Direct numerical simulation of acoustic reduction using serrated trailing-edge on an isolated airfoil
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Bibliographic record
Abstract
Broadband noise produced by the trailing edge of a controlled diffusion (CD) airfoil with a serrated trailing edge in the actual anechoic wind-tunnel test configuration is directly simulated using a Lattice-Boltzmann method at a high Reynolds number of 1.5× 10 typical of actual ventilation systems and low pressure turbomachinery stages. Such an unique simulation resolves both the aerodynamic and acoustic field around the airfoil. The comparison of the airfoil loading, the wall-boundary layer development, and the near-wake flow between the clean and serrated configurations is systematically performed and results are compared with the detailed experimental database available for the clean airfoil. A slight lift reduction is found with the serrations near the trailing-edge. The turbulent wallpressure fluctuations on the airfoil suction-side are only slightly modified. Because of the serrations the pressure and suction side boundary layer flows merge differently than in the clean case, modifying the near-wake evolution with larger coherent hairpin structures. The slight vortex shedding observed on the pressure side of the clean airfoil is also suppressed. Finally a noise reduction is captured between 1000 and 3500 Hz in all direction except in the wake direction where a slight noise increase is noticed.
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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 | 0.000 | 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 it