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Listar por autor "Chiva Vicent, Sergio"

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A CFD-DEM solver to model bubbly flow. Part I: Model development and assessment in upward vertical pipes

Peña-Monferrer, Carlos; Monrós Andreu, Guillem; Chiva Vicent, Sergio; Martinez-Cuenca, R.; Muñoz-Cobo, J. L. (Elsevier, 2018)

[EN] In the computational modeling of two-phase flow, many uncertainties are usually faced in simulations and validations with experiments. This has traditionally made it difficult to provide a general method to predict ...
A CFD-DEM solver to model bubbly flow. Part II: Critical validation in upward vertical pipes including axial evolution

Peña-Monferrer, Carlos; Monrós-Andreu, Guillem; Chiva Vicent, Sergio; Martinez-Cuenca, R.; Muñoz-Cobo, J. L. (Elsevier, 2018)

[EN] In the computational modeling of two-phase flow, many uncertainties are usually faced in simulations and validations with experiments. This has traditionally made it difficult to provide a general method to predict ...
A criterion for the transition from wall to core peak gas volume fraction distributions in bubbly flows

Méndez Díaz, Santos; Zenit, Roberto; Chiva Vicent, Sergio; Muñoz-Cobo, J.L.; Martinez-Martinez, Santiago (Elsevier, 2012)

[EN] It has been observed by many authors that for ascending bubbly flows, the gas fraction distributes radially in different manners. Depending on the flow conditions and channel characteristics, the bubbles may accumulate ...
Accelerating urban scale simulations leveraging local spatial 3D structure

Iserte, Sergio; Macías, Aina; Martínez-Cuenca, Raúl; Chiva, Sergio; Paredes Palacios, Roberto; Quintana-Ortí, Enrique S. (Elsevier, 2022-07)

[EN] This paper presents a hybrid methodology for accelerating Computational Fluid Dynamics (CFD) simulations intertwining inferences from deep neural networks (DNN). The strategy leverages the local spatial data of the ...
An Eulerian-Lagrangian open source solver for bubbly flow in vertical pipes

Peña Monferrer, Carlos; Muñoz-Cobo González, José Luís; Monrós Andreu, G.; Martinez Cuenca, R.; Chiva Vicent, Sergio (Sociedad Nuclear Española, 2014-10)

Air-water two-phase flow is present in natural and industrial processes of different nature as nuclear reactors. An accurate local prediction of the boiling flow could support safety and operation analyses of nuclear ...
An experimental investigation on the characteristics of submerged horizontal gas jets in liquid ambient

Harby Mohamed Abd Alaal, Khaled; Chiva Vicent, Sergio; Muñoz-Cobo González, José Luís (Elsevier, 2014-02)

Gas injections into liquid are prevalent in the natural environment and are essential in industrial applications, they can lead to complex flow. The flow structure and processes are essentially unsteady and turbulent. In ...
An experimental study on bubble entrainment and flow characteristics of vertical plunging water jets

Harby Mohamed Abd Alaal, Khaled; Chiva Vicent, Sergio; Muñoz-Cobo González, José Luís (Elsevier, 2014-09)

When a vertical liquid jet plunges into a liquid surface after passing through a surrounding gas phase it entrains a large amount of gas bubbles into the receiving pool, and forms a large submerged two-phase region with a ...
Assessment of a computational fluid dynamic (CFD) model for the IPR-R1 TRIGA research reactor

Martínez Lianes, Mónica; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Pereira, C.; Mesquita, A. Z.; Chiva Vicent, Sergio (American Nuclear Society, 2012-06)

This paper constitutes a first approach of the assessment of the ANSYS-CFX code to simulate the TRIGA research reactor. Due to computational limits simplifications of the core and of some other geometrical details ...
CFD modelling and validation of upward bubbly flow in an adiabatic vertical pipe using the quadrature method of moments

Peña Monferrer, Carlos; Passalacqua, Alberto; Chiva Vicent, Sergio; Muñoz-Cobo González, José Luís (Elsevier, 2016-05)

[EN] An Eulerian-Eulerian approach was investigated to model adiabatic bubbly flow with CFD techniques. In the framework of the OpenFOAM (R) software, a two-fluid model solver was modified to include a population balance ...
CFD Turbulence Study of PWR Spacer-Grids in a Rod Bundle

Peña Monferrer, Carlos; Muñoz-Cobo González, José Luís; Chiva Vicent, Sergio (Hindawi Publishing Corporation, 2014)

Nuclear fuel bundles include spacers essentially for mechanical stability and to influence the flow dynamics and heat transfer phenomena along the fuel rods. This work presents the analysis of the turbulence effects of a ...
CFD-Neutronic coupled calculation of a PWR fuel assembly considering pressure drop and turbulence produced by spacer grids

Peña-Monferrer, Carlos; Pellacani, F.; Chiva Vicent, Sergio; Barrachina Celda, Teresa María; Miró Herrero, Rafael; Macián-Juan, R. (Sne, 2012)

