Large Eddy Simulation of an Outflow butterfly valve
Why this work is in the frame
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Bibliographic record
Abstract
The present study focuses on the aeroacoustic aspects of an outflow butterfly valve that is used to maintain the pressure inside an airplane cabin. When flying at 17,000 ft, an annoying tonal noise has been reported and the flowwithin the valve is transonic. Large Eddy Simulations are performed on different setups in order to understand the noise mechanisms and results are compared with a 2D-rectangular channel butterfly valve representative of the actual geometry. The experimental valve allows performingwall-pressure measurements, Schlieren visualization and far-field noise investigation. Initial LES simulations with second order precision on a relatively coarse mesh have shown difficulties to reproduce the experimental results. Therefore, improvements are made in terms of configuration and numerical scheme leading to the two numerical setups investigated in this paper. Different aerodynamic behaviors, mostly in the shock/boundary layer interaction region, are observed between the two configurations with 0.1D and 0.3D span width. As for the acoustics, far-field computations with FW-H analogy will be compared with experiments for both cases.
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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