Search for dissertations about: "wing section"

Found 5 swedish dissertations containing the words wing section.

2. 1. Large Eddy Simulations of Separated Compressible Flows around Wing Sections

   Author : Jörgen Held; Strömningsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulence; subgrid-scale; shock-boundary layer interaction; wing section; transonic; subsonic; compressible; separated; Large eddy simulation; LES; PVM; Mechanical engineering; hydraulics; vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik;

   Abstract : This thesis concerns numerical calculations of compressible separated flows, with and without shocks, around wing sections using Large Eddy Simulations (LES). The considered geometries are the NACA 0012 wing section and the ONERA AT15A wing section. READ MORE

4. 2. Prediction of Wing Section Lift and Drag from Numerical Solutions of the Navier-Stokes Equations

   Author : Björn Regnström; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; airfoil; incompresible flow; computational fluid dynamics; transition; numerical analysis; boundary layer stability;

   Abstract : A Navier-Stokes finite difference method is developed and applied to two-dimensional, incompressible, viscous flow around wing sections at medium to high Reynolds numbers. An important feature of such flows is laminar boundary layers with spatially amplified Tollmien-Schlichting waves initiating transition to turbulence. READ MORE

5. 3. On the Scattering Reduction of an Aircraft Wing Profile Enclosing an Antenna

   Author : Alireza Motevasselian; Lars Jonsson; Daniel Sjöberg; KTH; []
   Keywords : ;

   Abstract : In this thesis we study the radar cross section reduction and transparency of anantenna radome placed in the front part of an aircraft wing. The antenna, notstudied here, is a linearly polarized antenna operating at 1 GHz with abandwidth of 30%. READ MORE

6. 4. Elections, party politics and economic policy

   Author : Per Pettersson Lidbom; Alberto Alesina; Stockholms universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; nationalekonomi;

   Abstract : This thesis consists of three papers on elections, party politics and economic policy.Do Parties Matter for Fiscal Policy Choices addresses the question whether parties matter for fiscal policy, i.e., government spending and the level of taxes. READ MORE

7. 5. Wings, turbulent boundary layers and flow separation

   Author : Fermin Mallor; Philipp Schlatter; Ricardo Vinuesa; Ramis Örlü; Manuel García Villalba; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wings; turbulent boundary layers; adverse pressure gradients; flow separation; numerical simulations; wind-tunnel experiments; flow control.; Vingar; turbulenta gränsskikt; negativa tryckgradienter; avlösning; numeriska simuleringar; vindtunnel-experiment; flow control; Aerospace Engineering; Flyg- och rymdteknik; Teknisk mekanik; Engineering Mechanics;

   Abstract : The present doctoral thesis investigates the turbulent flow developing around wing sections, focusing on the impact of adverse-pressure-gradient (APG) conditions on turbulent boundary layers (TBLs) and the physics of flow separation. Both experimental and numerical methods are employed to generate high-fidelity data sets and provide an in-depth analysis of the flow. READ MORE