Frequency Analysis of Surface Pressures on an Airfoil After Stall
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
At high angles of attack airfoils can be considered as bluff bodies and their shedding frequency can be important to designers if it becomes too close to the natural frequency or a harmonic of the natural frequency of the object. This paper details the results from a thick, symmetric airfoil, a NACA 0021 section, at a Reynolds number of 2.70 × 10. At high angles of attack shedding frequencies were found in both the lift and the drag. The main frequency was at half the frequency of the secondary frequency as would be expected for a bluff body although the asymmetry in the wake caused both frequencies to be present in the lift and drag. These frequencies could be scaled by the width of the chord normal to the freestream such that the Strouhal number was nearly constant with angle of attack. The major shedding peak occurred at an angle of attack of 50 degrees, predominately in the lift.
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.
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it