A5065310241- Computational Fluid Dynamics and Aerodynamics
- Lattice Boltzmann Simulation Studies
- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Heat Transfer
- Fluid Dynamics Simulations and Interactions
- Rheology and Fluid Dynamics Studies
- Coronary Interventions and Diagnostics
- Fluid Dynamics and Vibration Analysis
- Advanced Numerical Methods in Computational Mathematics
- Nonlinear Dynamics and Pattern Formation
- Fluid Dynamics and Thin Films
- Surface Modification and Superhydrophobicity
- Wind and Air Flow Studies
- Fluid Dynamics and Mixing
- Meteorological Phenomena and Simulations
- Numerical methods for differential equations
- Gas Dynamics and Kinetic Theory
- Nanofluid Flow and Heat Transfer
- Anaerobic Digestion and Biogas Production
- Aerodynamics and Acoustics in Jet Flows
- Aerosol Filtration and Electrostatic Precipitation
- Rocket and propulsion systems research
- Advanced Mathematical Modeling in Engineering
- Particle Dynamics in Fluid Flows
- Groundwater flow and contamination studies
Universidade do Estado do Rio de Janeiro
2015-2024
Universidade Federal da Paraíba
2018
National Institute for Space Research
2015
Universidade Federal do Rio de Janeiro
2000-2008
Laboratoire Interfaces et Systèmes Électrochimiques
2008
Centre National de la Recherche Scientifique
2008
Japan External Trade Organization
2005
Brazilian Society of Computational and Applied Mathematics
2002-2004
Universidade de São Paulo
2000-2004
Universidade Federal de São Carlos
2002
The response of wall-flow turbulence to high-frequency spanwise oscillations was investigated by direct numerical simulations a planar channel flow subjected either an oscillatory cross-flow or the motion wall. Periods oscillation, Tosc+=Toscuτ2/ν, ranging from 25 500 were studied. For 25≤Tosc+≤200 turbulent bursting process suppressed, leading sustained reductions 10% 40% in drag and comparable attenuations all three components intensities as well Reynolds shear stress. Oscillations at...
Abstract A numerical method for solving three‐dimensional free surface flows is presented. The technique an extension of the GENSMAC code calculating in two dimensions. As GENSMAC, full Navier–Stokes equations are solved by a finite difference method; fluid represented piecewise linear composed quadrilaterals and triangles containing marker particles on their vertices; stress conditions accurately imposed; conjugate gradient employed discrete Poisson equation arising from velocity update;...
We seek to study numerically two-phase flow phenomena with phase change through the finite-element method (FEM) and arbitrary Lagrangian–Eulerian (ALE) framework. This is based on so-called "one-fluid" formulation; thus, only one set of equations used describe field at vapor liquid phases. The are discretized an unstructured tetrahedron mesh interface between phases defined by a triangular surface, which subset three-dimensional mesh. Navier–Stokes equation model fluid inclusion source term...
Anaerobic digestion has been widely applied for waste treatment, renewable energy generation and biofertilizer production. The biogas potential in Brazil is sizable, but the state of Rio de Janeiro largely dependent on fossil fuels, there a lack assessments state. Thus, this study evaluated biomethane, electricity potentials region. Three different scenarios biomass supply were considered four major biowaste streams: sewage sludge; cattle manure; sugarcane processing waste; food waste....
Abstract This work is concerned with the computation of incompressible axisymmetric and full three‐dimensional free‐surface flows. In particular, circular‐hydraulic jump simulated compared approximate analytic solutions. However, principal thrust this paper to provide a real problem as test bed for comparing many existing convective approximations. Their performance compared; SMART, HLPA VONOS emerge acceptable upwinding methods problem. Copyright © 2002 John Wiley & Sons, Ltd.
The dynamics of subgrid-scale energy transfer in turbulence is investigated a database planar turbulent jet at Re λ ≈ 110, obtained by direct numerical simulation. In agreement with analytical predictions (Kraichnan 1976), found to arise from two effects: one involving non-local interactions between the resolved scales and disparate subgrid scales, other local near cutoff. former gives rise positive, wavenumber-independent eddy-viscosity distribution spectral space, manifested as...
AbstractThis study analyzed the temporal variability of phytoplankton assemblages in surface waters Guanabara Bay (RJ, Brazil), at six stations front Icaraí Inlet from April/2011 to April/2012. Our results highlight great contribution diatoms, dinoflagellates and cyanobacteria, represented by 111 taxa typical estuarine coastal areas. The coexistence benthic planktonic species suggests considerable hydrodinamism these waters. All variables were homogeneous (p > 0.05) between stations, but...
This work presents a method for simulating axisymmetric and planar free-surface flows dominated by surface tension forces. The effects are incorporated into the free boundary conditions through computation of capillary pressure. required curvature is evaluated fitting least squares curve to using tracking markers in cell its close neighbors. To avoid short wavelength perturbations on surface, mass-conserving local four-point stencil filter employed. an extension trapezoidal subgrid...
Abstract This paper is concerned with the numerical solutions of time dependent two‐dimensional incompressible flows. By using primitive variables velocity and pressure, Navier–Stokes mass conservation equations are solved by a semi‐implicit finite difference projection method. A new bounded higher order upwind convection scheme employed to deal non‐linear (advective) terms. The procedure an adaptation GENSMAC ( J. Comput. Phys. 1994; 110 :171–186) methodology for calculating confined free...
The Anaerobic Digestion Model No. 1 (ADM1) was employed to simulate methane (CH 4 ) production in an anaerobic reactor (AR), and the associated bench-scale biochemical potential (BMP) assay, having sewage sludge (SWS) from a municipal wastewater treatment plant (WWTP) as feedstock. SWS presented following physical-chemical characteristics: pH (7.4–7.6), alkalinity (2,382 ± 100 mg CaCO3 L −1 ), tCOD (21,903 1,000 TOC (895 TS, TVS, VSS (2.0%, 1.1%, 0.8%, respectively). BMP assay conducted six...
Abstract This paper presents a finite difference technique for solving incompressible turbulent free surface fluid flow problems. The closure of the time‐averaged Navier–Stokes equations is achieved by using two‐equation eddy‐viscosity model: high‐Reynolds k –ε (standard) model, with time scale proposed Durbin; and low‐Reynolds number form standard similar to that Yang Shih. In order achieve an accurate discretization non‐linear terms, second/third‐order upwinding adopted. computational...
Abstract In this work, the finite volume method is used to numerically solve fluid governing equations of filling phase thermoplastic injection in a narrow gap with free surfaces, subject heat transfer, using semi‐Lagrangian formulation an unstructured mesh. The modified‐Cross model Arrhenius temperature dependence employed describe viscosity melt. pressure field obtained control element method. three‐dimensional solved by scheme based on A simpler two‐dimensional for also deduced and...