CFD Simulations of the Aeroacoustic Noise Generated by a Cavity Flow
Bibliographic record
Abstract
CFD simulations of the flow inside a cavity with a length to depth ratio (L/D) of 5 and a width to depth ratio (W/D) of 1 were performed using the 3D CFX code with the newly developed SAS (Scale Adaptive Simulation) turbulence model. The free-stream flow has a zero incidence and a Reynolds number of 1×106 (based on the cavity length). Two meshes were used with similar sizes and having different node distribution along the cavity regions. The former grid uses a constant step mesh along the cavity and the latter uses a stepwise mesh, which resolves much finer the shear layer at the start of the cavity. Predicted noise spectra at 10 monitor points, overall sound and Rossiter modes were compared to the experimental data. To complete this study, the effect of the sampling time was assessed. In general, the agreement between the compared results was very satisfactory showing the ability of the SAS model to predict both narrowband and broadband noise.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".