A POD INVESTIGATION OF THE THREE-DIMENSIONAL WALL JET NEAR FIELD
Bibliographic record
Abstract
A turbulent three-dimensional wall jet was investigated at an exit Reynolds number of 2.5×105 using Stereoscopic Particle Image Velocimetry (PIV) in the near-field region (x/D=5). The Proper Orthogonal Decomposition (POD) was applied to all three components of the velocity field to investigate the underlying coherent structures in the flow Low-dimensional reconstructions of the turbulent velocity field using the first 5 POD modes showed that the streamwise flow contours are significantly distorted from the mean. This was induced by coherent streamwise vortex structures formed in the outer shear-layers of the wall jet, not unlike those found in free jets. The reconstructed instantaneous streamwise vorticity indicates the presence of a persistent vortex pair close to the wall and on either side of the jet centreline that are similar to the mean streamwise vorticity. These regions do not appear to be directly related to the streamwise vortex structures in the outer shear-layers.
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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 | 0.000 |
| 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 | 0.001 | 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".