Sökning: "turbulence modeling"

Visar resultat 1 - 5 av 107 avhandlingar innehållade orden turbulence modeling.

  1. 1. Modeling of magnetohydrodynamic turbulence

    Detta är en avhandling från Stockholm : Mekanik

    Författare :Ola Widlund; [2000]
    Nyckelord :turbulence model; magnetohydrodynamic; mhd; magnetohydrodynamic turbulence; computational fluid dynamics; continuous casting;

    Sammanfattning : Conventional one-point turbulence closures have beenextended with an additional transported scalar for modeling ofmagnetohydrodynamic (MHD) turbulence. The new scalar, α ,captures the length scale anisotropy and tendency towardstwo-dimensionality, which is characteristic feature of MHDturbulence, and allows accurate modeling of the Jouledissipation of turbulence. LÄS MER

  2. 2. On the Arctic Boundary Layer From Turbulence to Climate

    Detta är en avhandling från Stockholm : Meteorologiska institutionen (MISU)

    Författare :Thorsten Mauritsen; Gunilla Svensson; Joao Teixeira; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atmospheric boundary layers; Turbulence; Stable stratification; Gravity waves; Mesoscale motion; Arctic climate; NATURAL SCIENCES Earth sciences Atmosphere and hydrosphere sciences Meteorology; NATURVETENSKAP Geovetenskap Atmosfärs- och hydrosfärsvetenskap Meteorologi; atmosfärvetenskap; Atmospheric Sciences;

    Sammanfattning : The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. LÄS MER

  3. 3. Time-accurate Turbulence Modeling of Swirling Flow for Hydropower Application

    Detta är en avhandling från Stockholm : Meteorologiska institutionen (MISU)

    Författare :Ardalan Javadi; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hybrid RANS-LES; Swirling Flow; DES; Vortex Breakdown; Turbulence Modeling; Hydropower; LES;

    Sammanfattning : Hydraulic turbomachines have played a prominent role in the procurement of renewableenergy for more than a century. Embedded in the context of general technological progress,their design for efficiency and reliability has reached an outstanding level of quality. LÄS MER

  4. 4. Turbulence modeling using automated code generation applied to asymmetric diffuser flow

    Detta är en avhandling från Stockholm : Mekanik

    Författare :Johan Gullman-Strand; [2002]
    Nyckelord :Fluid mechanics; Turbulence modeling; Explicit algebraic Reynolds stress model; Low-Re K-w; Automated code generation; Wall distance function;

    Sammanfattning : .... LÄS MER

  5. 5. Computational Modeling of Complex Flows

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Johan Hoffman; Göteborgs universitet.; Gothenburg University.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; computational fluid dynamics; adaptive finite element method; a posteriori error estimate; subgrid modeling; transition to turbulence; multiresolution analysis; object-oriented software; transition to turbulence; multiresolution analysis; object-oriented software; a posteriori error estimate; adaptive finite element method; subgrid modeling;

    Sammanfattning : In this thesis we consider the following aspects of computational modeling of complex flows: (i) subgrid modeling, (ii) stability, (iii) a posteriori error estimation, and (iv) computational platform. We develop a framework for adaptivity and error control for multiscale problems, in particular for turbulent flow, based on a posteriori error estimates. LÄS MER