Sökning: "Boundary layer"

Visar resultat 6 - 10 av 472 avhandlingar innehållade orden Boundary layer.

1. 6. Receptivity of Boundary-Layer Flows over Flat and Curved Walls

   Författare :Lars-Uve Schrader; Luca Brandt; Dan Stefan Henningson; Gregoire Casalis; KTH; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

3. 7. Experimental studies of turbulent boundary layer separation and control

   Författare :Kristian Angele; KTH; []
   Nyckelord :turbulence; boundary layer; separition; adverse pressure graddient;

   Sammanfattning : The object ofthe present work is to experimentally study thecase ofa turbulent boundary layer subjected to an AdversePressure Gradient (APG) with separation and reattachment. Thisconstitutes a good test case for advanced turbulence modeling. LÄS MER

4. 8. Experimental study of the rotating-disk boundary-layer flow

   Författare :Shintaro Imayama; Henrik Alfredsson; Rebecca Lingwood; Benoît Pier; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid mechanics; boundary layer; rotating disk; laminar-turbulent transition; convective instability; absolute instability; secondary instability; crossflow instability; hot-wire anemometry.;

   Sammanfattning : Rotating-disk flow has been investigated not only as a simple model of cross flow instability to compare with swept-wing flow but also for industrial flow applications with rotating configurations. However the exact nature of laminar-turbulent transi- tion on the rotating-disk flow is still major problem and further research is required for it to be fully understood, in particular, the laminar-turbulent transition process with absolute instability. LÄS MER

5. 9. PIV measurements in a separating turbulent APG boundary layer

   Författare :Kristian Angele; KTH; []
   Nyckelord :Adverse pressure gradient APG ; Turbulent; Boundary layer; Separation; PIV;

   Sammanfattning : .... LÄS MER

7. 10. Studies of turbulent boundary layer flow throughdirect numerical simulation

   Författare :Martin Skote; KTH; []
   Nyckelord :Turbulence; direct numerical simulation; boundary layer; separation; parallel computers; turbulence modelling;

   Sammanfattning : .... LÄS MER