Search for dissertations about: "free flow"

Showing result 1 - 5 of 475 swedish dissertations containing the words free flow.

2. 1. Free Ensemble Improvisation

   Author : Harald Stenström; Göteborgs universitet; []
   Keywords : HUMANIORA; HUMANITIES; aleatorics; artistic research; attractor state; central tone; chaotic systems; collective understanding; comprovisation; conceptual model; directed motion; ensemble size; feedback and feedforward; free ensemble improvisation; gesture; importance of rhythm; indeterminacy; interactional skill; listening skill; musical evaluation; musical interaction; musical maturity; musical chemistry; musical interpretation; musical composition; non-idiomatic improvisation; rhythmic flow; sound properties; stylistic influences;

   Abstract : The aim of this doctoral project has been to study so-called non-idiomatic improvisation in ensembles consisting of two or three musicians who play together without any restrictions regarding style or genre and without having predetermined what is to be played or how they should play. The background to this thesis has been the author’s own free improvising, which he has pursued since 1974, and the questions that have arisen whilst music-making. READ MORE

4. 2. Numerical investigation of the flow and instabilities at part-load and speed-no-load in an axial turbine

   Author : Jelle Kranenbarg; Michel Cervantes; Lisa Prahl Wittberg; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Speed-no-load; vortical flow structures; flow instabilities; rotating stall; mitigation; independent guide vanes; axial turbine; swirling flow; off design operation; URANS; parametric study; blade clearance; head losses; diffusor; GEKO model; flow separation; hydraulic turbine; Strömningslära; Fluid Mechanics;

   Abstract : Global renewable energy requirements rapidly increase with the transition to a fossil-free society. As a result, intermittent energy resources, such as wind- and solar power, have become increasingly popular. However, their energy production varies over time, both in the short- and long term. READ MORE

5. 3. Fossil Free or Not - That is the Question

   Author : Torbjörn Skytt; Bengt-Gunnar Jonsson; Monica Odlare; Markku Rummukainen; Mittuniversitetet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fossil free; Carbon balance; Carbon flow; Energy flow; Climate mitigation; Governing climate change; Forest carbon;

   Abstract : This is an evaluation of Jämtland County’s ability to achieve its climate targets to reduce greenhouse gas (GHG) emissions with 10% annually, and to become fossil fuel free 2030. There is a risk that the target to become fossil fuel-free, relying primarily on outtake of forest biomass, contradicts with the target in the UN Paris Agreement to keep the global temperature increase below 1. READ MORE

6. 4. Effects of free-stream turbulence and three-dimensional roughness on boundary layer transition

   Author : Santhosh Babu Mamidala; Jens H. M. Fransson; Bengt E. G. Fallenius; Jonathan Morrison; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary-layer transition; intermittency; free-stream turbulence; electret microphones; isolated roughness; sinuous instability; varicose instability; Engineering Mechanics; Teknisk mekanik;

   Abstract : External disturbances such as free-stream turbulence (FST), and isolated three-dimensional roughness are strong disturbance sources to the laminar boundary layers (BLs), which can lead to a rapid transition to turbulence. The transition process eventuates to increase in skin-friction coefficient and heat transfer rate and hence, both of the aforementioned disturbance sources have practical importance. READ MORE

7. 5. Potential Flow Panel Methods for the Calculation of Free-surface Flows with Lift

   Author : Carl-Erik Janson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; desingularized; shape optimization; Rankine source; waves; OCTOPUS; dipole; MMA; Dawson operator; boundary layer; vortex; Method of Moving Asymptotes; nonlinear; sailing yacht; four point operator; surface piercing wing; Navier-Stokes; numerical method; lift force; raised panel method; discrete Fourier transform; collocation point shift; potential flow; CFD; free surface; induced drag; SHIPFLOW; dispersion; damping; analytical method; hydrofoil;

   Abstract : Two non-linear Rankine-source panel methods are developed and implemented in the same computer code. The first method uses a four-point upwind operator on the free-surface to compute the velocity derivatives and to enforce the radiation condition while the second method uses an analytical expression for the velocity derivatives and a collocation point shift one panel upstream to prevent upstream waves. READ MORE