Search for dissertations about: "Reynolds Average Navier-Stokes RANS"

Found 5 swedish dissertations containing the words Reynolds Average Navier-Stokes RANS.

  1. 1. Methodologies for RANS-LES interfaces in turbulence-resolving simulations

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Sebastian Arvidson; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; zonal RANS-LES; aeronautics; RANS-LES interfaces; Hybrid RANS-LES; grey-area mitigation; log-layer mismatch; embedded LES; LES length scale; LES;

    Abstract : Hybrid Reynolds-Average Navier-Stokes (RANS)-Large-Eddy Simulations (LES) techniques are now seen by the aeronautical industry as the most promising turbulence-resolving approaches for complex high-Reynolds-number turbulent flows with regard to cost and accuracy. However, connecting RANS and LES simulated flows is a challenging task and needs special attention in order to increase simulation robustness and accuracy. READ MORE

  2. 2. A body force method for high precision offshore wake modelling simulations

    University dissertation from Uppsala : Uppsala universitet

    Author : Nikolaos Simisiroglou; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind power; Offshore wind farm; Wakes; Actuator disc method ACD ; Computational fluid dynamics CFD ; Reynolds Average Navier-Stokes RANS ; WindSim; PHOENICS;

    Abstract : .... READ MORE

  3. 3. Numerical Investigation of Unsteady Crosswind Aerodynamics for Ground Vehicles

    University dissertation from Uppsala : Uppsala universitet

    Author : Tristan Favre; Gunilla Efraimsson; Mattias Chevalier; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aerodynamics; Vehicle Aerodynamics; Unsteady Aerodynamics; Crosswind; Unsteady Crosswind Aerodynamics; Detached-Eddy Simulations; DES; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Abstract : Ground vehicles are subjected to crosswind from various origins such as weather, topography of the ambient environment (land, forest, tunnels, high bushes...) or surrounding traffic. READ MORE

  4. 4. CFD Simulations for Film Cooling Reduced Models at Engine Like Conditions

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Andreas Bradley; Matts Karlsson; Karl Storck; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : In gas turbines some parts are exposed to combustion gases with temperatures well above the melting temperature of the material. Therefore, various cooling techniques are utilized in order to protect the parts exposed to these hot gases. One such technique, film cooling, is a common and well established way to protect the exposed parts. READ MORE

  5. 5. Large Eddy Simulation of Turbulent Flow and Combustion in HCCI Engines

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Rixin Yu; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulent combustion; Numerical methods.; LES; Temperature inhomogeneity; HCCI combustion; In-cylinder flow;

    Abstract : This thesis deals with numerical simulations of the turbulent combustion process in Homogeneous Charge Compression Ignition (HCCI) engines. An accurate and computationally efficient Large Eddy Simulation (LES) model was developed and used throughout this thesis to investigate the development of in-cylinder turbulence, temperature stratification, onset of auto-ignition, and development of the reaction fronts. READ MORE