Effects of Aspect Ratio on Asymmetric Wake Flow Structure Around Right-Trapezoidal Prisms
Bibliographic record
Abstract
Abstract In this paper, the turbulent flow characteristics around right-trapezoidal prisms with varying streamwise aspect ratios (AR, ratio of upper length to prism height) of AR = 0.6, AR = 2, and AR = 2.5 in a uniform flow were investigated using particle image velocimetry (PIV). The Reynolds number (based on the free-stream velocity and body height) is Reh = 10000, and the results are analyzed in terms of the mean velocities, Reynolds stresses, and probability density function (PDF). The results show that two recirculation bubbles form in the wake region of all prisms. The bubbles are asymmetrical, with the upper recirculation bubble larger than the lower one. For the AR = 2.5, an additional bubble is observed on the upper surface of the prism. Contours of the streamwise Reynolds normal stress show dual peaks, which are located above and below the centerline in the wake region. The magnitude of the peak above the centerline is comparably higher for AR = 2.5 than for AR = 0.6 and 2.0. Conversely, the vertical Reynolds normal stress shows a single peak with increasing magnitude as the aspect ratio rises. Regardless of aspect ratio, the PDF of streamwise fluctuating velocity displays an unimodal distribution, while vertical velocity fluctuation shows a bimodal distribution at the point of maximum vertical fluctuating velocity.
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How this classification was reachedexpand
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 | 0.001 |
| 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)
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 teacher head, 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".