Search for dissertations about: "curvature flow"

Showing result 1 - 5 of 63 swedish dissertations containing the words curvature flow.

  2. 1. On one approximation scheme for generalised mean curvature flow

    Author : Richards Grzhibovskis; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; convolution-tresholding scheme; viscosity solution; level-set equation; curvature flow; kinetic modeling; curvature flow;

    Abstract : .... READ MORE

  4. 2. Experimental study of turbulent flows through pipe bends

    Author : Athanasia Kalpakli; P. Henrik Alfredsson; Ramis Örlü; Christoph Brücker; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulent flow; swirl; pulsation; pipe bend; hot-wire anemometry; cold-wire anemometry; laser Doppler velocimetry; stereoscopic particle image velocimetry.;

    Abstract : This thesis deals with turbulent flows in 90 degree curved pipes of circular cross-section. The flow cases investigated experimentally are turbulent flow with and without an additional motion, swirling or pulsating, superposed on the primary flow. READ MORE

  5. 3. Some non-linear geometric and kinetic evolutions and their approximations

    Author : Richards Grzhibovskis; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; curvature flow; Willmore flow; convolution-thresholding; homothetic geometric flows; Boltzmann equation; deterministic methods; non-uniform grids; curvature flow;

    Abstract : This thesis deals with three non-linear evolution problems: mean curvature flow, Willmore flow, and the evolution of solutions to the space homogeneous Boltzmann equation. Generalized mean curvature flows are also considered. A major part of the study focuses on the construction of approximations to these evolutions. READ MORE

  6. 4. Vortices in turbulent curved pipe flow-rocking, rolling and pulsating motions

    Author : Athanasia Kalpakli Vester; P. Henrik Alfredsson; Ramis Örlü; Nils Tillmark; Knud Meyer; KTH; []
    Keywords : Turbulence; curved pipes; swirling flow; pulsatile flow; time-resolved stereoscopic particle image velocimetry; hot-wire anemometry; proper orthogonal decomposition; turbocharger;

    Abstract : This thesis is motivated by the necessity to understand the flow structure of turbulent flows in bends encountered in many technical applications such as heat exchangers, nuclear reactors and internal combustion engines. Flows in bends are characterised by strong secondary motions in terms of counter-rotating vortices (Dean cells) set up by a centrifugal instability. READ MORE

  7. 5. Mass Conserving Simulations of Two Phase Flow

    Author : Elin Olsson; Gunilla Kreiss; Stig Larsson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; free boundary; two phase flow; level set method; conservative; Numerical analysis; Numerisk analys;

    Abstract : Consider a mixture of two immiscible, incompressible fluids e.g. oil and water. Since the fluids do not mix, an interface between the two fluids will form and move in time. READ MORE