Sökning: "vortex breakdown"

Visar resultat 1 - 5 av 34 avhandlingar innehållade orden vortex breakdown.

  1. 1. On vortex breakdown in swirling annular jets

    Författare :Carl Fredrik Stein; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; swirling jets; vortex breakdown; conical self-similarity; swirl numbers; CFD; CFD;

    Sammanfattning : .... LÄS MER

  3. 2. Adaptive Mesh Refinement and Simulations of Unsteady Delta-Wing Aerodynamics

    Författare :Yann Le Moigne; KTH; []
    Nyckelord :delta wing; high angle of attack; vortex; pitching; mesh refinement; UCAV; vortex sensor; tensor ofvelocity gradients;

    Sammanfattning : This thesis deals with Computational Fluid Dynamics (CFD)simulations of the flow around delta wings at high angles ofattack. These triangular wings, mainly used in militaryaircraft designs, experience the formation of two vortices ontheir lee-side at large angles of attack. LÄS MER

  4. 3. Large Eddy Simulation of Turbulent Swirling Flows in Combustor Related Geometries

    Författare :Yajing Wu; Strömningsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Swirling flow; swirler; vortex breakdown; precessing vortex core PVC ; large eddy simulation LES .;

    Sammanfattning : This thesis deals with the physics of turbulent swirling flows. Large eddy simulation (LES) method is used to investigate the vortex breakdown process, the precessing vortex core (PVC), and the effect of swirl number and flow field configuration on swirling flows. The study is based on an open source CFD code, \textit{OpenFoam}. LÄS MER

  5. 4. Advances in vortical flow prediction methods for design of delta-winged aircraft

    Författare :Simone Crippa; Arthur Rizzi; James Luckring; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; delta wing; slender wing; aircraft; vortex; VFE-2; CAWAPI; HISAC; Vehicle engineering; Farkostteknik;

    Sammanfattning : This thesis covers the field of vortex-flow dominated external aerodynamics. As part of the contribution to the AVT-113 task group it was possible to prove the feasibility of high Reynolds number CFD computations to resolve and thus better understand the peculiar dual vortex system encountered on the VFE-2 blunt leading edge delta wing at low to moderate incidences. LÄS MER

  7. 5. Analytical and Numerical Studies of Internal Swirling Flows

    Författare :Walter Gyllenram; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulence; vortex; draft tube; hydro turbine; filter; RANS; LES; swirling flow;

    Sammanfattning : Swirling flows are common in technical applications, e.g. turbines, pumps, fans, compressors and combustors. LÄS MER