Effect of Wind Tunnel Wall Adaptation on Flow Development Over a Circular Cylinder
Bibliographic record
Abstract
The effect of wall adaptation on flow development over a circular cylinder was investigated in an adaptive-wall wind tunnel. Flow over a circular cylinder with model blockage ratio of 17% was characterized via hot-wire velocity measurements and timeresolved surface pressure measurements. Measurements were made in three wall configurations: geometrically straight walls (GSW), aerodynamically straight walls (ASW), and streamlined walls (SLW). In GSW, the measured pressure drag was significantly greater than that obtained in SLW, which matched published experimental results at low blockage ratios. Blockage effects in GSW, such as flow acceleration and wake blockage, were reduced in ASW and even more so in the SLW configuration. The increase in Strouhal number observed in GSW and ASW was rectified to the expected value in SLW. The results suggest that while both the vortex shedding frequency and the shear layer instability frequency were higher in GSW due to blockage effects, the ratio of these frequencies was constant in all the wall configurations investigated.
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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".