Fully developed building unit cavity source for long multiple shallow cavity configurations
Bibliographic record
Abstract
Fluid resonant oscillations have been reported for corrugated pipes installed in offshore gas and oil fields. Corrugated pipes can be modelled as a series of consecutive shallow cavities. The current study investigates the development of the individual cavity source along multiple-cavity arrangements and whether this source eventually reaches a fully developed form with a persistent source contribution. Such a contribution defines a proposed building unit cavity source. To achieve this objective, the aeroacoustic source of a test section with a gradually increasing number of cavities is measured by means of the standing wave method. The individual cavity source is found to asymptotically reach a constant value starting from the fourth cavity. This source value is a function of the excitation level and eventually decays at a high excitation level of 10%. The measured building unit source is validated by two different approaches. First, a prediction model is developed for a twelve-cavity configuration based on the building unit source. Fair agreement is found between the predicted and the experimentally measured pressure amplitudes. The second validation approach involves extracting the source of the ninth cavity in a twelve-cavity configuration using Howe’s analogy based on particle image velocimetry measurements. The ninth cavity source fairly matches the building unit source for excitation levels higher than 1%. For lower excitation levels, three-dimensional flow effects are found to become more dominant and lead to larger discrepancies with the unit source.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".