Partial sheltering effects on spanwise wake interference of unequal-height tandem finite wall-mounted cylinders
Bibliographic record
Abstract
The effects of partial sheltering on the unsteady flow dynamics of unequal-height tandem finite wall-mounted cylinders fully submerged in a turbulent boundary layer (TBL) were investigated using time-resolved particle image velocimetry. The height ratio of the cylinders was kept constant at h / H = 0.75 , where h and H are the heights of the upstream cylinder (UC) and downstream cylinder (DC), respectively. The center-to-center spacing between the cylinders was 4 d , the Reynolds number based on the cylinder diameter ( d ) was 5540 and the submergence ratio was δ / H = 1.2 , where δ is the TBL thickness. Measurements were also performed for a single cylinder (SC) with a similar aspect ratio ( H / d = 7 ) as the DC. Spatio-temporal characteristics in three streamwise-spanwise planes along the height of the tandem cylinders (TC) and the SC were examined to understand the impact of partial sheltering on the mean wake structure, pumping motion of the reverse flow region, spanwise shear layer growth, and cellular vortex shedding behavior. The results showed that wake interference by the DC enhanced the near-wall pumping motion and integral time scales, while reducing the vortex shedding frequency behind the UC compared to the SC. For the DC, the attachment of the spanwise shear layers from the UC significantly accelerated vortex formation of smaller structures and delayed vortex formation at the unsheltered free end. As a result, the reverse flow region was reduced in the sheltered portion but enhanced near the free end of the DC.
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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 | 0.000 |
| 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)
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".