Streamwise Variation of the Unsteady Pressure Field in the Three-Dimensional Wall Jet
Bibliographic record
Abstract
The streamwise variation in the unsteady wall pressure of a turbulent three-dimensional wall jet was examined experimentally. Based on the exit velocity and the nozzle diameter, the Reynolds number of the wall jet was 140,000. The fluctuating wall pressure was measured using a two-dimensional lateral-streamwise array of 89 condenser microphones from x/D=5 to 15. The instantaneous pressure fluctuations showed strong lateral antisymmetry, which appeared to be linked to the lateral development of the flow. Instantaneous intermittent events convected downstream through the entire measurement region but were observed to change speed, slow down, surge forward, and convect laterally. Power spectra for comparable streamwise positions at the centreline and off the centreline showed stronger organization off of the centreline. The power spectra off of the centreline had a more dominant peak than on the centreline. However, spectra at both locations exhibited a low frequency peak that did not appear to be convective; the significance of this peak is unclear.
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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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".