Flow around surface-mounted low-aspect-ratio rectangular flat plates
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Bibliographic record
Abstract
Abstract The mean flow around surface-mounted low-aspect-ratio rectangular flat plates was studied experimentally for four different aspect (height-to-width) ratios (AR = 1, 0.5, 0.35, 0.2) with the plate oriented normal to flow (at an angle of attack of β = 90°, where the angle of attack represents the rotation of the flat plate about its vertical axis). In addition, the mean wake of the plate of AR = 0.2 was studied at angles of attack from β = 90° to 10°. The Reynolds number was Re = 7.4 × 10 4 based on plate width and the boundary layer thickness relative to the plate width was δ / W = 0.83. At β = 90°, the near wake is dominated by the shear layer separating from the top of the plate and a large recirculation zone behind the plate. The far wake is characterised by one or two pairs of streamwise counter-rotating vortex structures. For AR = 1, downwash reaches the ground plane and there is a single pair of dipole structures. For AR = 0.5, 0.35, and 0.2, downwash does not reach the ground plane and there are two pairs of vortex structures: a stronger outer vortex pair and a weaker inner vortex pair. For the plate of AR = 0.2, as β is lowered from 90° to 10°, the mean wake shifts laterally, the outer and inner vortex pairs become asymmetric, and some vortex merging occurs. From β = 45° to 10°, the mean wake is dominated by a wing-tip (trailing) vortex adjacent to the ground plane, which induces additional streamwise vorticity of opposite sign. The maximum vortex strength and greatest peak vorticity occur from β = 30° to 45°, and the greatest vortex generator effectiveness (defined as the ratio of vortex circulation to aerodynamic drag) was found to occur at β = 30°.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it