Proper Orthogonal Decomposition of the Unsteady Pressure Field in the Three-Dimensional Wall Jet
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Bibliographic record
Abstract
The streamwise variation in the unsteady wall pressure of a turbulent three-dimensional wall jet was examined using Proper Orthogonal Decompostion. 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. The first two POD modes were antisymmetric and the next few higher modes appeared to be associated with lateral meandering of the jet. Loworder reconstructions of fluctuating wall pressure displayed the intermittency and meandering observed in the unsteady pressure field.
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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)
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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