Sökning: "LOW-REYNOLDS-NUMBER"

Visar resultat 1 - 5 av 24 avhandlingar innehållade ordet LOW-REYNOLDS-NUMBER.

  1. 1. Turbulence Modelling of Flows Related to Wall-Cooling Applications

    Detta är en avhandling från Chalmers University of Technology

    Författare :Stefan Jansson; Chalmers tekniska högskola.; Chalmers University of Technology.; [1994]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fysik; Physics; Teknisk mekanik; Engineering mechanics; turbulence modelling; second-order-moment closures; two-equation models; turbulent heat transfer; film-cooling; low-Reynolds number models; near-wall models;

    Sammanfattning : Engineering flows are generally characterised by complex strain field and turbulence structure arising from a combination of shear, curvature, separation and recirculation etc. Under such flow conditions, transport by turbulent velocity fluctuations can make a significant contribution to the transport of momentum, heat and mass. LÄS MER

  2. 2. Near-Field Study of Multiple Interacting Jets Confluent Jets

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Shahriar Ghahremanian; Högskolan i Gävle.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiple interacting jets; confluent jets; axisymmetric round jet; Low Reynolds number jet; Particle Image Velocimetry PIV ; Laser Doppler Anemometry LDA ; Hot-Wire anemometry HWA ; RANS turbulence models; SST −; Low Reynolds −; Response Surface Method;

    Sammanfattning : This thesis deals with the near-field of confluent jets, which can be of interest in many engineering applications such as design of a ventilation supply device. The physical effect of interaction between multiple closely spaced jets is studied using experimental and numerical methods. LÄS MER

  3. 3. Numerical investigation of swimming micro-organisms in complex environments

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Lailai Zhu; KTH.; KTH.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrodynamic interaction; swimming microorganisms; Low-Reynolds number swimming; stokes flow; squirmer; finite element method; boundary element method; viscoelastic fluid; polymeric flow; microrheology;

    Sammanfattning : .... LÄS MER

  4. 4. Robust Numerical Wall Functions Implemented in OpenFOAM

    Detta är en avhandling från Chalmers University of Technology

    Författare :Jon-Anders Bäckar; Chalmers tekniska högskola.; Chalmers University of Technology.; [2016]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computational Fluid Dynamics; OpenFOAM; impinging jet; numerical wall function; speed-up;

    Sammanfattning : This thesis presents two new numerical wall models for computing Reynolds-Averaged- Navier-Stokes (RANS) equations with low-Reynolds-number turbulence models. The objective is to considerably reduce the total central processing unit (CPU) cost of the numerical simulations of wall bounded flows while maintaining the accuracy of any low-Reynolds-number turbulence model. LÄS MER

  5. 5. Control and estimation of wall bounded flow systems

    Detta är en avhandling från Stockholm : Mekanik

    Författare :Jerome Hoepffner; KTH.; [2004]
    Nyckelord :;

    Sammanfattning : This thesis focuses on the application of linear feedback control and estimation to channel flow. Both the initial stage of the transition and the low Reynolds number turbulent cases are studied. From sensors at the wall, the state of the flow is estimated, using a stochastic description of the flow disturbances. LÄS MER