Effects of wavy sidewall on vortex breakdown in an enclosed cylindrical chamber with a rotating end wall
Bibliographic record
Abstract
The effects of the wavy sidewall on flow behavior in an enclosed cylindrical chamber with a rotating end wall were investigated by a numerical model based on the steady, axisymmetric Navier–Stokes equations. The wavy sidewall influences vortex breakdown by either enhancing or reducing the swirling velocity near the top axis, depending on its orientation, amplitude, and period. When the period is small, the orientation of the wavy sidewall varies the volume of the top region of the chamber, which affects the swirling velocity there, thus influencing the occurrence of vortex breakdown. The volume-variation effect is enhanced with an increase in the amplitude, while reduced with an increase in the period. Moreover, an increase in the amplitude or period increases the length of the wavy sidewall, which enhances the dissipation of the fluid angular momentum along it. Thus, the swirling velocity near the top axis region is decreased and vortex breakdown is delayed. The resultant effect of the wavy sidewall is determined by the competition/cooperation of the volume-variation effect and the dissipation effect. However, if the period is large, the dissipation effect becomes dominant and the orientation of the wavy sidewall becomes unimportant.
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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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".