Sökning: "potential flows"

Visar resultat 1 - 5 av 190 avhandlingar innehållade orden potential flows.

  1. 1. Disentangling Trade Flows Firms, Geography and Technology

    Detta är en avhandling från Jönköping : Internationella Handelshögskolan

    Författare :Martin Andersson; Högskolan i Jönköping.; [2007]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SOCIAL SCIENCES Business and economics Economics; SAMHÄLLSVETENSKAP Ekonomi Nationalekonomi;

    Sammanfattning : This thesis consists of three individual studies and a common introduction. Albeit distinct and self-contained, all studies are devoted to how and why trade flows adjust according to characteristics of markets and attributes of links between markets. LÄS MER

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

    Detta är en avhandling från Stockholm : Energiteknik

    Författare :Olivier Bron; KTH.; [2003]
    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

  3. 3. Analytical Aerodynamic Simulation Tools for Vertical Axis Wind Turbines

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Paul Deglaire; Uppsala universitet.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vertical axis turbine; vortex flows; conformal mapping; analytical aerodynamics; potential flows; fast multipole methods; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik; Engineering Science; Teknisk fysik;

    Sammanfattning : Wind power is a renewable energy source that is today the fastest growing solution to reduce CO2 emissions in the electric energy mix. Upwind horizontal axis wind turbine with three blades has been the preferred technical choice for more than two decades. This horizontal axis concept is today widely leading the market. LÄS MER

  4. 4. Potential Flow Panel Methods for the Calculation of Free-surface Flows with Lift

    Detta är en avhandling från Chalmers University of Technology

    Författare :Carl-Erik Janson; Chalmers tekniska högskola.; Chalmers University of Technology.; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk mekanik; Engineering mechanics; analytical method; boundary layer; CFD; collocation point shift; damping; Dawson operator; desingularized; dipole; discrete Fourier transform; dispersion; four point operator; free surface; hydrofoil; induced drag; lift force; Method of Moving Asymptotes; MMA; Navier-Stokes; nonlinear; numerical method; OCTOPUS; potential flow; raised panel method; Rankine source; sailing yacht; shape optimization; surface piercing wing; SHIPFLOW; vortex; waves;

    Sammanfattning : Two non-linear Rankine-source panel methods are developed and implemented in the same computer code. The first method uses a four-point upwind operator on the free-surface to compute the velocity derivatives and to enforce the radiation condition while the second method uses an analytical expression for the velocity derivatives and a collocation point shift one panel upstream to prevent upstream waves. LÄS MER

  5. 5. Beyond IT and Productivity Effects of Digitized Information Flows in Grocery Distribution

    Detta är en avhandling från Institutionen för datavetenskap

    Författare :Åsa Horzella; Linköpings universitet.; Linköpings universitet.; [2005]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; IT; Productivity Paradox; Effects; Information Flows; Grocery Distribution; Supply Chain; SOCIAL SCIENCES Business and economics; SAMHÄLLSVETENSKAP Ekonomi; Economic Information Systems; Ekonomiska informationssystem;

    Sammanfattning : During the last decades organizations have made large investments in Information Technology (IT). The effects of these investments have been studied in business and academic communities over the years. A large amount of research has been conducted on the relation between the investments in IT and productivity growth. LÄS MER