Sökning: "Stokes equations"

Visar resultat 1 - 5 av 66 uppsatser innehållade orden Stokes equations.

  1. 1. An overlapping mesh based splitting method for the incompressible Navier-Stokes equations

    Master-uppsats, Umeå universitet/Institutionen för fysik

    Författare :Karl-Johan Lundström; [2020]
    Nyckelord :;

    Sammanfattning : We present an overlapping mesh based splitting method for solving the incompressible Navier-Stokes equations on unfitted mesh settings. The developed method is based on Nitsche’s method for weakly imposing the interface condition between the overlapping meshes, and it uses a ghost penalty approach for stabilizing the cut elements produced by the mesh intersection. LÄS MER

  2. 2. Steady ideal flows with vorticity in toroidal domains and periodic cylinders

    Master-uppsats, Lunds universitet/Matematik LTH; Lunds universitet/Matematik (naturvetenskapliga fakulteten)

    Författare :Gustav Jillbratt; [2020]
    Nyckelord :Partial differential equations; Euler equation; Vorticity; Fluid dynamics; Mathematics and Statistics;

    Sammanfattning : In a paper from 1970, Lortz constructs rotational solutions to the steady Euler equation in toroidal domains using a fixed point method. We shall review this method and rewrite it using Banach's fixed point theorem. LÄS MER

  3. 3. Numerical Study on Hydrodynamic Characteristics of Flood Discharge Tunnel in Zipingpu Water Conservancy Project : Using RANS equations and the VOF model

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära; Uppsala universitet/Elektricitetslära

    Författare :Micaela Hamberg; Signe Dahlin; [2019]
    Nyckelord :VOF; RANS; Navier-Stokes; Spillway; Discharge tunnel; ANSYS; Fluent; CFD; Grid convergence index; Design of spillway; Cavitation; Gambit; k-epsilon; Ansys Gambit;

    Sammanfattning : To avoid the large amount of damage that floods can cause, spillway tunnels are used to control water levels. To ensure the safety of water transportation through spillway tunnels, the behaviour of the water throughout the tunnel is important to know. LÄS MER

  4. 4. Simulation of Colorless Distributed Combustion

    Master-uppsats, Lunds universitet/Institutionen för Energivetenskaper

    Författare :Hampus Olsson; [2019]
    Nyckelord :Computational Fluid Dynamics; Combustion; Gas Turbine; Emission reduction; Flameless Combustion; Colorless Distributed Combustion; Technology and Engineering;

    Sammanfattning : Colorless distributed combustion (CDC) is a promising novel technology to reduce emissions of carbon monoxide and nitrogen oxides in gas turbine combustors. CDC features a different flame regime than conventional gas turbine combustors, associated with a distributed reaction zone and low and uniform temperatures due to dilution of combustion air with exhaust gases. LÄS MER

  5. 5. Model of Thermal EHL Based on Navier-Stokes Equations : Effects of Asperities and Extreme Loads

    Master-uppsats, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Marko Tošić; [2019]
    Nyckelord :;

    Sammanfattning : A common approach in numerical studies of elastohydrodynamic lubrication (EHL) is based on solving the Reynolds equation that governs pressure distribution in thin lubricant films. The Reynolds equation is derived from the Navier-Stokes equations by taking assumptions that are considered valid when the thickness of the lubricant film is much smaller than its length. LÄS MER