A5011099376- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Rheology and Fluid Dynamics Studies
- Fluid Dynamics and Vibration Analysis
- Lattice Boltzmann Simulation Studies
- Heat Transfer Mechanisms
- Nanofluid Flow and Heat Transfer
- Wind and Air Flow Studies
- Advanced Numerical Methods in Computational Mathematics
- Meteorological Phenomena and Simulations
- Plasma and Flow Control in Aerodynamics
- Vibration and Dynamic Analysis
- Plant Surface Properties and Treatments
- Heat Transfer and Optimization
- Fluid Dynamics Simulations and Interactions
- Plant Water Relations and Carbon Dynamics
- Fluid Dynamics and Heat Transfer
- Flow Measurement and Analysis
- Gas Dynamics and Kinetic Theory
- Mosquito-borne diseases and control
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Mixing
- Ocean Waves and Remote Sensing
- Thermal Analysis in Power Transmission
- Aerodynamics and Acoustics in Jet Flows
Universidade de São Paulo
2015-2025
Universidade Federal do Pará
2025
Universidade Federal de São Carlos
2007-2024
Universidade Federal do Oeste da Bahia
2023
Brazilian Society of Computational and Applied Mathematics
2014-2021
Faculdade de Tecnologia e Ciências
2018
Universidade Estadual Paulista (Unesp)
2017-2018
Instituto de Aeronáutica e Espaço
2018
Universidade Federal Fluminense
2017
Universidad Externado de Colombia
2017
Abstract
This paper presents a methodology for estimating the pressure field from experimental velocity fields using physics-informed neural networks (PINNs). The proposed model estimates pressures directly raw data, without requiring boundary conditions or regular meshes. Manufactured solutions lid-driven cavity problem were employed to evaluate model's performance, demonstrating reasonable accuracy and minimal dependence on data refinement. Time-averaged vector of single-phase flows across tube...
Identifying the main taxonomic, phylogenetic and trait dimensions of beta diversity, evaluating their prospective drivers, advances our understanding patterns processes involved in evolution biological assemblages. Using comprehensive databases on distribution, phylogeny, morphological traits (later referred as functional traits) Amazonian freshwater fishes, we analyzed diversity these three to evaluate historical contemporary drivers. We mostly focused pure turnover components (Taxoβsim,...
This paper presents various finite difference schemes and compare their ability to simulate instability waves in a given flow field. The governing equations for two-dimensional, incompressible flows were solved vorticity–velocity formulation. Four different space discretization tested, namely, second-order central differences, fourth-order compact scheme sixth-order scheme. A classic Runge–Kutta was used time. influence of grid refinement the streamwise wall normal directions evaluated....
The accurate specific identification of ticks is essential for the study, control and prevention tick-borne diseases. Herein, we determined ribosomal nucleotide sequences second internal transcribed spacer (ITS2) 15 Neotropical hard tick species genus Amblyomma Koch found in Brazil. Most studied accidentally parasite humans potentially act as vectors zoonoses. Lengths ITS2 ranged from 956 to 1,207 bp, whereas GC content varied 62.4 66.9%. A matrix divergence was calculated with sequence data...
The laminar flow over a concave surface may undergo transition to turbulent state driven by secondary instabilities initiated the longitudinal vortices known as Görtler vortices. These distort boundary layer structure modifying streamwise velocity component in both spanwise and wall-normal directions. Numerical simulations have been conducted identify role of external pressure gradients development saturation results show that flows with adverse reach upstream from location for neutral...
The accurate specific identification of ticks is essential for the study, control and prevention tick-borne diseases. Herein, we determined ribosomal nucleotide sequences second internal transcribed spacer (ITS2) 15 Neotropical hard tick species genus Amblyomma Koch found in Brazil. Most studied accidentally parasite humans potentially act as vectors zoonoses. Lengths ITS2 ranged from 956 to 1,207 bp, whereas GC content varied 62.4 66.9%. A matrix divergence was calculated with sequence data...
