Norberto M. Nigro
YOU?
Author Swipe
Struggling with the Modeling of Boundary Layers in Coarse Grids with the Pseudo-Direct Numerical Simulation Method (P-DNS) Open
Flow regions near solid surfaces are strongly dominated by viscosity effects and greatly affected by the near-wall pressure field. The velocity profiles are far from linear and the associated furbulence level and characteristics vary very …
A multiscale Pseudo-DNS approach for solving turbulent boundary-layer problems Open
Efficiently simulating turbulent fluid flow within a boundary layer is one of the major challenges in fluid mechanics. While skin friction may have a limited impact on drag at high Reynolds numbers, it plays a crucial role in determining t…
Analysis of Energy Efficiency in a Test Engine with Different Fuel Formulations Through Experimental Tests and Numerical Diagnostics Open
This study conducted experimental tests to investigate alternative fuels to gasoline and their impact on the efficiency of internal combustion engines. A total of 36 tests were carried out using five types of fuels, optimizing the mixtures…
PDNS: A Novel Turbulence Model Suitable for Coarse Meshes Applied to Flows with Strong Pressure Gradients Around Airfoils Open
Turbulence models require specific considerations for regions near solid walls due to the presence of boundary layers. Achieving accurate estimations of wall shear stress require a sufficiently refined mesh capable of capturing the laminar…
Development of a simple turbulent diffusivity expression in the context of relative turbulent dispersion Open
Modeling turbulent fluxes in RANS (Reynolds-Averaged Navier-Stokes) equations is a nontrivial task. Unlike molecular diffusion, turbulent scales are tipically not well separated from those over which mean properties vary, and therefore the…
Thermal-hydraulic 0D/3D coupling in OpenFOAM: Validation and application in nuclear installations Open
The nuclear safety assessment involving large transient simulations is forcing the community to develop methods for coupling thermal-hydraulics and neutronic codes and three-dimensional (3D) Computational Fluid Dynamics (CFD) codes. In thi…
The Pseudo-Direct Numerical Simulation Method considered as a Reduced Order Model Open
The multiscale method called Pseudo-Direct Numerical Simulation (P-DNS) is presented as a Reduced Order Model (ROM) aiming to solve problems obtaining similar accuracy to a solution with many degrees of freedom (DOF). The theoretical basis…
Validation and Enhancement of a Supermesh Strategy for the CFD Simulation of Four-Stroke Internal Combustion Engines Open
The present paper describes and validates an efficient CFD implementation to replicate the working fluid-dynamics of a real four-stroke internal combustion engine. To do this, experimental data obtained on a single-cylinder engine are used…
A CFD Comparative Study of Bubbling Fluidized Bed Behavior with Thermal Effects Using the Open-Source Platforms MFiX and OpenFOAM Open
This work studies the performance of two open-source CFD codes, OpenFOAM and MFiX, to address bubbling fluidized bed system at different temperature and heat transfer conditions. Both codes are used to predict two parameters that are relev…
Discrete and Continuum Approaches for Modeling Solids Motion Inside a Rotating Drum at Different Regimes Open
In this work, the performance of discrete and continuum computational models for addressing granular flow dynamics in a rotating drum at different regimes is studied. The results are compared to the experimental observations obtained by im…
The performance of the <i>µ</i>(<i>I</i>)-rheology model on flat bottom silos discharge Open
The aim of this work is to explore the capability of the µ ( I )-rheology model and its numerical implementation in addressing a silo discharge problem by computational simulation. In order to do so, the model was implemented in the genera…
MESH RESOLUTION EFFECTS ON PRIMARY ATOMIZATION SIMULATIONS Open
International audience
Simulation and Experimental Study of the Heat Flow Through the Walls of an Internal Combustion Engine Open
This work presents the first stage of a broader experimental and numerical study of the heat flux through the walls of an internal combustion engine running under low carbon footprint alternative fuels. Heat losses during engine operation …
Advances in the Pseudo-DNS Methodology: Database Construction for the Averaged Inertial Stresses on the Internal RVE Open
Pseudo Direct Numerical Simulation (pseudo-DNS) is a novel concurrent multiscale methodology which splits the numerical solution into two: the coarse and the fine parts. Here, the coarse scale solution is computed as usual using a relative…
Algorithms for flux computing in VOF-PLIC solvers on parallel facilities using arbitrary time steps Open
Computing fluxes in Volume of Fluid solvers by Piecewise Linear Interface Reconstruction on parallel facilities is a challenging task, particularly when arbitrary time steps are used. The process requires the use of raytracing techniques t…
DNS Simulations of Couette Flow at Low Reynolds Numbers Using OpenFOAM for Obtaining Effective Viscosities for a New Turbulent Model Open
This paper presents an initial stage of a new turbulent model based on effective viscosities. The model proposes solving a “global” problem using a relatively thick mesh with a pseudofluid with precalculated effective viscosities. These vi…
Behaviour of Pairs of Bubbles in Buoyancy - Preliminary Study Open
This work details the analysis of a pair of 1mm diameter air bubbles raising in water due to buoyancy. The main objective of this study is to validate the Gerris Flow Solver as a simulation tool for this problem and with the aim to use it …
A Particle-Based Method for the Solution of Turbulent Fluid Flows Open
Although the Navier-Stokes equations are equivalently applicable to both laminar and turbulent fluid flows, the current computing power generally precludes employing fine meshes that would allow to simulate turbulent flows without introduc…
Transient Numerical Assessment of Race Car Dry-Sump Oil Under Extreme Maneuvers Open
A numerical assessment of a dry-sump oil system was performed by Computational Fluid Dynamics (CFD). Unlike conventional cars, race cars are subjected to high accelerations that induce oil sloshing. Hence, dry-sump oil systems are required…
Bag mode breakup simulations of a single liquid droplet Open
International audience
A Technical, Environmental and Financial Analysis of Hybrid Buses Used for Public Transport Open
This paper presents a technical, financial and environmental analysis of four different hybrid buses operated under Buenos Aires driving conditions. A conventional diesel bus is used as reference and three electric hybrids equipped with di…