Search for dissertations about: "large eddy simulation"

Showing result 26 - 30 of 172 swedish dissertations containing the words large eddy simulation.

  2. 26. Large Eddy Simulations of Separated Compressible Flows around Wing Sections

    Author : Jörgen Held; Strömningsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulence; subgrid-scale; shock-boundary layer interaction; wing section; transonic; subsonic; compressible; separated; Large eddy simulation; LES; PVM; Mechanical engineering; hydraulics; vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik;

    Abstract : This thesis concerns numerical calculations of compressible separated flows, with and without shocks, around wing sections using Large Eddy Simulations (LES). The considered geometries are the NACA 0012 wing section and the ONERA AT15A wing section. READ MORE

  4. 27. A Study of Mach 0.75 Jets and Their Radiated Sound Using Large-Eddy Simulation

    Author : Niklas Andersson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Jet noise; CAA; LES; Large Eddy Simulation; Computational Aero-Acoustics;

    Abstract : Large-Eddy Simulations (LES) of a compressible nozzle/jet configuration have been carried out. Two jets were simulated, an isothermal jet and a jet with a higher temperature than the surrounding air. The Mach number was in both cases 0.75 and the jet Reynolds number was 50,000. READ MORE

  5. 28. Subgrid-scale modelling for large-eddy simulation including scalar mixing in rotating turbulent shear flows

    Author : Linus Marstorp; Arne Johansson; Lars-Erik Eriksson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; large-eddy simulation; subgrid-scale model; Fluid mechanics; Strömningsmekanik;

    Abstract : The aim of the present study is to develop subgrid-scale models that are relevant for complex flows and combustion. A stochastic model based on a stochastic Smagorinsky constant with adjustable variance and time scale is proposed. READ MORE

  6. 29. Large Eddy Simulation of Cavitating Flow on Hydrofoils

    Author : Nai Xian Lu; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Cavitation is the occurrence of vapour pockets in liquids due to the phenomenon that liquid may turn into vapour when the pressure in the flow is lowered below the vaporization pressure. It often brings negative effects such as performance degradation, noise and vibration, and material damage, therefore becoming one of the limiting factors when designing the propulsion systems. READ MORE

  7. 30. Efficient Large-­eddy Simulation for Wind Energy Applications

    Author : Henrik Asmuth; Stefan Ivanell; Hugo Olivares-Espinosa; Karl Nilsson; Richard Stevens; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Modelling the interaction of wind turbines with the ambient flow is essential for almost all technical aspects of wind energy exploitation. Large-eddy simulation (LES) is the most detailed approach feasible to model this complex interaction of wind turbines with the atmospheric boundary layer and the wakes of upstream turbines. READ MORE