Abstract
The influence of spanwise perturbations on the transition to turbulence of a strong adverse pressure gradient (APG), laminar separated boundary layer is studied by direct numerical simulation using a high resolution numerical scheme. The perturbations are generated by positioning a discrete roughness element with a sinusoidally varying height in the spanwise direction, close to the inflow. Results indicate that the dynamics of the transition to turbulence mechanism are altered significantly due to the accelerated flow in the openings in the roughness element and the subsequent 3D instability.
Original language | English |
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Pages (from-to) | 69-77 |
Number of pages | 9 |
Journal | Procedia IUTAM |
Volume | 14 |
DOIs | |
Publication status | Published - 2015 |
Event | 8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014 - Rio de Janeiro, Brazil Duration: 8 Sept 2014 → 12 Sept 2014 |
Bibliographical note
Publisher Copyright:© 2015 The Authors.
Keywords
- direct numerical simulation
- instability
- roughness
- separated flow
- transition to turbulence