Turbulent Characteristics of the Wake Flow Around Rectangular and Trapezoidal Prisms in Uniform Flow
Bibliographic record
Abstract
Abstract The turbulent characteristics of flow separation induced by a trapezoidal and two rectangular prisms immersed in a uniform flow were studied experimentally using particle image velocimetry. The streamwise aspect ratios (AR) of the two rectangular prisms were 3 and 4. The streamwise AR of the trapezoidal prism was based on its upper length and was 3. The Reynolds number based on the freestream velocity and the prism height was 14700. The flow topology of symmetrical wake flows over and behind the rectangular prisms and asymmetrical wake flow over and behind the trapezoidal prism were analyzed using the mean flow and Reynolds stresses. The results indicate that the mean flow reattaches onto the rectangular prisms but does not reattach onto the trapezoidal prism. Dual local regions of elevated streamwise Reynolds normal stress occur in the wake region irrespective of AR and the body geometry. However, the dual elevated regions are only symmetric about the horizontal centerline of two rectangular prisms. Probability density function (PDF), two-point correlations and proper orthogonal decomposition (POD) analyses were employed to investigate the dynamics of the coherent structures formed over and behind the prisms.
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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 | 0.000 |
| 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 | 0.001 |
| 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".