COHERENT VORTICAL AND STRAINING STRUCTURES IN THE FINITE WALL-MOUNTED SQUARE CYLINDER WAKE
Bibliographic record
Abstract
Topological aspects of the turbulent wake of a finite, surface-mounted, square-cross-section cylinder of h/d = 4 are addressed by decomposing the velocity field into a quasi-periodic coherent part and deviations therefrom as unresolved incoherent fluctuations. The three-dimensional large scale structure is educed through a reconstruction of phase-averaged PIV x-y and x-z measurement planes using the simultaneously sampled surface pressure difference on either side of the obstacle as a phase reference. A topological model for the vortex structure is educed and an explanation for mean streamwise wake vorticity is given in terms of the connections between initially vertical structures shed alternately from either side of the obstacle, rather than 'tip' vortex structures generated at the obstacle free-end as proposed in other studies. The coherent structure educed accounts for a significant portion of the fluctuating energy in the wake. The turbulent field is analyzed by finding Lagrangian straining structures that form by induction of the vorticity field, and these structures are related to the energy transfer from the base phase-averaged flow.
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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".