Abstract This paper presents results on a verification test of Direct Numerical Simulation code mixed high‐order accuracy using the method manufactured solutions (MMS). is based formulation an analytical solution for Navier–Stokes equations modified by addition source term. The present numerical was aimed at simulating temporal evolution instability waves in plane Poiseuille flow. governing were solved vorticity–velocity two‐dimensional incompressible employed two different schemes. One used...
The centrifugal instability mechanism in boundary layers over concave surfaces is responsible for the development of counter- rotating vortices, aligned streamwise direction, known as Görtler vortices. These vortices create two regions spanwise upwash and downwash regions. region compressing layer towards wall, increasing drag coefficient heat transfer rate. does opposite. distort velocity profile wall-normal directions. distortions generate inflections distribution that are unstable to...
An atmospheric Internal Boundary Layer (IBL) occurs when sudden changes in surface roughness disturb wind flows. The region of the Brazilian Alcantara Space Center (ASC), with its rocket launching pad located 150 m downwind a 40 coastal cliff, presents formation an IBL due to winds blowing inland from ocean. Numerical simulations using immersed boundary method, experiments tunnel particle image velocimetry, and field observational data obtained anemometric towers were used study this IBL....
This work presents different formulations to obtain the solution for Giesekus constitutive model a flow between two parallel plates. The first one is formulation based on by Schleiniger, G; Weinacht, R.J., [Journal of Non-Newtonian Fluid Mechanics, 40, 79–102 (1991)]. second concept changing independent variable fluid components in terms this variable. change allows be obtained analytically, with exception velocity profile, which using high-order numerical integration method. last simulation...
Mixing layers are present in very different types of physical situations such as atmospheric flows, aerodynamics and combustion. It is, therefore, a well researched subject, but there aspects that require further studies. Here the instability two-and three-dimensional perturbations compressible mixing layer was investigated by numerical simulations. In code, derivatives were discretized using high-order compact finite-difference schemes. A stretching normal direction implemented with both...
The boundary layer over concave surfaces can be unstable due to centrifugal forces, giving rise Goertler vortices. These vortices create two regions in the spanwise direction−the upwash and downwash regions. region is responsible for compressing toward wall, increasing heat transfer rate. does opposite. In nonlinear development of vortices, it observed that becomes narrow spanwise−average rate higher than a Blasius layer. This paper analyzes influence wavelength transfer. equation written...
This work has as a fundamental objective the numerical study of effects synthetic jet actuators on flow boundary layer developed flat plate and hypothetical airfoil. The aim is to obtain computational data indicate how these may be used means control, describing dynamics in presence external flow. present paper uses spatial Direct Numerical Simulation (DNS) solve incompressible Navier-Stokes equations, written vorticity-velocity formulation. derivatives are discretized with sixth order...
Abstract This work presents a numerical method suitable for the study of development internal boundary layers (IBL) and their characteristics flows over various types coastal cliffs. The IBL is an important meteorological occurrence with surface roughness topographical step changes. A two‐dimensional flow program was used this study. governing equations were written using vorticity–velocity formulation. spatial derivatives discretized by high‐order compact finite differences schemes. time...
In this work, we implement models that are able to describe complex rheological behaviour (such as shear-banding and elastoviscoplasticity) in the HiGTree/HiGFlow system, which is a recently developed Computational Fluid Dynamics (CFD) software can simulate Newtonian, Generalised-Newtonian viscoelastic flows using finite differences hierarchical grids. The system uses moving least squares (MLS) meshless interpolation technique, allowing for more mesh configurations while still keeping...
The resulting wavelength of Görtler vortices in boundary layers over concave surfaces is determined by the upstream history flow and wall disturbances such as roughness, heating/cooling strips or suction blowing. In isotropic disturbance conditions, predominant wise corresponds to strongest growing vortex mode predicted linear stability theory. If environment not isotropic, with different from one highest growth rate may emerge. present investigation considers selection when are excited a...
Purpose The centrifugal instability mechanism of boundary layers over concave surfaces is responsible for the development quasi-periodic, counter-rotating vortices aligned in a streamwise direction known as Görtler vortices. By distorting layer structure both spanwise and wall-normal directions, may modify heat transfer rates. purpose this study to conduct spatial numerical simulation experiments based on vorticity–velocity formulation incompressible Navier–Stokes system equations quantify...