Sökning: "Synthetic boundary conditions"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden Synthetic boundary conditions.

  1. 1. Computational fluid dynamics for dispersion calculation in urban surroundings

    Författare :Jan Burman; Anna Rutgersson; Sven-Erik Gryning; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CFD; RANS; LES; Toxicological effects; Synthetic boundary conditions; Stable boundary layer.; Meteorologi; Meteorology;

    Sammanfattning : Increased knowledge on dispersion processes in urban environment will enhance the ability in the society to handle events where releases of toxic substances can occur. Also, the ability to increase preparedness at locations where such events potentially can emerge. LÄS MER

  3. 2. Detached Eddy Simulation for Aerospace Applications

    Författare :Gonzalo Montero Villar; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Evolutionary algorithms; Synthetic turbulence; Chorochronic; POD based phase-lag; Sliding grid; Nozzle flow separation; Hybrid RANS LES; Phase-lagged boundary conditions; Stochastic optimization; CFD; LODI;

    Sammanfattning : With the continuous growth in air traffic that we see nowadays, comes an increase in the requirements needed to be satisfied in order to certify an aircraft for operation. These stricter regulations affect aspects such as CO2 emissions, sound pollution and so on, pushing manufacturers to aim for lighter, more efficient, more robust designs. LÄS MER

  4. 3. Design and Detailed Analysis of Turbomachinery Blades using Truncated Domains

    Författare :Gonzalo Montero Villar; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Evolutionary algorithms; Phase-lagged boundary conditions; Sliding grid; LODI; Stochastic optimization; Synthetic turbulence; CFD; Chorochronic;

    Sammanfattning : With the continuous growth in air traffic that we are seeing nowadays comes an increase in the requirements needed to be satisfied by an aircraft for it to be certified to fly. These stricter regulations affect aspects such as CO2 emissions, sound pollution and so on, pushing manufacturers to aim for lighter, more efficient, more robust designs. LÄS MER

  5. 4. EAL's boundary lubrication performance in hydro power plants

    Författare :Jan Ukonsaari; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Sammanfattning : This licentiate thesis concerns the possibility to change mineral based hydraulic fluid to environmentally adapted lubricants (EAL's) in water turbine applications from the point of view of boundary lubrication. A new test rig was designed to meet the conditions for a slow and/or intermittent motion journal bearing. LÄS MER

  7. 5. Approaching a practice for transient CFD simulations of vortex flow meters

    Författare :Olof Penttinen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; laser doppler velocimetry; vortex flow meter model; synthetic inlet boundary condition; circular cylinder in cross-flow; large-eddy simulations;

    Sammanfattning : The usage of Large-Eddy Simulations (LES) in industrial applications makes it possibleto study transient phenomena. The aim of this work is to find a reliable and accurateapproach to transient studies of the internal flow field in a vortex flow meter. LÄS MER