Bibliographic record
Abstract
Open-loop control in the near wake of a disk in subsonic air and water flows was investigated using particle image velocimetry at a Reynolds number based on the disk diameters of 67,000 and 20,000, respectively. The air model had tabs along the edge that were driven radially by electromagnetic actuators, and the water model had slots connected to a piston and cylinder external to the flow. In both systems, the frequency of actuation could be varied, and in air, the spatial extent of the forcing could be controlled. Symmetrical actuation produced a reduction in the recirculation-region length of 10% for both air and water. Additionally, a helical excitation at the fundamental natural vortex-shedding frequency in air caused a reduction of 15 % and caused the wake to oscillate strongly in phase with the excitation. The most effective symmetrical actuation frequencies correspond to twice the natural frequency of the asymmetric mode in the unforced wake. The effects of actuation on the instantaneous and mean velocity fields are presented and discussed in detail.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".