Sökning: "Reynolds number"

Visar resultat 1 - 5 av 219 avhandlingar innehållade orden Reynolds number.

1. 1. Contributions to Evolutionary Computation

   Författare :Pierre Arne Ingvar Wijkman; Robert Reynolds; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer and systems science; Data- och systemvetenskap; data- och systemvetenskap; Computer and Systems Sciences;

   Sammanfattning : We present in this thesis (1) an alternative model in the field of evolutionary computation, and (2) an experimental platform that can be used to evaluate and compare many different models in evolutionary computation.The presented model is, like other models in evolutionary computation, based on the principle of natural selection. LÄS MER

3. 2. Settling disputes at the World Trade Organization

   Författare :Louise Johannesson; Magnus Lodefalk; Hildegunn Kyvik Nordås; Dan Johansson; Kara M. Reynolds; Örebro universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; World Trade Organization; trade policy; trade disputes; dispute settlement; causality; panels; developing countries; panels; international trade;

   Sammanfattning : This cumulative dissertation consists of five self-contained essays, all of which are closely focused around issues that concern the WTO dispute settlement mechanism (DSM). In Essay 1, we describe salient features of the DSM using a unique data set. LÄS MER

4. 3. Structure of Zero Pressure Gradient High Reynolds Number Turbulent Boundary Layers

   Författare :Murat Tutkun; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fourier decomposition.; proper orthogonal decomposition; large scale structures; Turbulent boundary layers; zero pressure gradient; wind tunnel; calibration; cross-correlations; hot-wire; two-point correlations; high Reynolds number;

   Sammanfattning : This thesis presents part of the large research program funded by the European Commission calledWallturb: A European synergy for the assessment of wall turbulence. The main aim of this researchprogram is to create new experimental and numerical databases on the characteristics of turbulent wall-bounded flows, especially turbulent boundary layers. LÄS MER

5. 4. Numerical Simulation of High Reynolds Number Wall Bounded Flow

   Författare :Tobias Persson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; subgrid model; DES; high; validation; LES; numerical simulation; near-wall;

   Sammanfattning : In this thesis, four different numerical methods are used for predictions of high Reynoldsnumber (Re), wall bounded flows; Large Eddy Simulation (LES) with two different subgrid(turbulence) models, the One Equation Eddy Viscosity model (OEEVM) and the MixedModel (MM), Monotone Integrated LES (MILES), Detached Eddy Simulation (DES) andReynolds Averaged Navier Stokes (RANS). The LES calculations are combined with a wallmodel based on the law-of-the-wall and in DES a hybrid RANS/LES method is used forhandling the near wall region. LÄS MER

7. 5. Numerical Study of Laminar, Transitional and Turbulent Flow Past Rectangular Cylinders

   Författare :Ahmad Sohankar Esfahani; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; blockage; outlet boundary condition; rectangular cylinders; onset of vortex shedding; angle of incidence; incompressible flow; LES; DNS; transition; finite volumes; Reynolds number; numerical simulation; square cylinder;

   Sammanfattning : The subject of flow past slender bluff bodies is of relevance to technical problems associated with energy conservation, structural design and acoustic emissions. The present work is restricted to an important sub-class of slender bluff body flow --- the incompressible flow around a stationary cylinder having a rectangular cross section, the cylinder being exposed to a constant free stream velocity. LÄS MER