Exploració per autor "Ventosa Molina, Jordi"
Ara es mostren els items 1-18 de 18
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A dynamic load balancing method for the evaluation of chemical reaction rates in parallel combustion simulations
Muela Castro, Jordi; Borrell Pol, Ricard; Ventosa Molina, Jordi; Jofre Roca, Lluís; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (Elsevier, 2019-08-15)
Article
Accés obertThe development and assessment of an efficient parallelization method for the evaluation of reaction rates in combustion simulations is presented. Combustion simulations where the finite-rate chemistry model is employed ... -
Analysis of the Near-Wall Flow in a Turbine Cascade by Splat Visualization
Nsonga, Baldwin; Scheuermann, Gerik; Gumhold, Stefan; Ventosa Molina, Jordi; Koschichow, Denis; Fröhlich, Jochen (2020-01)
Article
Accés obertTurbines are essential components of jet planes and power plants. Therefore, their efficiency and service life are of central engineering interest. In the case of jet planes or thermal power plants, the heating of the ... -
Artificial compressibility method for high-pressure transcritical fluids at low Mach numbers
Abdellatif, Ahmed Mohammed Abdelfattah; Ventosa Molina, Jordi; Grau Barceló, Joan; Torres Cámara, Ricardo; Jofre Cruanyes, Lluís (Elsevier, 2024-02-15)
Article
Accés obertSupercritical fluids possess unique properties that makes them relevant in various scientific and engineering applications. However, the experimental investigation of these fluids is challenging due to the high pressures ... -
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)
Text en actes de congrés
Accés restringit per política de l'editorialAccurate 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, ... -
Effects of Rotation on the Flow Structure in a Compressor Cascade
Ventosa Molina, Jordi; Koppe, Björn; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (2022-08-01)
Article
Accés restringit per política de l'editorialIn turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance ... -
Effects of Rotation on the Flow Structure in a Compressor Cascade
Ventosa Molina, Jordi; Koppe, Björn; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (American Society of Mechanical Engineers (ASME), 2021)
Text en actes de congrés
Accés restringit per política de l'editorialIn turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance ... -
Exploring the artificial compressibility method in high-pressure transcritical fluids
Abdellatif, Ahmed Mohammed Abdelfattah; Ventosa Molina, Jordi; Grau Barceló, Joan; Torres Cámara, Ricardo; Jofre Cruanyes, Lluís (International Centre for Numerical Methods in Engineering (CIMNE), 2023)
Text en actes de congrés
Accés obertThis work presents the investigation of a solution to accelerate computations of high-pressure transcritical fluids at low-Mach number regimes based on the artificial compressibility method. The highly adaptable nature of ... -
Intermediate wake characteristics behind a circular cylinder
Ventosa Molina, Jordi; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Fröhlich, Jochen (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertThe intermediate wake of a circular cylinder at Reynolds number 3300 is studied by means of highly resolved large eddy simulations. The domain spans 100 cylinder diameters D downstream of the cylinder. The intermediate ... -
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 hydrogen autoignition in a preheated turbulent co-flow
Muela Castro, Jordi; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Ventosa Molina, Jordi (2013)
Text en actes de congrés
Accés restringit per política de l'editorialThe autoignition process of a hydrogen jet into a preheated turbulent air stream is numerically studied. A Progress-variable (PV) model with the turbulence-chemistry interactions modelled using a Presumed Conditional Moment ... -
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 ... -
Near-Wall Flow in Turbomachinery Cascades—Results of a German Collaborative Project
Engelmann, David; Sinkwitz, Martin; di Mare, Francesca; Koppe, Björn; Mailach, Ronald; Ventosa Molina, Jordi; Fröhlich, Jochen; Schubert, Tobias; Niehuis, Reinhard (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-08)
Article
Accés obertThis article provides a summarizing account of the results obtained in the current collabora-tive work of four research institutes concerning near-wall flow in turbomachinery. Specific questions regarding the influences ... -
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 obertUnstructured 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 simulation of turbulent diffusion flames using flamelet models on unstructured meshes
Ventosa Molina, Jordi (Universitat Politècnica de Catalunya, 2015-10-02)
Tesi
Accés obertThe present thesis aims at developing numerical methods and algorithms for the efficient simulation of diffusion flames in the flamelet regime. To tackle turbulent chemically reacting flows a double framework is used in ... -
Study of Relative Endwall Motion Effects in a Compressor Cascade Through Direct Numerical Simulations
Ventosa Molina, Jordi; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (2021-01-01)
Article
Accés restringit per política de l'editorialLinear cascades are commonly used as surrogate geometries when performing fundamental studies of turbomachinery blading. Several effects are not accounted for in linear cascades, such as the relative motion between blade ... -
Study of Relative Endwall Motion Effects in a Compressor Cascade Through Direct Numerical Simulations
Ventosa Molina, Jordi; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (American Society of Mechanical Engineers (ASME), 2020)
Text en actes de congrés
Accés restringit per política de l'editorialLinear cascades are commonly used as surrogate geometries when performing fundamental studies of turbomachinery blading. Several effects are not accounted for in linear cascades, among them the relative motion between blade ... -
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)
Text en actes de congrés
Accés restringit per política de l'editorialThe 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 ... -
Visual analysis of the impact of periodic wakes on the pressure side of a turbine blade
Nsonga, Baldwin; Ventosa Molina, Jordi; Koschichow, Denis; Fröhlich, Jochen; Gumhold, Stefan; Scheuermann, Gerik (2023-06-01)
Article
Accés obertTurbines are core components in jet engines for flight propulsion, power plants, and other important energy conversion processes. They are composed of successive rows of blades so that wakes of upstream blades reach ...