An experimental investigation of turbulent boundary layer flow over surface-mounted circular cavities
Bibliographic record
Abstract
Turbulent boundary layer flow over cavities of circular planform has been measured experimentally by examining pressures at the cavity surfaces and velocity and turbulence in the cavity wake for cavity depths ( h) of 0.20, 0.47, and 0.70 D (cavity diameter). Tests were conducted at a constant Mach number of 0.08 resulting in Re X = 7.3 × 10 6 and Re D = 1.3 × 10 5 . Velocity measurements acquired in the cavity wake, using hot-wire anemometry, suggest the existence of an asymmetric trailing vortex for h/D ≍ 0.5. The increased amplitude of broadband low-frequency pressure oscillations observed at h/ D ≍ 0.5 may be a result of the high level of flow asymmetry and cavity drag observed for this depth and not for other depths tested. Also, a faint peak is seen in the power spectrum for this depth at a Strouhal number related in previous work to cavity feedback resonance. Contours of fluctuation pressures at the cavity surfaces are also presented. Details of a flow-switching control mechanism for the asymmetric trailing vortex noted for h/D ≍ 0.5 are also presented herein. Good agreement was noted between the present results and those from previous investigations.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".