Exploració per autor "Lehmkuhl Barba, Oriol"Més informació

Ara es mostren els items 195-214 de 229

    • Self-induced large-scale motions in a three-dimensional diffuser 

      Miró Jané, Arnau; Eiximeno Franch, Benet; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol (Springer, 2023-09-14)
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      A direct numerical simulation of a three-dimensional diffuser at Reynolds number Re = 10,000 (based on inlet bulk velocity) has been performed using a low-dissipation finite element code. The geometry chosen for this work ...

    • Simulation of Household Refrigerators with a Flexible Numerical Tool 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (Purdue University, 2014)
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      This work presents a flexible numerical platform to simulate a whole household refrigeration unit taking into account both the refrigeration cycle itself and the refrigerated compartments network. The methodology implemented ...

    • Simulation of the two-fluid model on incompressible flow with Fractional Step method for both resolved and unresolved scale interfaces 

      Hou, Xiaofei; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2015-04)
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      In the present paper, the Fractional Step method usually used in single fluid flow is here extended and applied for the two-fluid model resolution using the finite volume discretization. The use of a projection method ...

    • SOD2D: A GPU-enabled spectral finite elements method for compressible scale-resolving simulations 

      Silva, Lucas Gasparino Ferreira da; Spiga, Filippo; Lehmkuhl Barba, Oriol (2024-04)
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      As new supercomputer architectures become more heavily focused on using hardware accelerators, in particular general-purpose graphical processors, it is therefore relevant that algorithms for computational fluid dynamics, ...

    • Study of stochastic models for subgrid dispersion in Lagrangian-Eulerian formulation 

      Muela Castro, Jordi; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Springer, 2018)
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      Dispersed multiphase turbulent flows are present in many industrial and commercial applications like internal combustion engines, turbofans, dispersion of contaminants, steam turbines, etc. Therefore, there is a clear ...

    • Study of the autoignition of a hydrogen jet in a turbulent co-flow of heated air using LES modelling 

      Muela Castro, Jordi; Ventosa, Jordi; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2013)
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      The autoignition process of a hydrogen jet into a preheated turbulent air stream is numerically studied. A Progress-variable model with the turbulence-chemistry interaction s modelled using a Presumed Conditional Moment ...

    • Study of turbulent natural convection in a tall differentially heated cavity filled with either non-participating, participating grey and participating semigrey media 

      Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Pérez Segarra, Carlos David (Université de Poitiers, 2012)
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      Turbulent natural couvection in a tall differentially heated cavity of aspect ratio 5:1, filled with air under a Rayleigh number based on the height of 4.5.10(10), is studied numerically. Three different situations have ...

    • Subject-variability effects on micron particle deposition in human nasal cavities 

      Calmet, Hadrien; Kleinstreuer, Clement; Houzeaux, Guillaume; Kolanjiyil, Arun Varghese; Lehmkuhl Barba, Oriol; Olivares, Edgar; Vázquez, Mariano (Elsevier, 2018-01)
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      Validated computer simulations of the airflow and particle dynamics in human nasal cavities are important for local, segmental and total deposition predictions of both inhaled toxic and therapeutic particles. Considering ...

    • Symmetry-preserving discretization of Navier-Stokes equations on collocated unstructured meshes 

      Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David; Verstappen, R.W.C.P. (2014-02-01)
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      A fully-conservative discretization is presented in this paper. The same principles followed by Verstappen and Veldman (2003) [3] are generalized for unstructured meshes. Here, a collocated-mesh scheme is preferred over a ...

    • Temperature gradient effects on a turbulent channel flow at Ret=400 

      García Berenguer, Marina; Gasparino, Lucas; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (Begell House, 2023)
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      A direct numerical simulation (DNS) of an asymmetrically heated turbulent channel flow has been performed to study the temperature gradient effects on the turbulence. The case has been set as a compressible flow with ...

