Large Eddy Simulation Of A Rotor Stage For Fan Noise Source Diagnostic
Bibliographic record
Abstract
A Large Eddy Simulation (LES) of the NASA Source Diagnostic Test turbofan is performed focusing on a single rotor blade without the stator vanes to put emphasis on the grid resolution in both the tip clearance and the rotor wake without any potential effect from the stator. The investigated operating condition is representative of approach conditions for which the rotor is operating out-of-design. Good agreement with aerodynamic measurements is observed at two different axial positions for the mean and wake turbulence values. In the LES, the boundary layer naturally transitions to turbulence on the blade suction side but remains quasi laminar over most of its pressure side. Flow visualizations capture the tip leakage flow and the complex influence of resolved coherent structures in the boundary layer and wake development. Last, the Power Spectral Density is analyzed in the wake and on the blades for the axial velocity and pressure fluctuations respectively.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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) | 0.003 | 0.001 |
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; both teacher heads agree on what is shown here.
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".