Sökning: "unsteady channel flow"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden unsteady channel flow.

  1. 1. Large Eddy Simulation of Turbulent Compressible Jets

    Författare :Bernhard Semlitsch; Mihai Mihaescu; Laszlo Fuchs; Paul G. Tucker; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compressible Flow; Large Eddy Simulation; Acoustic Noise Generation; Near-field Acoustics; Flow Control; Optimization; Modal Flow Decomposition; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : Acoustic noise pollution is an environmental aggressor in everyday life. Aero- dynamically generated noise annoys and was linked with health issues. It may be caused by high-speed turbulent free flows (e.g. LÄS MER

  3. 2. Numerical and Experimental study of shock boundary layer interaction in unsteady transonic flow

    Författare :Olivier Bron; KTH; []
    Nyckelord :Shock Boundary Layer Interaction; Shock Motion; Unsteady Flows; Nozzle Flows; Potential Interaction; Back Pressure Perturbations;

    Sammanfattning : A prerequisite for aeroelastic stability prediction inturbomachines is the understanding of the fluctuatingaerodynamic forces acting on the blades. Unsteady transonicflows are complex because of mutual interactions betweentravelling pressure waves, outlet disturbances, shock motion,and fluctuating turbulent boundary layers. LÄS MER

  4. 3. Flow Maldistribution in Exhaust Aftertreatment Systems - Numerical Simulations

    Författare :Pratheeba Chanda Nagarajan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Catalyst; Flow maldistribution; Transient; CFD Simulations; Reactive flows; Uniformity Index; Exhaust AfterTreatment Systems;

    Sammanfattning : To comply with the stringent emission norms under every driving condition, including the coldstart conditions and Real Driving Emissions (RDE) tests, accurate models that capture the spatial and temporal variation of flow distribution information in Exhaust AfterTreatment Systems (EATS) are required. This study is aimed at characterizing and quantifying flow distribution in EATS under transient conditions with realistic geometry that illustrates the complex nature of the flow conditions. LÄS MER

  5. 4. On Dynamic Behaviour of Wind Systems for Pipe Organs

    Författare :Tobias Carlsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; wind system; pipe organ; wind supply; unsteady channel flow;

    Sammanfattning : The wind system sets the operational conditions for the organ pipes. The pipe foot pressure is by nature very unsteady and is a result of the wind system response to the activities of the organ player. Changing flows create propagating pressure waves. LÄS MER

  7. 5. Mathematical Analysis of Forced Convective Flow Due to Stretching Sheet and Instabilities of Natural Convective Flow

    Författare :Prashant G Metri; Sergei Silvestrov; Rebei Bel-Fdhila; Mälardalens högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Boundary layer theory; Heat and Mass transfer; Partial differential equations; Stretching sheet; Mathematics Applied Mathematics; matematik tillämpad matematik;

    Sammanfattning : The investigations presented in the thesis are theoretical studies of magnetohydrodynamic flows, heat and mass transfer in Newtonian/non-Newtonian cooling liquids, due to horizontal/vertical stretching sheet. The theoretical studies include the effect of magnetic field, uniform and non-uniform heat source/sink (flow and temperature dependent heat source/sink) effects. LÄS MER