Vortex-Induced Vibration of a Circular Cylinder With Low Mass Ratio Near a Plane Wall
Bibliographic record
Abstract
Vortex induced vibration of a circular cylinder with low mass ratio in vicinity of a wall boundary is investigated experimentally in a water tunnel facility. Simultaneous measurements of the flow field via planar Particle Image Velocimetry and amplitude response have been carried out across a wide range of reduced velocities and cylinder-wall gap ratios (S* = S/D). For S* ≥ 3, both the amplitude response and the wake development are not significantly affected by the presence of the wall boundary. As S* is decreased below 3, the amplitude response decreases until S* ≈ 0.5, where the cylinder begins to periodically impact the wall. For all S* ≤ 0.5, the cylinder continues to impact the wall in a periodic fashion, and the reduced velocity range over which this occurs increases. Mean field and RMS field statistics revealed strong asymmetric wake development for S* < 3. Proper Orthogonal Decomposition of the velocity data was used to investigate the energy distribution in the coherent wake structures, and to filter the incoherent fluctuations via construction of a Reduced Order Model. Reconstructions of instantaneous vorticity fields obtained from the ROM illustrate the changes in vortex shedding patterns with the cylinder response.
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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 | 0.000 |
| 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 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".