Search for dissertations about: "unsteady CFD"

Showing result 1 - 5 of 48 swedish dissertations containing the words unsteady CFD.

  1. 1. Realistic simulations of delta wing aerodynamics using novel CFD methods

    University dissertation from Stockholm : KTH

    Author : Stefan Görtz; KTH.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; CFD; aerodynamics; flow physics; steady; unsteady; delta wing; vortical flow; Rymd- och plasmafysik; NATURAL SCIENCES Physics Geocosmophysics and plasma physics Space physics; NATURVETENSKAP Fysik Geokosmofysik och plasmafysik Rymdfysik;

    Abstract : The overall goal of the research presented in this thesis is to extend the physical understanding of the unsteady external aerodynamics associated with highly maneuverable delta-wing aircraft by using and developing novel, more efficient computational fluid dynamics (CFD) tools. More specific, the main purpose is to simulate and better understand the basic fluid phenomena, such as vortex breakdown, that limit the performance of delta-wing aircraft. READ MORE

  2. 2. Accurate physical and numerical modeling of complex vortex phenomena over delta wings

    University dissertation from Stockholm : KTH

    Author : Simone Crippa; KTH.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; computational fluid dynamics; CFD; vortical flow; delta wing; aerodynamics; flow physics; steady; unsteady; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Abstract : With this contribution to the AVT-113/VFE-2 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. Initial investigations into this phenomenon seemed to undermine the hypothesis, that the formation of the inner vortex system relies on the laminar state of the boundary layer at separation onset. READ MORE

  3. 3. Numerical Investigation of Aerodynamic Blade Excitation Mechanisms in Transonic Turbine Stages

    University dissertation from Stockholm : Energiteknik

    Author : Björn Laumert; KTH.; [2002]
    Keywords : Transonic Turbines; CFD; Forced Response; Unsteady Aerodynamics;

    Abstract : With the present drive in turbomachine engine developmenttowards thinner and lighter bladings, closer spaced blade rowsand higher aerodynamic loads per blade row and blade, advanceddesign criteria and accurate prediction methods for vibrationalproblems such as forced response become increasingly importantin order to be able to address and avoid fatigue failures ofthe machine early in the design process. The present worksupports both the search for applicable design criteria and thedevelopment of advanced prediction methods for forced responsein transonic turbine stages. READ MORE

  4. 4. CFD Modeling of Combustion in Flexi-Fuel Burners at Gas Turbine Conditions

    University dissertation from Stockholm : Energiteknik

    Author : Abdallah Abou-Taouk; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAS-SST; Global reaction mechanism; CFD; LES; RANS; Combustion; PSR; Chemistry;

    Abstract : The main source of energy in the nearest future will come from fossil fuels. Increasing demands on environmentally friendly energy conversion implies that pollutants, such as CO and NOx, need to be reduced. READ MORE

  5. 5. Analytical and Numerical Investigations of Steady and Unsteady Turbulent Swirling Flow in Diffusers

    University dissertation from Stockholm : Energiteknik

    Author : Walter Gyllenram; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; draft tube; diffuser; LES; vortex breakdown; turbulence; CFD; swirling flow;

    Abstract : Swirling flows are found in many technical applications, e.g. turbines, pumps, fans, compressors and combustors. The objective of the present work is to acquire an understanding of the physics of swirling flow in general and unsteady swirling flow in draft tubes of water turbines in particular. READ MORE