Ara es mostren els items 70-89 de 151

    • 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 obert
      A 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'editorial
      In 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 obert
      Two-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 ...
    • Modular object-oriented methodology for the resolution of molten salt storage tanks for CSP plants 

      Oliva Llena, Asensio; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Torras Ortiz, Santiago (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
    • Modular simulation of vapour compression systems with an object oriented tool 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The objective of this work is to simulate vapour compression refrigeration systems through a modular approach by means of an object - oriented numerical tool called NEST. For this purpose, the global system is modeled as ...
    • Multi-layered solid-PCM thermocline thermal storage concept for CSP plants. Numerical analysis and perspectives 

      Galione Klot, Pedro Andrés; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Rigola Serrano, Joaquim (2015-03-15)
      Article
      Accés obert
      Thermocline storage concept has been considered for more than a decade as a possible solution to reduce the huge cost of the storage system in concentrated solar power (CSP) plants. However, one of the drawbacks of this ...
    • Multi-layered solid-PCM thermocline thermal storage for CSP. Numerical evaluation of its application in a 50 MWe plant 

      Galione Klot, Pedro Andrés; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Torras Ortiz, Santiago; Rigola Serrano, Joaquim (2015-09-01)
      Article
      Accés obert
      Thermocline storage concept is considered as a possible solution to reduce the cost of thermal storage in concentrated solar power (CSP) plants. Recently, a multi-layered solid-PCM (MLSPCM) concept—consisting of a ...
    • New differential operators and discretization methods for large-eddy simulation and regularization modeling 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Pérez Segarra, Carlos David; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Direct numerical simulations (DNS) of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grain ...
    • New parallel method for adjacent disconnected unstructured 3D meshes 

      Muela Castro, Jordi; Martínez Valdivieso, Daniel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A new parallel method for simulations with non-overlapping disconnected mesh domains but adjacent boundaries is presented and studied. This technique allows simulations using 3D unstructured meshes that are independent.
    • New parallel method for adjacent disconnected unstructured 3D meshes 

      Muela Castro, Jordi; Martínez Valdivieso, Daniel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2016-07-14)
      Article
      Accés obert
      A new parallel method for simulations with non-overlapping disconnected mesh domains but adjacent boundaries is presented and studied. This technique allows simulations using 3D unstructured meshes that are independent.
    • Non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity 

      Kizildag, Deniz; Rodríguez Pérez, Ivette María; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio; Pérez Segarra, Carlos David (Begell House, 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The present work studies the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulation. The obtained results reveal significant NOB effects for this ...
    • Numeric analysis 

      Pérez Segarra, Carlos David; Ortega, Enrique (2009-10-14)
      Audiovisual
      Accés obert
    • Numerical analysis of conservative unstructured discretisations for low Mach flows 

      Ventosa Molina, Jordi; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Muela Castro, Jordi; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2016-12-01)
      Article
      Accés obert
      Unstructured meshes allow easily representing complex geometries and to refine in regions of interest without adding control volumes in unnecessary regions. However, numerical schemes used on unstructured grids have to ...
    • Numerical analysis of no-frost domestic refrigerator evaporators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Rigola Serrano, Joaquim (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The air-to-refrigerant evaporator placed in no-frost refrigerators is a critical component because of its simultaneous treatment of both cooler and freezer air streams, which implies a strong drying process on the cooler ...
    • Numerical analysis of parcel tracking in large eddy simulation of polydispersed multiphase flows: assessment of different parcel modeling techniques 

      Bahramian, Linda; Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In order to assess the impacts of parcel modeling, the Eulerian-Lagrangian method, by using the Particle-In-Cell model, is implemented for a three-dimensional polydispersed two-phase turbulent flow. First, the benchmark ...
    • Numerical analysis of the transpose diffusive term for viscoplastic-type non-Newtonian fluid flows using a collocated variable arrangement 

      Carmona Muñoz, Ángel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015-05-01)
      Article
      Accés obert
      The aim of this work is to delve into the numerical analysis of viscoplastic-type non-Newtonian fluid flows. Specifically, improvements in the spatial discretization schemes and the temporal integration methods have been ...
    • Numerical analysis of the turbulent fluid flow through valves. Geometrical aspects influence at different positions 

      Rigola Serrano, Joaquim; Aljure Osorio, David E.; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015)
      Comunicació de congrés
      Accés obert
      The aim of this paper is to carry out a group of numerical experiments over the fluid flow through a valve reed, using the CFD&HT code TermoFluids, an unstructured and parallel object-oriented CFD code for accurate and ...
    • Numerical analysis of two-phase flow in condensers and evaporators with special emphasis on single-phase/two-phase transition zones 

      Morales Ruíz, Sergio; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; García-Valladares, O (2009-04-01)
      Article
      Accés restringit per política de l'editorial
      A numerical study of the thermal and fluid-dynamic behaviour of the two-phase flow in ducts under condensation or evaporation phenomena is presented. The numerical simulation has been developed by means of the finite volume ...
    • Numerical Analysis of Viscoelastic Fluid Injection Processes 

      Amani, Ahmad; Schillaci, Eugenio; Kizildag, Deniz; Pérez Segarra, Carlos David (2021)
      Text en actes de congrés
      Accés obert
      In this work, a numerical framework aimed at simulating high-viscous and viscoelastic liquid injection processes is presented. The study of fluid injection with viscoelastic properties, such as synthetic polymers, is of ...
    • Numerical assessment of parcel modeling in large eddy simulation for dispersed multiphase flows 

      Bahramian, Linda; Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2023)
      Text en actes de congrés
      Accés obert
      The particle-laden turbulent flow benchmark case of a confined jet by Hishida (1987) was selected for validation purposes of the Eulerian-Lagrangian method in Large Eddy Simulation (LES). After validation, a particle size ...