: Conservation Laws: Mathematical and Numerical Analysis with Applications
Organizers:
Eduardo Abreu (Universidade Estadual de Campinas, Brazil, contact organizer)
Fabio Ancona (University of Padua, Italy)
Maria Teresa Chiri (Queen’s University, Canada)
Xiaoqian Gong (Amherst College, USA)
Michael Herty (RWTH Aachen University, Germany)
Brief Summary: Hyperbolic conservation laws have been subject to extensive analytical and numerical studies over the last decades. It is widely known that their solutions can exhibit very complex behavior including the simultaneous presence of smooth waves, wave breaking, and shock waves. These equations describe the conservation of some basic physical quantities of a system, and they arise in all branches of science and engineering: from fluid dynamics to vehicular traffic modeling. The scope of this Special Session is to bring together researchers with interests in the theoretical, applied, and computational aspects of hyperbolic partial differential equations with real-life applications and discuss the state of the art of the field.
In the perspective of accomplishing the goals of the 2025 Mathematical Congress of the Americas (MCA2025), the invited speakers are of different ages, nationalities, and different scientific career stages and they are selected among the leaders in the field. This aspect makes the Special Session suitable for training young researchers and fostering interactions between several mathematical communities across the Americas (South, Central and North).
The following work have been accepted for publication on "Computers and Mathematics with Applications" https://doi.org/10.1016/j.camwa.2024.04.015
Mathematical properties and numerical approximation of pseudo-parabolic systems
E. Abreu, E. Cuesta, A. Duran and W. Lambert.
Highlights:
The paper is concerned with the mathematical theory and numerical approximation of systems of partial differential equations (pde) of hyperbolic, pseudo-parabolic type. Some mathematical properties of the initial-boundary-value problem (ibvp) with Dirichlet boundary conditions are first studied. They include the weak formulation, well-posedness and existence of traveling wave solutions connecting two states, when the equations are considered as a variant of a conservation law. Then, the numerical approximation consists of a spectral approximation in space based on Legendre polynomials along with a temporal discretization with strong stability preserving (SSP) property. The convergence of the semidiscrete approximation is proved under suitable regularity conditions on the data. The choice of the temporal discretization is justified in order to guarantee the stability of the full discretization when dealing with nonsmooth initial conditions. A computational study explores the performance of the fully discrete scheme with regular and nonregular data.
Keywords: Pseudo-parabolic equations, spectral methods, error estimates, strong stability preserving methods, non-regular data.
VII Congresso Latino-Americano e do Caribe de Matemática CLAM 2024
https://www.umalca.org/2023/08/clam-2024/
Session title: "Conservation laws: mathematical analysis and industrial-based models"
LINK: http://www.mat.ufpb.br/clam/index.php/atividades/sessoes-tematicas
Coordinators:
Aparecido Souza - UFPB - Brazil
Úrsula Iturrarán Viveros - UNAM - México
Pablo Castañeda - ITAM - - México
Eduardo Abreu - IMECC-UNICAMP - Brazil
Aims and Scope: The objective of the thematic session entitled "Conservation laws: mathematical analysis and industrial-based models'', under the auspicious of the "VII Congreso Latinoamericano y del Caribe de Matemática'', is to bring together researchers from various fields with a central focus in mathematics with interests in the theoretical, applied, and computational aspects of hyperbolic partial differential equations and of related mathematical industrial-based models and some current trends. The research program focuses on an important synergy that engages several researchers and includes experts on modelling, analysis and computation to conservation laws. This aspect makes this field eminently suitable to train young researchers in and foster interactions between mathematical disciplines from an affirmative perspective to scientific development of countries in Latin American and Caribbean.
The following work have been accepted for publication on Communications in Nonlinear Science and Numerical Simulation (CNSNS; https://www.sciencedirect.com /journal/communications-in-nonlinear-science-and-numerical-simulation) and is now available online:
A relaxation approach to modeling properties of hyperbolic-parabolic type models
Eduardo Abreu, Wanderson Jose Lambert, Arthur Miranda do Espírito Santo and John Perez.
