Search for dissertations about: "Roughness length method"

Showing result 1 - 5 of 30 swedish dissertations containing the words Roughness length method.

  2. 1. Scale dependency, hetrogeneity and anisotropy of surface roughness of rock fractures

    Author : Nader Fardin; KTH; []
    Keywords : Rock fracture; Roughness; Heterogeneity; Anisotropy; Fractals; Stationarity; Roughness length method; Statistical analysis; Erroranalysis; 3D-laser scanning;

    Abstract : .... READ MORE

  4. 2. The effect of scale on the morphology, mechanics and transmissivity of single rock fractures

    Author : Nader Fardin; KTH; []
    Keywords : Anisotropy; Aperture; Asperity degradation; Contact area; Finite Element Method FEM ; Flow analysis; Fractals; Fracture morphology; Heterogeneity; Stress-deformation; Surface roughness; Roughness-Length method; Scale dependency; Stationarity; Transm;

    Abstract : This thesis investigates the effect of scale on themorphology, mechanics and transmissivity of single rockfractures using both laboratory and in-situ experiments, aswell as numerical simulations. Using a laboratory 3D laserscanner, the surface topography of a large silicon-rubberfracture replica of size 1m x 1m, as well as the topography ofboth surfaces of several high-strength concrete fracturereplicas varying in size from 50mmx50mm to 200mm x 200mm, werescanned. READ MORE

  5. 3. Receptivity of Boundary-Layer Flows over Flat and Curved Walls

    Author : Lars-Uve Schrader; Luca Brandt; Dan Stefan Henningson; Gregoire Casalis; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Boundary-layer receptivity; laminar-turbulent transition; swept-plate boundary layer; Görtler flow; leading-edge effects; swept-wing flow; crossflow vortices; Görtler rolls; disturbance streaks; wall roughness; free-stream turbulence; Fluid mechanics; Strömningsmekanik;

    Abstract : Direct numerical simulations of the receptivity and instability of boundary layers on flat and curved surfaces are herein reported. Various flow models are considered with the aim to capture aspects of flows over straight and swept wings such as wall curvature, pressure variations, leading-edge effects, streamline curvature and crossflow. READ MORE

  6. 4. Homogenization of Reynolds equations and of some parabolic problems via Rothe's method

    Author : Emmanuel Kwame Essel; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matematik; Mathematics;

    Abstract : This PhD thesis is focussed on some problems of great interest in applied mathematics. More precisely, we investigate some new questions in homogenization theory, which have been motivated by some concrete problems in tribology. READ MORE

  7. 5. Online optical method for real-time surface measurement using line-of-light triangulation

    Author : Mohammad Anzar Alam; Mattias O'Nils; Jan Thim; Anatoliy Manuilskiy; Mittuniversitetet; []
    Keywords : ;

    Abstract : Real time paper surface-web measurement is one of the challenging research fields. The traditional laboratory method has many limitations and is unable to measure the entire tambour during the manufacturing process. It has been necessary to develop an online technique that could measure the surface topography in real time. READ MORE