Local structure of boundary layer transition in experiments with a single streamwise vortex
•Response of subcritical boundary layer to isolated, embedded, streamwise vortex.•Non-inclined high shear layer rolls up and vortices tear away during transition.•Vortex passing frequency scales with square of freestream velocity.•Large ejection events in outer layer.•Some features common to FST-ind...
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| Published in | Experimental thermal and fluid science Vol. 68; pp. 381 - 391 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
01.11.2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0894-1777 1879-2286 |
| DOI | 10.1016/j.expthermflusci.2015.06.013 |
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| Abstract | •Response of subcritical boundary layer to isolated, embedded, streamwise vortex.•Non-inclined high shear layer rolls up and vortices tear away during transition.•Vortex passing frequency scales with square of freestream velocity.•Large ejection events in outer layer.•Some features common to FST-induced, and roughness-induced transition identified.
Transition induced by an isolated streamwise vortex embedded in a flat plate boundary layer was studied experimentally. The vortex was created by a gentle hill with a Gaussian profile that spanned on half of the width of a flat plate mounted in a low turbulence wind tunnel. PIV and hot-wire anemometry data were taken. Transition occurs as a non-inclined shear layer breaks up into a sequence of vortices, close to the boundary layer edge. The passing frequency of these vortices scales with square of the freestream velocity, similar to that in single-roughness induced transition. Quadrant analysis of streamwise and wall-normal velocity fluctuations show large ejection events in the outer layer. |
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| AbstractList | Transition induced by an isolated streamwise vortex embedded in a flat plate boundary layer was studied experimentally. The vortex was created by a gentle hill with a Gaussian profile that spanned on half of the width of a flat plate mounted in a low turbulence wind tunnel. PIV and hot-wire anemometry data were taken. Transition occurs as a non-inclined shear layer breaks up into a sequence of vortices, close to the boundary layer edge. The passing frequency of these vortices scales with square of the freestream velocity, similar to that in single-roughness induced transition. Quadrant analysis of streamwise and wall-normal velocity fluctuations show large ejection events in the outer layer. •Response of subcritical boundary layer to isolated, embedded, streamwise vortex.•Non-inclined high shear layer rolls up and vortices tear away during transition.•Vortex passing frequency scales with square of freestream velocity.•Large ejection events in outer layer.•Some features common to FST-induced, and roughness-induced transition identified. Transition induced by an isolated streamwise vortex embedded in a flat plate boundary layer was studied experimentally. The vortex was created by a gentle hill with a Gaussian profile that spanned on half of the width of a flat plate mounted in a low turbulence wind tunnel. PIV and hot-wire anemometry data were taken. Transition occurs as a non-inclined shear layer breaks up into a sequence of vortices, close to the boundary layer edge. The passing frequency of these vortices scales with square of the freestream velocity, similar to that in single-roughness induced transition. Quadrant analysis of streamwise and wall-normal velocity fluctuations show large ejection events in the outer layer. |
| Author | Manu, K.V. Mathew, Joseph Dey, J. |
| Author_xml | – sequence: 1 givenname: K.V. surname: Manu fullname: Manu, K.V. email: manu@aero.iisc.ernet.in – sequence: 2 givenname: J. surname: Dey fullname: Dey, J. email: jd@aero.iisc.ernet.in – sequence: 3 givenname: Joseph surname: Mathew fullname: Mathew, Joseph email: joseph@aero.iisc.ernet.in |
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| Keywords | Streamwise vortex Boundary layer transition Streak instability Quadrant analysis Shear-layer breakup Particle Image Velocimetry |
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| Snippet | •Response of subcritical boundary layer to isolated, embedded, streamwise vortex.•Non-inclined high shear layer rolls up and vortices tear away during... Transition induced by an isolated streamwise vortex embedded in a flat plate boundary layer was studied experimentally. The vortex was created by a gentle hill... |
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| SubjectTerms | Boundary layer Boundary layer transition Flat plates Fluid dynamics Fluid flow Particle Image Velocimetry Quadrant analysis Shear layers Shear-layer breakup Streak instability Streamwise vortex Turbulence Turbulent flow Vortices Wind tunnels |
| Title | Local structure of boundary layer transition in experiments with a single streamwise vortex |
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