Ara es mostren els items 77-96 de 151

    • 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
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      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
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      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 ...
    • Numerical assessment of RANS and LES modelling in particle separation devices 

      Bahramian, Linda; Amani, Ahmad; Muela Castro, Jordi; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (European Conference for AeroSpace Sciences (EUCASS), 2022)
      Text en actes de congrés
      Accés obert
      In the present work, the separation efficiency analysis on particle-laden flows in the framework of LES and RANS modelling for an Inertial Particle Separator (IPS) device has been presented. The comparison of LES and RANS ...
    • Numerical dynamic analysis of reciprocating compressor mechanism. Parametric studies for optimization purposes 

      Pont Vilchez, Arnau; López Mas, Joan; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2017-01)
      Article
      Accés obert
      A complete numerical dynamic analysis of reciprocating compressor mechanism is presented, coupling the instantaneous pressure in the compression chamber, the electric motor torque and the hydrodynamic reactions, which arise ...
    • Numerical evaluation of multi-layered solid-PCM thermocline-like tanks as thermal energy storage systems for CSP applications 

      Galione Klot, Pedro Andrés; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Torras Ortiz, Santiago; Rigola Serrano, Joaquim (2015-05)
      Article
      Accés obert
      The two-tank system is the technology used for thermal energy storage (TES) in current concentrating solar power (CSP) plants. Thermocline storage concept has been considered for more than a decade as a possible solution ...
    • Numerical Model of Capillary Tubes: Enhanced Performance and Study of Non-Adiabatic Effects 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Purdue University, 2014)
      Text en actes de congrés
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      In the present work a numerical model to simulate the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes is presented. It consists of an improved version of the distributed model detailed in Ablanque ...
    • Numerical modeling of simultaneous heat and moisture transfer under complex geometry for refrigeration purposes 

      Hou, Xiaofei; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (Université de Poitiers, 2012)
      Text en actes de congrés
      Accés obert
      The aim of the paper is to gain a better insight into heat and moisture transfer in refrigerator and to do fundamental study for water evaporation and condensation in refrigeration application. The governing transport ...
    • Numerical modelling of the phase change material heat accumulator under fast transient gasification conditions in a low thrust cryogenic propulsion (LTCP) system 

      Castro González, Jesús; Galione Klot, Pedro Andrés; Morales Ruiz, Juan José; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
      Report de recerca
      Accés restringit per política de l'editorial
      The study of one of the components, the heat accumulator, of Low Thrust Cryogenic Propulsion systems (LTCP), is of scientific interest in the framework of ISP-1 project [1]. This device stores thermal energy from the fuel ...
    • Numerical resolution of the heat accumulator in a Low Cost Cryogenic Propulsion (LCCP) system 

      Morales Ruíz, Sergio; Castro González, Jesús; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés obert
      In this paper, a numerical study of a heat accumulator in the LCCP system has been carried out. The thermal and fluid-dynamic behaviour of the two-phase flow inside ducts working under cryogenic conditions as a propellant ...