Influence of Upwash Flow Disturbance on Flow-Induced Cavity Resonance
Bibliographic record
Abstract
Flows grazing over open cavities may cause self-sustained oscillations at the resonance frequencies of the cavity. The excitation mechanism of the self-oscillations is best described in terms of the time-varying circulation of large scale vortical flow structures within the shear layer region of the cavity orifice. In the present study, the influence on coherent span-wise vortical structures of a transverse volume flow created by imposing a periodic upwash through spoiler oscillations at the cavity leading edge was investigated. The relationship be-tween the time-varying vorticity within the orifice region, the oscillating transverse acoustic (solenoidal) flow, and the acoustic response of the cavity was examined. Experiments were conducted using a cavity with an oscillating leading edge spoiler in a low Mach number (M∼0.1) flow. A Helmholtz resonator with orifice length to depth ratio L/d ∼ 1/3 was used. The results confirmed that suppression of the oscillations is achieved when the upwash velocity is both in phase with, and of similar amplitude as, the average acoustic particle velocity of the fluid mass within the orifice. I.
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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 | 0.000 | 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) | 0.001 | 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".