Computational study of flow structures in the boundary layer at the transition to turbulence behind zigzag strips

MSc graduation project of Maarten Kerkvliet
Location: Lab. for Aero & Hydrodynamics
Supervisors: G.E. Elsinga & M.J.B.M. Pourquie
Start of project: May 2010

Project description:

Turbulence is notorious for increasing skin friction and friction drag, but it can actually be advantageous is specific cases by preventing flow separation and significantly reducing pressure drag. Therefore, turbulence is sometimes forced purposely using tripping wires. A well-known example is the zigzag strips, which speed skaters attach to their suits and also very often applied on gliders. In this project we want to better understand the way turbulence is created directly behind such strips, especially the development of the structures in the flow. This will be done with use of Direct Numerical Simulation (DNS). This is a simulation in which the Navier-Stokes equations are numerically solved without any turbulence model. The results will be compared with PIV (Paricle Image Velocimetry) data from experimental work.

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