On the phase velocities of the motions in an offset attaching planar jet
Bibliographic record
Abstract
An experimental investigation was performed to characterize the phase velocity of different frequency fluctuations in a turbulent offset attaching jet with a Reynolds number of 44 000 and initial offset distance of H j . The velocities were determined from the change in the phase of the cross-spectra of the fluctuating pressure along the wall and the cross-spectra of the fluctuating wall pressure and fluctuating velocity throughout the flow. The results showed there was upstream propagation of the wall pressure fluctuations near the separation point associated with the flapping motion, but the upstream propagation apparent in the correlation coefficient of the pressure was due to higher frequency fluctuations associated with the recirculating flow. The phase velocities determined from the pressure–velocity cross-spectra for the higher frequency motions showed less-frequency dependence and less acceleration than those determined from the pressure cross-spectra. There was also evidence of two velocities for the shear layer motions and a velocity for the lower frequency wall jet motions not apparent in the results from the pressure cross-spectra. Thus, the phase velocities determined from pressure cross-spectra do not fully reflect the velocities of the motions in the flow.
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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".