    • The ALEX17 diurnal cycles in complex terrain benchmark 

      Sanz Rodrigo, Javier; Santos, Pedro; Chávez Arroyo, R; Avila, Matias; Cavar, Dalibor; Lehmkuhl Barba, Oriol; Owen, Herbert; Li, R; Tromeur, Eric (IOP Publishing, 2021)
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      The NEWA ALEX17 experiment was conducted with the objective of characterizing the wind conditions upstream of the Alaiz Test Site for the validation of flow models. From the intensive operational period, a case study has ...

    • The development of high-order methods for finite elements to study turbulent reacting flow 

      Blanco Casares, Antonio; Mira Martínez, Daniel; Lehmkuhl Barba, Oriol (Barcelona Supercomputing Center, 2022-05)
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      Numerical methods for solving differential equations are the base of any computational simulation. The finite element method (FEM) has emerged as one of the most powerful numerical methods so far devised, mainly because of ...

    • The effects of roughness on the boundary layer development of a circular cylinder 

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Piomelli, Ugo; Chiva Segura, Jorge; Borrell, Ricard; Oliva Llena, Asensio (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2017)
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      This paper focuses on the effects of surface roughness in the flow past a circular cylinder at different Reynolds numbers. Large eddy simulations of the flow, from subcritical to transcritical Reynolds numbers and at ...

    • Thermal optimization of multi-functional façades as energy efficient solution in retrofitting of public buildings 

      Kizildag, Deniz; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Capdevila Paramio, Roser; Oliva Llena, Asensio (International Building Performance Simulation Association (IBPSA), 2016)
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      The present work is on the implementation of a multi-functional ventilated façade model within an existing parallel and object-oriented platform for the prediction of the thermal performance of the buildings. Owing to its ...

    • Thermo-mechanical parametric analysis of packed-bed thermocline energy storage tanks 

      González Acedo, Ignacio; Pérez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Torras Ortiz, Santiago; Oliva Llena, Asensio (2016-10-01)
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      A packed-bed thermocline tank represents a proved cheaper thermal energy storage for concentrated solar power plants compared with the commonly-built two-tank system. However, its implementation has been stopped mainly due ...

    • Three dimensionality in the wake of the flow around a circular cylinder at Reynolds number 5000 

      Aljure Osorio, David E.; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (Elsevier, 2017-04-02)
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      The turbulent flow around a circular cylinder has been investigated at Re=5000Re=5000 using direct numerical simulations. Low frequency behavior, vortex undulation, vortex splitting, vortex dislocations and three dimensional ...

    • Toward the usage of deep learning surrogate models in ground vehicle aerodynamics 

      Eiximeno Franch, Benet; Miró Jané, Arnau; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol (Multidisciplinary Digital Publishing Institute (MDPI), 2024-03-27)
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      This study introduces a deep learning surrogate model designed to predict the evolution of the mean pressure coefficient on the back face of a Windsor body across a range of yaw angles from 2.5◦ to 10◦ . Utilizing a ...

    • Towards a direct numerical simulation of a lifted CH4-air diffusion flame 

      Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Begell House, 2015)
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      The near field jet of a self-igniting methane-air diffusion jet flame is studied by means of Direct Numerical Simulation (DNS) and a Flamelet/Progress-Variable (FPV) model to include detailed chemistry. Hence, all flow and ...

    • Towards a low dissipation FE scheme for scale resolving turbulent compressible flows 

      Silva, Lucas Gasparino F. da; Lehmkuhl Barba, Oriol; Mira Martínez, Daniel (Barcelona Supercomputing Center, 2019-05-07)
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    • Towards a machine learning model for explicit algebraic Reynolds stress modelling using multi-expression programming 

      Miró Jané, Arnau; Wallin, Stefan; Colombo, Alessandro; Temmerman, Lionel; Wunsch, Dirk; Lehmkuhl Barba, Oriol (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
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      A novel framework for a 5-term explicit algebraic Reynolds stress model has been proposed, which is suitable for machine learning procedures. Under this framework, high-fidelity datasets have been explored and post-processed. ...