Carlos Alberto Dutra Fraga Filho

No Affiliation

Waste are the materials left over after the processing of ores. Significant disasters involving waste disposal structures have occurred in Brazil in recent years. Two tailings dam disasters occurred in 2015 and 2019 in the municipalities of Mariana and Brumadinho, respectively, in Minas Gerais, and caused severe damage by contaminating soil, rivers...

Waste is the materials left over after the processing of ores. Significant disasters involving waste disposal structures have occurred in Brazil in recent years and caused severe damage by contaminating soil, rivers and coastal areas, destroying native fauna and flora, interrupting the water supply and compromising its potability, putting the popul...

Oil spills at sea are a severe environmental concern. They can occur during the various stages of well-drilling, repair operations or transportation. The spreading of oil occurs due to the pollutant's tendency to flow over itself. Knowledge of its physical properties during the phenomenon, such as velocities and spatial positions, allows the timely...

Fluid-structure interaction occurs, for example, in wave impacts against reservoir walls, coastal structures (offshore platforms in the ocean, bridge piers, and breakwaters), coastal flooding, sloshing phenomenon, tsunamis, and biomedical applications. In the three-dimensional fluid-structure interaction simulation performed by the Lagrangian (mesh...

Plastic consumption continues to grow across the world. Plastic products have become pollutants that remain in the environment for a long time, sometimes up to hundreds of years, which causes great concern. Plastic materials persist in the environment for long periods, often hundreds of years, causing great concern due to their polluting action. Ma...

Fluid-structure interaction occurs, for example, in wave impacts against reservoir walls, coastal structures offshore platforms in the ocean, bridge piers, breakwaters), coastal flooding, sloshing phenomenon, tsunamis, and biomedical applications. In the threedimensional fluid-structure interaction simulation performed by the Lagrangian (meshfree)...

Fluid-structure interaction occurs, for example, in wave impacts against reservoir walls, coastal structures (offshore platforms in the ocean, bridge piers, breakwaters), coastal flooding, sloshing phenomenon, tsunamis, and biomedical applications. In the three- dimensional fluid-structure interaction simulation performed by the Lagrangian (meshfre...

Currently, there is not an extensive literature dedicated to the presentation of the diffusive modeling applied to the momentum equation of incompressible and isothermal Newtonian fluid flows solved by the smoothed-particle hydrodynamics (SPH) method. This paper aims to present the most common viscosity modelings and the LES (Large Eddy Simulation)...

A Correction to this paper has been published: https://doi.org/10.1007/s11356-021-14684-x

Negative impacts are caused by oil spills on coastal ecosystems. In the phenomenon of oil spreading, the knowledge of the physical properties of the pollutant, such as velocities and positions, is of fundamental importance for the adoption of timely contingency measures to protect the environment (Fraga Filho, Smoothed Particle Hydrodynamics: Funda...

Mesh-free particle methods applied to continuum fluid dynamics still use fictitious, ghost or virtual particles, and/or molecular dynamics concepts in the treatment of the boundaries. The aim of this paper is to present the implementation of the physical reflective boundary conditions (RBC), based on Newton’s restitution law and the foundations of...

Meshfree particle methods are being increasingly employed in solving problems in automotive, aeronautics and oil industries, environmental and geophysical problems, biomechanics and medicine, hydraulic erosion, sediment transport, physics and astronomy, among other areas. Regardless of the application of the particle method, the search for neighbou...

This paper aims to discuss the boundary conditions techniques employed in the solution of physical and engineering problems using the Lagrangian particle approach in continuum mechanics. Simulations using different boundary treatment techniques have been performed, and in addition, a review of the literature on the techniques commonly employed in S...

This chapter brings some applications of the SPHd method in transport phenomena and continuum fluid mechanics problems. The physical-mathematical modellings, the boundary treatment techniques implemented and the results achieved are presented and discussed. Four cases are studied: heat diffusion in a flat plate, still fluid at rest within an immobi...

In this chapter, the basic concepts of the SPH method and its application in the discretization of the continuum domain in particles are presented. The SPH approximations of the equations of conservation are deduced and explained. Kernels used in interpolations, temporal integration methods, the particle inconsistency problem and numerical correcti...

This chapter presents the continuum hypothesis, that enables that the three fundamental physical conservation laws (mass, momentum and energy) can be representated by mathematical partial differential equations. Basic concepts that differentiate the microscopic molecular and macroscopic continuum scales are discussed for the first time. Besides, th...

This book is based on results obtained over a decade of study and research. It questions the use of dynamic molecular models in the continuum scale providing alternative solutions to open problems in the literature. It provides a physical-mathematical understanding of the differential equations that govern fluid flow and energy transport, serving a...

SPH is a recent particle method applied in the cavities study, without many results available in the literature. The lid-driven cavity flow is a classic problem of the fluid mechanics, extensively explored in the literature and presenting a considerable complexity. The aim of this paper is to present a solution from the Lagrangian viewpoint for thi...

Neste trabalho é utilizado o método SPH que é lagrangiano e sem malha. Por meio do modelo ruptura de barragem e o software SPHysics, uma análise de aspectos importantes do método SPH é desenvolvida. É sabido que as principais dificuldades deste método estão relacionadas com a ordem de consistência, tratamento de fronteiras e comportamento do escoam...

The aim of this paper is to present a computational algorithmic implementation of physical reflective boundary conditions and applications, for use in particle methods. It is motivated by the lack of a straightforward study in the literature dedicated to the presentation of this reflective boundary condition, based on Newton’s restitution law and t...

Particle methods are an alternative to the traditional mesh Eulerian methods for solution of fluid dynamics and transport phenomena problems. The Lagrangian Meshless Smoothed Particle Hydrodynamics (SPH) method presents advantages compared to mesh methods as a better visualisation of the spatio-temporal evolution of the flow (and the fluid properti...

In this paper, the Smoothed Particle Hydrodynamics Method was applied for the study of heat diffusion in a homogeneous flat plate subjected to the Dirichlet boundary condition. The numerical simulations by the SPH method have been performed using different interpolation functions (kernels), discretizations of the domain by particles and a proposed...

In this paper, the Lagrangian Smoothed Particle Hydrodynamics (SPH) method (with different combinations of smoothing functions/numbers of particles), the Eulerian Finite-Volume method using different refinements of the meshes and the Analytical method were applied for the study of heat diffusion. The numerical simulations by the SPH method have bee...

The objectives of this work were: to design and build material specimens which behave, under mechanical loading, such as functionally graded materials; to perform dynamic vibration tests on the produced specimens, and; to numerically simulate the vibration tests in order to validate a proposed numerical model for functionally graded materials chara...