Characterization of Vortex Dynamics in a Laminar Separation Bubble
Why this work is in the frame
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Bibliographic record
Abstract
The development of coherent structures within the laminar separation bubble that forms on a NACA 0018 airfoil at an angle of attack of 8 deg and a chord-based Reynolds number of 100,000 is investigated experimentally. A combination of high-speed flow visualizations and time-resolved surface pressure measurements is used to enable quantitative analysis of vortex dynamics. The amplification of disturbances in the separated shear layer leads to the formation of rollup vortices that are shed upstream of the mean reattachment location. The experimental results show that these structures produce distinct, periodic surface pressure fluctuations that can be used to detect, track, and characterize the rollup vortices. A vortex tracking technique is developed and validated in the present investigation. The developed methodology is used to investigate temporal and spatial variation in vortex shedding parameters and to study attendant vortex interactions, which involve merging of two or more consecutive vortices. The results provide new insight into vortex dynamics in laminar separation bubbles, and the developed technique can serve as an efficient tool for future studies and active flow control implementation.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it