Search for dissertations about: "direct numerical simulation"

Showing result 1 - 5 of 98 swedish dissertations containing the words direct numerical simulation.

  1. 1. Direct numerical simulation of turbulent flow in plane and cylindrical geometries

    University dissertation from Stockholm : Mekanik

    Author : Jukka Komminaho; [2000]
    Keywords : turbulence; plane Couette flow; pipe flow; laminar-turbulent transition; direct numerical simulation; spectral methods;

    Abstract : This thesis deals with numerical simulation of turbulentflows in geometrically simple cases. Both plane and cylindricalgeometries are used. The simplicity of the geometry allows theuse of spectral methods which yield a very high accuracy usingrelatively few grid points. A spectral method for planegeometries is implemented on a parallel computer. READ MORE

  2. 2. Studies of turbulent boundary layer flow throughdirect numerical simulation

    University dissertation from Stockholm : Mekanik

    Author : Martin Skote; [2001]
    Keywords : Turbulence; direct numerical simulation; boundary layer; separation; parallel computers; turbulence modelling;

    Abstract : .... READ MORE

  3. 3. Direct numerical simulation of turbulent premixed flames at high Karlovitz numbers: structure and modelling

    University dissertation from Department of Energy Sciences, Lund University

    Author : Thommie Nilsson; [2019]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Direct numerical simulation; Computational fluid dynamics; Combustion model; Premixed flame; Turbulence; Karlovitz number;

    Abstract : There has been recent increased interest in premixed flames and in particular for use in gas turbines for power generation. This is a development that follows from increasing demands for high efficiency and low emissions of NOx, which can be achieved by using premixed flames and lean pre-heated mixtures, often close to the lean flammability limit. READ MORE

  4. 4. Fundamental studies of non-premixed combustion in turbulent wall jets using direct numerical simulation

    University dissertation from Department of Energy Sciences, Lund University

    Author : Zeinab Pouransari; V. Arne Johansson; Christer Fureby; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; non-premixed combustion; global reaction; direct numerical simulation; wall-jet; heat release; mixing scales; heat transfer; TECHNOLOGY Engineering mechanics Other engineering mechanics; TEKNIKVETENSKAP Teknisk mekanik Övrig teknisk mekanik;

    Abstract : The present thesis deals with the fundamental aspects of turbulent mixingand non-premixed combustion in wall-jet flows. Direct numerical simulations(DNS) of compressible turbulent flows are performed in a wall-jet configura-tion, which has a close resemblance to many industrial combustion applica-tions. READ MORE

  5. 5. Numerical study of flame dynamics

    University dissertation from Umeå : Fysik

    Author : Arkady Petchenko; Vitaly Bychkov; Leonid Kagan; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; combustion; Direct Numerical Simulation DNS ; turbulence; flame-vortex interaction; flame acceleration; flame-acoustic interaction; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : Modern industrial society is based on combustion with ever increasing standards on the efficiency of burning. One of the main combustion characteristics is the burning rate, which is influenced by intrinsic flame instabilities, external turbulence and flame interaction with walls of combustor and sound waves. READ MORE