[EN] A computational code system called Coupled Solver ANSYS CFX/PARCS (CSAP) based on coupling the 3D neutron diffusion code PARCS v2.7 and the ANSYS CFX 13.0 Computational Fluid Dynamics (CFD) code has been developed ...
Characterization of the gas-liquid interfacial waves in vertical upward co-current annular flows

Cuadros-Orón, José Luis; Rivera-Durán, Yago; Berna, C.; Escrivá, A.; Muñoz-Cobo, J. L.; Monrós-Andreu, G.; Chiva, S. (Elsevier, 2019-05)

[EN] For more than fifty years, hundreds of research works have focused on the study of annular flow because of its huge importance in many industrial processes, for instance, chemical, petroleum, etc., being of particular ...
Computational fluid dynamics multiscale modelling of bubbly flow. A critical study and new developments on volume of fluid, discrete element and two-fluid methods

Peña Monferrer, Carlos (Universitat Politècnica de València, 2017-11-06)

The study and modelling of two-phase flow, even the simplest ones such as the bubbly flow, remains a challenge that requires exploring the physical phenomena from different spatial and temporal resolution levels. CFD ...
COUPLED LAGRANGE-EULER MODEL FOR SIMULATION OF BUBBLY FLOW IN VERTICAL PIPES CONSIDERING TURBULENT 3D RANDOM WALKS MODELS AND BUBBLES INTERACTION EFFECTS

Ali Abd El Aziz Essa ., Mohamed (Universitat Politècnica de València, 2012-12-07)

Una nueva aproximación euleriana-lagarangiana, en su forma de acople en dos vías, para la simulación de flujo de burbujas, agua-aire es presentada en la tesis, en la que se incluyen los efectos de las colisiones entre ...
Development and validation of a one-dimensional solver in a CFD platform for boiling flows in bubbly regimes

Gomez-Zarzuela-Quel, Consuelo; Chiva Vicent, Sergio; Peña-Monferrer, Carlos; Miró Herrero, Rafael (Elsevier, 2021-04)

[EN] This paper presents a new one-dimensional solver for two-phase flow simulations where boiling is involved. The solver has been implemented within the OpenFOAM® platform. The basic formulation follows the Eulerian description ...
Estudio del flujo bifásico aire-líquido en tuberías verticales: Base de datos experimental para la validación de programas CFD

Monrós, G.; Martínez, R.; Torro, S.; Chiva Vicent, Sergio; Peña Monferrer, Carlos; Muñoz-Cobo González, José Luís (Sociedad Nuclear Española, 2014-10)

El estudio del comportamiento del flujo multifásico y su modelado ha sufrido un gran cambio con la introducción de los programas CFD, y el avance en los sistemas de medida. La resolución temporal y espacial de los ...
Evaluación del Código de Dinámica de Fluidos Computacional (CFD) OPENFOAM en el estudio del estrés térmico presurizado de los reactores PWR. Comparación con el código comercial ANSYS-CFX

Martínez Lianes, Mónica; Barrachina Celda, Teresa María; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Chiva Vicent, Sergio (Sne, 2012-09)

En las instalaciones nucleares existe una larga trayectoria en el uso de códigos específicos como Trace, TRAC/BF1 o Relap5 para su simulación, validación y licenciamiento. Sin embargo, cada vez más, se usan los códigos ...
Experimental and CFD evaluation of ozone efficacy against coronavirus and enteric virus contamination on public transport surfaces

Falcó, Irene; Randazzo, Walter; Sánchez, Gloria; Vilarroig, José; Climent, Javier; Chiva, Sergio; Chica, Antonio; Navarro-Laboulais, J. (Elsevier, 2021-10)

[EN] The limited information about the routes of the transmission of SARS-CoV-2 within the ongoing pandemic scenario mobilized the administration, industry and academy to develop sanitation and disinfection systems for ...
Experimental and Theoretical Study of the Characteristics of Submerged Horizontal Gas Jets and Vertical Plunging Water Jets in Water Ambient

Harby Mohamed Abd Alaal, Khaled (Universitat Politècnica de València, 2012-12-07)

En este estudio se han construido dos diferentes instalaciones para investigar primero los chorros de gas horizontales y en segundo lugar los chorros verticales de agua que impactan sobre superficies libres de fluido, ...
Fluidodinámica computacional y sus aplicaciones en la industria nuclear

Aldama, Jorge; Batet, Lluís; Chiva Vicent, Sergio; Francisco Martín-Fuertes; Mas de les Valls,Elisabet; Miró Herrero, Rafael (Senda Editorial, 2014)

[ES] Los denominados códigos CFD o de fluidodinámica computacional se vienen aplicando cada vez con mayor frecuencia al análisis de procesos de sistemas de fluidos, en apoyo de tareas de diseño y análisis de ...