Sökning: "Stokes parameters"

Visar resultat 11 - 15 av 56 avhandlingar innehållade orden Stokes parameters.

  1. 11. Basal boundary conditions, stability and verification in glaciological numerical models

    Författare :Christian Helanow; Peter Jansson; Brian Hanson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Glaciology; subglacial hydrology; ice sheet modeling; basal boundary conditions; non-linear Stokes flow; Physical Geography; naturgeografi;

    Sammanfattning : To increase our understanding of how ice sheets and glaciers interact with the climate system, numerical models have become an indispensable tool. However, the complexity of these systems and the natural limitation in computational power is reflected in the simplifications of the represented processes and the spatial and temporal resolution of the models. LÄS MER

  3. 12. Diffuse-Interface Simulations of Capillary Phenomena

    Författare :Walter Villanueva; Gustav Amberg; Steffen Hardt; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; capillary-driven flows; wetting; Cahn-Hilliard Navier-Stokes system; multicomponent and multiphase flows; parallel adaptive computing; Other engineering mechanics; Övrig teknisk mekanik;

    Sammanfattning : Fluid flows mainly driven by capillary forces are presented in this thesis. By means of modeling and simulations, interesting dynamics in capillary-driven flows are revealed such as coalescences, breakups, precursor films, flow instabilities, rapid spreading, rigid body motions, and reactive wetting. LÄS MER

  4. 13. Magnetic fields of cool active stars

    Författare :Lisa Rosén; Oleg Kochukhov; Eric Stempels; Andrew Collier Cameron; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stars: magnetic field; stars: late-type; stars: activity; stars: imaging; polarisation; starspots; Astronomy; Astronomi;

    Sammanfattning : Magnetic fields are present throughout the universe and are very important for many astrophysical processes. Magnetic field influences a star throughout its life and affects nearby objects such as planets. LÄS MER

  5. 14. Robust preconditioning methods for algebraic problems, arising in multi-phase flow models

    Författare :Xin He; Maya Neytcheva; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Scientific Computing; Beräkningsvetenskap;

    Sammanfattning : The aim of the project is to construct, analyse and implement fast and reliable numerical solution methods to simulate multi-phase flow, modeled by a coupled system consisting of the time-dependent Cahn-Hilliard and incompressible Navier-Stokes equations with variable viscosity and variable density. This thesis mainly discusses the efficient solution methods for the latter equations aiming at constructing preconditioners, which are numerically and computationally efficient, and robust with respect to various problem, discretization and method parameters. LÄS MER

  7. 15. On some Numerical Methods and Solution Techniques for Incompressible Flow Problems

    Författare :Xin He; Maya Neytcheva; Zhong-Zhi Bai; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : The focus of this work is on numerical solution methods for solving the incompressible Navier-Stokes equations, which consist of a set of coupled nonlinear partial differential equations.In general, after linearization and finite element discretization in space, the original nonlinear problem is converted into finding the solutions of a sequence of linear systems of equations. LÄS MER