Listar GI-GMNE - Artigos por autor "Navarrina, Fermín"
Mostrando ítems 1-20 de 25
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A boundary element formulation for the substation grounding design
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 1999)[Abstract] A Boundary Element approach for the numerical computation of substation grounding systems is presented. In this general formulation, several widespread intuitive methods (such as Average Potential Method) can ... -
A boundary element numerical approach for earthing grid computation
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 1999)[Abstract] Analysis and design of substation earthing involves computing the equivalent resistance of grounding systems, as well as distribution of potentials on the earth surface due to fault currents [1,2]. While very ... -
A general numerical model for grounding analysis in layered soils
Colominas, Ignasi; Gómez Calviño, Javier; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 2002)[Abstract] Safety of persons, protection and equipment and continuity of power supply are the main objectives of the grounding system of a large electrical installation. For its accurate design, it is essential to determine ... -
A generalized statement for advective-diffusive phenomena. Finite element model and applications
Gómez, Héctor; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (John Wiley and Sons, 2000)[Abstract] Solving convective-diffusive transport problems is a frequent task in engineering, especially in convection dominated situations. Moreover, the standard statement for the transport problem leads to the result ... -
A high-order finite volume method with improved isotherms reconstruction for the computation of multiphase flows using the Navier–Stokes–Korteweg equations
Martínez, Abel; Ramírez, Luis; Nogueira, Xesús; Khelladi, Sofiane; Navarrina, Fermín (Elsevier, 2020)[Abstract] In this work we solve the Navier–Stokes–Korteweg (NSK) equations to simulate a two-phase fluid with phase change. We use these equations on a diffuse interface approach, where the properties of the fluid vary ... -
A Higher‑Order Chimera Method for Finite Volume Schemes
Ramírez, Luis; Nogueira, Xesús; Ouro, Pablo; Navarrina, Fermín; Khelladi, Sofiane; Colominas, Ignasi (Springer, 2018)[Abstract:] In this work a higher-order accurate finite volume method for the resolution of the Euler/Navier–Stokes equations using Chimera grid techniques is presented. The formulation is based on the use of Moving Least ... -
A Mathematical Model to Evaluate the Impact of the Maintenance Strategy on the Service Life of Flexible Pavements
Ruiz, Manuel; Ramírez, Luis; Navarrina, Fermín; Aymerich, Mario; López-Navarrete, David (Hindawi, 2019)[Abstract] The structural failure of a flexible pavement occurs when the accumulated fatigue damage produced by all the vehicles that have passed over each section exceeds a certain threshold. For this reason, the service ... -
A numerical formulation for grounding analysis in stratified soils
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (IEEE Power Engineering Society, 2002)[Abstract] The design of safe grounding systems in electrical installations is essential to assure the security of the persons, the protection of the equipment and the continuity of the power supply. In order to achieve ... -
Analysis of transferred earth potentials in grounding systems: a BEM numerical approach
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (IEEE Power Engineering Society, 2003)[Abstract] In this work we present a numerical formulation for the analysis of a common problem in electrical engineering practice, that is, the existence of transferred earth potentials in a grounding installation [1]. ... -
Boundary element formulation for the analysis of transferred potentials in electrical installations
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 2004)[Abstract] In this work we present a BEM numerical formulation for the analysis of a common problem in electrical engineering practice, that is, the existence of transferred earth potentials in a grounding installation ... -
Computer analysis of earthing systems in horizontally or vertically layered soils
Colominas, Ignasi; Gómez Calviño, Javier; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 2001)[Abstract] The main objectives of grounding systems are to guarantee the personal safety, the equipment protection and the continuity of the power supply. To attain these goals, the potential distribution on the earth ... -
Computer software for analysis and design optimization of power transmission structures by simulated annealing and sensitivity analysis
Couceiro, Iván; París, José; Navarrina, Fermín; Colominas, Ignasi; Martínez Varela, Santiago (Springer, 2021)[Abstract:] This paper presents a computer software for the optimization of power transmission structures. The software employs a modified version of the Simulated Annealing algorithm that has been proven effective in large ... -
Estimation of long-term fatigue damage of fixed substructures using fully-coupled models and non-linear dynamic analysis
Couceiro, Iván; París, José; Navarrina, Fermín; Colominas, Ignasi; Ramírez, Luis (Elsevier, 2020)[Abstract:] Typical industry models for Offshore Wind Turbines with fixed substructures are based on decoupled models between the wind turbine and the substructure. It is proved that the complete dynamic response of the ... -
Finite volume solvers and moving least-squares approximations for the compressible Navier-Stokes equations on unstructured grids
Cueto-Felgueroso Landeira, Luis; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 2005)[Abstract] This paper introduces the use of Moving Least-Squares (MLS) approximations for the development of high order upwind schemes on unstructured grids, applied to the numerical solution of the compressible Navier-Stokes ... -
Una formulación numérica general para el cálculo y diseño de tomas de tierra en grandes instalaciones eléctricas
Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Universitat Politècnica de Catalunya, 1997)[Resumen] La puesta a tierra de una instalación eléctrica es imprescindible para garantizar su seguridad cuando tienen lugar situaciones de fallo. Para su correcto análisis y diseño se requiere la determinación de una ... -
Una formulación numérica sin malla basada en los métodos SPH con ponderación de Galerkin
Cueto-Felgueroso Landeira, Luis; Colominas, Ignasi; Mosqueira Martínez, Gonzalo; Navarrina, Fermín; Casteleiro, Manuel (Universitat Politècnica de Catalunya, 2005)[Resumen] En este artículo se propone una formulación numérica sin malla de tipo Galerkin basada en el método de partículas SPH con aproximación de mínimos cuadrados móviles y su aplicación a problemas de mecánica de fluidos ... -
High order finite volume schemes on unstructured grids using Moving Least Squares reconstruction. Application to shallow water dynamics
Cueto-Felgueroso Landeira, Luis; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (John Wiley and Sons, 2005)[Abstract] This paper introduces the use of Moving Least Squares (MLS) approximations for the development of high-order finite volume discretizations on unstructured grids. The field variables and their succesive derivatives ... -
High Order Shape Design Sensitivity: A Unified Approach
Navarrina, Fermín; López Fontán, Santiago; Colominas, Ignasi; Bendito Pérez, Enrique; Casteleiro, Manuel (Elsevier, 2000)[Abstract] Three basic analytical approaches have been proposed for the calculation of sen- sitivity derivatives in shape optimization problems. The first approach is based on differentiation of the discretized equations ... -
Improved δ-SPH Scheme With Automatic and Adaptive Numerical Dissipation
Krimi, Abdelkader; Ramírez, Luis; Khelladi, Sofiane; Navarrina, Fermín; Deligant, Michaël; Nogueira, Xesús (MDPI, 2020)[Abstract] In this work we present a δ-Smoothed Particle Hydrodynamics (SPH) scheme for weakly compressible flows with automatic adaptive numerical dissipation. The resulting scheme is a meshless self-adaptive method, in ... -
Numerical Analysis and Safety Design of Grounding Systems in Underground Compact Substations
Guizán Roca, Raquel; Colominas, Ignasi; París, José; Couceiro, Iván; Navarrina, Fermín (Elsevier, 2022)[Abstract] This paper presents a mathematical and numerical formulation to design and analyze grounding systems in underground electrical substations. The developed approach is based on the well known Maxwell’s Equations. ...