LINK: https://doi.org/10.1016/j.cnsns.2024.107967
Highlights:
• We propose a novel relaxation approach for modeling convection-diffusion problems via a hyperbolic system.
• The new system satisfies Liu’s sub-characteristic condition, ensuring solution stability.
• We apply the relaxation modeling to both classical and non-classical models.
• From numerical experiments, we verify the new system’s solutions converge to those of the original equations.
Keywords: Modeling using PDEs via Relaxation; Liu sub-characteristic condition; Convection-diffusion problems; Discontinuous flux function; Discontinuous coefficient in space; Numerical validation of models.
Workshop in complex fluids and solid mechanics II - June 13, 2024
https://w3.math.uminho.pt/~zecarlos/complex/#preprogram
Host institution: Department of Mathematics, School of Sciences, University of Minho
This is the second edition of the Workshop in Complex Fluids and Solid Mechanics, to be held at the Centre of Mathematics of the University of Minho in the 13th of June 2024.
Aims and Scope: Complex Fluids and Solid Mechanics are of great interest and relevance to scientific research, experimental technologies, and industrial applications. The main goal of this workshop is to foster discussion and collaboration among mathematicians with diverse backgrounds and a common interest in solving problems related to materials exhibiting complex behavior and properties.
We are pleased to share news from the ECCOMAS Congress 2024 to be held in Lisbon, Portugal, on 3th – 7th of June, 2024 and in particular the following Mini-Symposia:
MS215 - Advances in Numerical Methods for Shallow Water Equations and its Applications
Keywords: shallow water equations, computational fluid dynamics, free surface models
Organized by:
E. Bachini (University of Padua, Italy) and
M. Fois (Politecnico di Milano, Italy).
LINK: https://eccomas2024.org/event/area/4f3a2d93-5968-11ee-a4f3-000c29ddfc0c
MS005 - Deep Learning Computing
Keywords: Computing, Deep Learning, Partial Differential Equations
Organized by:
M. Castro (University of Malaga, Spain),
D. Pardo (University of the Basque Country (UPV/EHU), Spain) and
F. Chinesta (ENSAM Institute of Technology, France)
LINK: https://eccomas2024.org/event/area/4e9414ab-5968-11ee-a4f3-000c29ddfc0c
III Workshop de Equações Dispersivas da UFMG, 19 e 20 de fevereiro de 2024.
https://www.sites.google.com/view/3wed
O evento acontecerá na sala 3060 do Instituto de Ciências Exatas (ICEx).
O estudo das equações dispersivas não-lineares tem sido muito ativo nos últimos tempos. Equações desse tipo modelam diversos fenômenos em ciência natural, dentre eles podemos destacar a teoria de ondas em fluidos, óptica não-linear, mecânica quântica.
Para mais detalhes sobre o III Workshop de Equações Dispersivas da UFMG 2024, ver o site oficial do evento:
The following work have been accepted for publication on Journal of Hyperbolic Differential Equations (JHDE; https://www.worldscientific.com/doi/10.1142/S0219891624500012) and will available online soon:
Riemann problem solutions for a balance law under Dirac-Delta source with a discontinuous flux.
Eduardo Abreu, Vítor Matos, John Perez and Panters Rodriguez-Bermudez.
Keywords: Conservation laws; Discontinuous flux; δ-Dirac; Uniqueness of weak entropy solutions; Non viscous solutions; No-flow Lagrangian-Eulerian approach.
The following work have been published an it is now available in the latest volume of Journal of Computational and Applied Mathematics: Volume 437, February 2024, 115465, ISSN 0377-0427.
A triangle-based positive semi-discrete Lagrangian–Eulerian scheme via the weak asymptotic method for scalar equations and systems of hyperbolic conservation laws
Eduardo Abreu, Jorge Agudelo, John Pérez.
