Exploració per autor "Pérez Segarra, Carlos David"
Ara es mostren els items 53-72 de 151
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Fixed grid numerical modelling of frost growth and densification
Bartrons Casademont, Eduard; Galione, Pedro; Pérez Segarra, Carlos David (2019-03)
Article
Accés obertA fixed-grid-porous-media method capable of simulating the growth and densification of frost sheets is here presented. A velocity field is calculated across the entire domain, in which a porous media treatment is given to ... -
Flamelet mathematical models for non-premixed laminar combustion
Carbonell Sánchez, Daniel; Pérez Segarra, Carlos David; Coelho, P.J.; Oliva Llena, Asensio (2009-02-01)
Article
Accés restringit per política de l'editorialDetailed numerical calculations based on the solution of the full transport equations have been compared with flamelet calculations in order to analyse the flamelet concept for laminar diffusion flames. The goal of this ... -
Flow and heat transfer in a wall-bounded pin matrix
Paniagua Sánchez, Leslye; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (Begell House, 2012)
Text en actes de congrés
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From extruded-2D to fully-3D geometries for DNS: a multigrid-based extension of the Poisson solver
Gorobets, Andrei; Trias Miquel, Francesc Xavier; Soria Guerrero, Manel; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2010)
Article
Accés restringit per política de l'editorialDirect numerical simulation (DNS) of incompressible flows is an essential tool for improving the understanding of the physics of turbulence and for the development of better turbulence models. The Poisson equation, the ... -
Frost formation: optimizing solutions under a finite volume approach
Bartrons Casademont, Eduard; Pérez Segarra, Carlos David; Oliet Casasayas, Carles (Institute of Physics (IOP), 2016)
Text en actes de congrés
Accés obertA three-dimensional transient formulation of the frost formation process is developed by means of a finite volume approach. Emphasis is put on the frost surface boundary condition as well as the wide range of empirical ... -
Heat and moisture insulation by means of air curtains: application to refrigerated chambers
Giráldez García, Héctor; Pérez Segarra, Carlos David; Oliet Casasayas, Carles; Oliva Llena, Asensio (Elsevier, 2016-08)
Article
Accés obertThe present study is devoted to the determination of the efficiency of air curtain units (ACUs) applied to heat and moisture insulation of refrigerated chambers. A detailed study of the fluid dynamics and heat and mass ... -
Implementation of two-equation soot flamelet models for laminar diffusion flames
Carbonell Sánchez, Daniel; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2009-01-01)
Article
Accés restringit per política de l'editorialThe two-equation soot model proposed by Leung et al. [K.M. Leung, R.P. Lindstedt, W.P. Jones, Combust. Flame 87 (1991) 289–305] has been derived in the mixture fraction space. The model has been implemented using both ... -
Improved semi-analytical method for air curtains prediction
Giráldez García, Héctor; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2013-11)
Article
Accés restringit per política de l'editorialThe present study is devoted to the analysis and prediction of the efficiency of air curtains. The attention is focused on improving existing semi-analytical methods with the information from CFD simulations and experimental ... -
Improvements on the numerical analysis of viscoplastic-type non-Newtonian fluid flows
Carmona Muñoz, Ángel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2014)
Text en actes de congrés
Accés obertThe aim of this work is to delve into the numerical analysis of viscoplastic-type non-Newtonian fluid flows with the objective of carrying out more advanced numerical simulations for them. Specifically, improvements in the ... -
Influence of rotation on the flow over a cylinder at Re=5000
Aljure Osorio, David E.; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015-10-15)
Article
Accés restringit per política de l'editorialThe influence of the rotation ratio on the forces acting on a circular cylinder at Re ¼ 5000 has been investigated by means of direct numerical simulations (DNS). Spin ratios in the range 0-5 have been considered. The ... -
Influence of rotation on the flow over cylinder at RE=5000
Aljure Osorio, David E.; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2014)
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Large eddy simulation model assessment of the turbulent flow through dynamic compressor valves
Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2013)
Text en actes de congrés
Accés restringit per política de l'editorialThe present paper attempts the dynamic simulation of the fluid flow through the valve reed taking into account valve movement due to piston displacement. This work widens previous studies based on numerical experiments ... -
Large eddy simulation of a turbulent diffusion flame: some aspects of subgrid modelling consistency
Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2017-04-26)
Article
Accés obertIn the context of Large Eddy Simulation (LES) solely for the momentum transport equation there may be found several models for the turbulent subgrid fluxes. Furthermore, among those relying on the eddy diffusivity approach, ... -
Large eddy simulation of a turbulent jet diffusion flame using the Flamelet-Progress Variable model
Ventosa, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2013)
Text en actes de congrés
Accés restringit per política de l'editorialIn this work an hydrogen enriched methane flame in a non-premixed configuration is studied, which corresponds to the DLR flame A. Large Eddy Simulation (LES) will be used to numerically analyse the case. Unstructured meshes ... -
Large-eddy simulation of turbulent dynamic fluid-structure interaction
Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (Begell House, 2012)
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Low Mach Navier-Stokes equations on unstructured meshes
Ventosa Molina, Jordi; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
Text en actes de congrés
Accés restringit per política de l'editorialNumerical methods for fluxes with strong density variations but with speeds much lower than the sound speed, known as low Mach flows, present some particularities with respect to incompressible formulations. Despite ... -
Low-frequency variations in the wake of a circular cylinder at Re = 3900
Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2011)
Comunicació de congrés
Accés obertFlow around cylindrical structures is of relevance for many practical applications. Knowledge of flow-related unsteady loading of such structures is crucial for hydro- and aerodynamic control and design. In order to obtain ... -
Modelization of a molten salt thermal energy storage for concentrated solar power
Vera i Fernández, Jordi; Colomer Rey, Guillem; Sanmartí Perona, Oriol; Pérez Segarra, Carlos David (Scipedia, 2022)
Text en actes de congrés
Accés obertA numerical model for studying a storage tank for concentrated solar power is presented. The model consists of solving the heat equation for the solid part made from ceramic materials, a one-dimensional model for the molten ... -
Modelization of the Low-Mach Navier Stokes equations in unstructured meshes
Chiva Segura, Jorge; Ventosa, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2011)
Comunicació de congrés
Accés restringit per política de l'editorialIn this paper a Low-Mach number approximation of the Navier Stokes Equations in unstructured meshes is presented. Both staggered and collocated formulations for unstructured grids will be used.The aim is to develop a ... -
Modular object-oriented methodology for the resolution of molten salt storage tanks for CSP plants
Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2013-09)
Article
Accés obertTwo-tank molten salt storages are the most widespread thermal energy storage technology within concentrated solar power plants. In spite of this, there are design aspects such as thermal losses control, optimisation of the ...