Shear Layer Instability in the Gap of Tandem Cylinders and Its Coupling With Higher Order Acoustic Modes
Bibliographic record
Abstract
Abstract This paper presents an experimental investigation of the aeroacoustic response from tandem cylinders in cross flow at different positions with respect to the acoustic particle velocity nodes and anti-nodes of different cross-modes. The objective is to better understand the role of the shear layer instability in the gap between the cylinders on the excitation of acoustic resonance and its coupling with higher-order acoustic modes. The results show that the tandem cylinders’ position with respect to the acoustic particle velocity anti-nodes of the cross-modes is a significant factor in determining the excitation of the dominant acoustic mode. Moreover, placing multiple rows of tandem cylinders at various positions with respect to the acoustic standing waves of the cross-modes in the duct promotes the coupling between the shear layer instability and the acoustic modes, even for the cases that didn’t trigger such excitation when the tandem cylinders were placed in a single row.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".