Effect of Reynolds number on the large structure of turbulent boundary layers
Abstract
A hypothesis is proposed which predicts the effect of Reynolds number variations on the decay times of the large scale structures in turbulent boundary layers. The hypothesis is based on the effects of viscous diffusion on a hairpin shaped vortical structure, but neglects the effects of stretching. The hypothesis is found to correlate well with existing measurements of decay distances. In contrast, the results of new experimental measurements of decay distances are presented and found to be in conflict with the hypothesis. However, preliminary considerations indicate that the disagreement may be resolved by modifying the hypothesis to include the effects of stretching.
- Publication:
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29th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1991
- Bibcode:
- 1991aiaa.meetQU...S
- Keywords:
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- Flow Characteristics;
- Flow Visualization;
- Reynolds Number;
- Turbulent Boundary Layer;
- Decay Rates;
- Free Flow;
- Space-Time Functions;
- Turbulent Wakes;
- Fluid Mechanics and Heat Transfer