LINK: https://doi.org/10.1016/j.cam.2023.115465
Keywords: Hyperbolic conservation laws; Lagrangian–Eulerian method; Semi-discrete scheme on triangular grids; Weak asymptotic analysis; Kruzhkov entropy solution; Positivity principle
https://www.mathunion.org/icm/icm-2026
ICM 2026 will be hosted at the Pennsylvania Convention Center in Philadelphia over 23–30 July 2026.
The 20th IMU General Assembly will convene at the Marriott Marquis Times Square over 20–21 July 2026.
International Mathematical Union (IMU) Home ==> https://www.mathunion.org/
https://www.ime.unicamp.br/~viwfpde/
The VI Workshop on Fluids and PDE – Celebrating the 60th birthdays of Helena J. Nussenzveig Lopes and Milton C. Lopes Filho focusing on the major contributions of their work in the field of mathematical modeling and rigorous analysis of fluid dynamics problems, particularly incompressible flows with little regularity (non-smooth) and turbulent flows.
The conference will be held at the Institute of Mathematics, Statistics and Scientific Computing (IMECC) between 23rd and 27th October 2023 at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil, https://www.ime.unicamp.br/en.
A updated list of confirmed speakers at the VI Workshop on Fluids and PDE is now online:
LINK: https://www.ime.unicamp.br/~viwfpde/index.php/speakers/
The following work have been published and made available online during September 2023:
A study of non-equilibrium wave groups in two-phase flow in high-contrast porous media with relative permeability hysteresis
Eduardo Abreu, Paola Ferraz, Wanderson José Lambert.
LINK: https://doi.org/10.1016/j.cnsns.2023.107552
Keywords: Non-equilibrium two-phase flows, Relaxation hysteresis, High-contrast porous media, Analytical-numerical methods, Discontinuous flux and Projection relaxation method
Avaialble online on 25 September 2023
The following works have been published and made available online during July 2023:
On the well-posedness via the JKO approach and a study of blow-up of solutions for a multispecies Keller-Segel chemotaxis system with no mass conservation.
Julio C. Valencia-Guevara, John Pérez, Eduardo Abreu.
LINK: https://doi.org/10.1016/j.jmaa.2023.127602
Keywords: Blow-up Keller–Segel, Multispecies chemotaxis, JKO scheme, Optimal transport Wasserstein gradient flows, Multistep discretization, Numerical simulations.
Avaialble online on 18 July 2023
A triangle-based positive semi-discrete Lagrangian–Eulerian scheme via the weak asymptotic method for scalar equations and systems of hyperbolic conservation laws.
Eduardo Abreu, Jorge Agudelo, John Pérez.
LINK: https://doi.org/10.1016/j.cam.2023.115465
Keywords: Hyperbolic conservation laws, Lagrangian–Eulerian method, Semi-discrete scheme on triangular grids, Weak asymptotic analysis, Kruzhkov entropy solution, Positivity principle.
Avaialble online on 25 July 2023.
A new computational model for karst conduit flow in carbonate reservoirs including dissolution-collapse breccias.
Isamara Landim, Marcio A. Murad, Patricia Pereira, Eduardo Abreu .
LINK: https://doi.org/10.1007/s10596-023-10229-y
Keywords: Carbonates with karst cave conduits, Lower-dimensional model reduction, Collapse-breccia, Coupled 3D/1D flows, Non-linear Robin transmission condition, Hybridized mixed methods.
Avaialble online on 31 July 2023
The following work have been published and made available online during June 2023:
A Lagrangian-Eulerian Method on Regular Triangular Grids for Hyperbolic Problems: Error Estimates for the Scalar Case and a Positive Principle for Multidimensional Systems
Eduardo Abreu, Jorge Eliécer Agudelo, Wanderson José Lambert, John Pérez.
LINK: https://doi.org/10.1007/
Keywords: Conservation laws and first-order hyperbolic system, no-flow curves and triangular grids, vector fields with bounded directional variation, positive Lagrangian-Eulerian method, entropy measure-valued solutions and entropy process, a priori error estimates.
Avaialble online on 26 June 2023