Browsing by Author "Lehmkuhl Barba, Oriol"

A coupled volumeoffluid/levelset method for simulation of twophase flows in unstructured meshes
Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Jofre Cruanyes, Lluís; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 201601)
Article
Restricted access  publisher's policyThis paper presents a methodology for simulation of twophase flows with surface tension in the framework of unstructured meshes, which combines volumeoffluid with levelset methods. While the volumeoffluid transport ... 
A filtered kinetic energy preserving finite volumes scheme for compressible flows
Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
Conference report
Open AccessThe Kinetic Energy Preserving Scheme (KEP) for compressible flows has been shown to solve 1D shock waves without smearing them. The method does not add numerical diffusion to solutions but, as a counterpart, it needs ... 
A finitevolume/levelset method for simulating twophase flows on unstructured grids
Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Rigola Serrano, Joaquim (201409)
Article
Restricted access  publisher's policyThe conservative levelset method for capturing the interface between two fluids is combined with a variable density projection scheme to simulate incompressible twophase flows on unstructured meshes. All equations are ... 
A multiple marker levelset method for simulation of deformable fluid particles
Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio (20150901)
Article
Restricted access  publisher's policyA novel multiple marker levelset method is introduced for Direct Numerical Simulation of deformable fluid particles (bubbles and droplets), which is integrated in a finitevolume framework on collocated unstructured grids. ... 
A parallel threedimensional radial basis function interpolation method for unstructured dynamic meshes
Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (2011)
Conference lecture
Open AccessA radial basis function (RBF) interpolation method is implemented to be applied in computational fluid dynamics (CFD) problems with dynamic meshes. It is compared with the classic springs analogy smoothing, focusing on the ... 
A PLICVOF implementation on parallel 3D unstructured meshes
Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (2010)
Conference lecture
Restricted access  publisher's policyThe numerical simulation of interfacial and free surface ows is a vast and interesting topic in the areas of engineering and fundamental physics, such as the study of liquidgas interfaces, formation of droplets, bubbles ... 
A selfadaptive strategy for the time integration of navierstokes equations
Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol (201108)
Article
Restricted access  publisher's policyAn efficient selfadaptive strategy for the explicit time integration of NavierStokes equations is presented. Unlike the conventional explicit integration schemes, it is not based on a standard CFL condition. Instead, the ... 
Assessment of the symmetrypreserving regularization model on complex flows using unstructured grids
Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David; Oliva Llena, Asensio (20120515)
Article
Restricted access  publisher's policyThe main objective of the present paper is the assessment of symmetrypreserving regularization models on unstructured meshes. Three different test cases have been studied: the impinging jet flow, the flow past a circular ... 
CFD simulation of the thermal behavior of a wind mill power generator nacelle
Colomer Rey, Guillem; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2009)
Conference lecture
Restricted access  publisher's policyIn this work we use the Large Eddy Simulation model to predict the thermal behavior of the air inside of a wind generator nacelle, where several elements with di erent thermal characteristics are found. Outside air enters ... 
Combined heat and moisture transfer in buildings systems
Damle, Rashmin; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2012)
Conference report
Restricted access  publisher's policyTemperature and humidity are the two main parameters indicating the comfort level of the building occupants. Although the effect of temperature is taken into account in thermal simulation of buildings, the moisture transfer ... 
Comparative study of subfilter scalar dissipation rate and mixture fraction variance models
Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Muela Castro, Jordi; Oliva Llena, Asensio (2014)
Conference report
Restricted access  publisher's policyAccurate characterisation of mixing at the subfilter level is a critical aspect in many LES combustion models, such as flamelet based and Conditional Moment Closure models. Several models can be found in the literature, ... 
Detailed numerical model for the resolution of molten salt storage tanks for CSP plants
Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Torras Ortíz, Santiago; Lehmkuhl Barba, Oriol (2012)
Conference report
Open AccessConsidering the stateoftheart in TES technologies, twotank indirect system using molten salt is the most widespread within CSP plants. However, current techniques for design and optimization, as well as, for assessing ... 
Detailed numerical study of turbulent flows in air curtains
Jaramillo Ibarra, Julian Ernesto; Pérez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2010)
Conference lecture
Restricted access  publisher's policyAir curtains are generally a set of vertical or horizontal plane jets used as ambient separator. In order to prevent entrainment, a good air curtain should provide a jet with low turbulence level, enough momentum to ... 
Direct numerical simulation and LargeEddy simulations of the turbulent flow around a NACA0012 airfoil
Lehmkuhl Barba, Oriol; Baez Vidal, Aleix; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David (2011)
Conference report
Open AccessThis paper investigates the capabilities of two subgridscale (SGS) models for predicting the complex flow in transitional separated bubbles. We consider here the flow over a NACA 0012 airfoil at Reynolds number Re = 5×10 ... 
Direct numerical simulation of a NACA0012 in full stall
Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (20131015)
Article
Open AccessThis work aims at investigating the mechanisms of separation and the transition to turbulence in the separated shearlayer of aerodynamic profiles, while at the same time to gain insight into coherent structures formed ... 
Direct Numerical Simulation of the flow over a sphere at Re = 3700
Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2009)
Conference lecture
Restricted access  publisher's policyThe direct numerical simulation of the flow past a sphere at Re=3700 is presented. The computations are carried out with a parallel unstructured symmetry preserving information for accurate solving complex geometries. As ... 
Direct numerical simulation of the flow over a sphere at Re = 3700
Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (20110519)
Article
Restricted access  publisher's policyThe direct numerical simulation of the flow over a sphere is performed. The computations are carried out in the subcritical regime at Re = 3700 (based on the freestream velocity and the sphere diameter). A parallel ... 
Direct numerical simulation of the flow over a spherical bubble in a turbulent pipe flow
Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Castro González, Jesús (International Association for Computational Mechanics (IACM), 2014)
Conference report
Restricted access  publisher's policyThis work aims at investigating, by means of a direct numerical simulation, the flow over a clean spherical bubble fixed on the axis of a turbulent pipe flow. The simulation is performed by means of a parallel unstructured ... 
Direct Numerical Simulation of the turbulent flow around a NACA 0012 airfoil at different angles of attack
Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David (2011)
Conference report
Open AccessDirect numerical simulations (DNS) of the flow dynamics over a NACA 0012 airfoil at Reynolds number Re = 5×104 at different angles of attack are presented. The dynamic of the large separation bubble, characterised by laminar ... 
Direct numerical simulation of turbulent wakes: flow past a sphere at Re=5000
Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2010)
Conference report
Open AccessThe flow around bluff bodies is of great interest for a large number of engineering applications such as vehicle aerodynamics, cooling devices using forced convection, heat transfer enhancement using droplets, among ...