Vortex-induced response of a long flexible marine riser in a shear current
Bibliographic record
Abstract
The response of a long flexible marine riser in a shear current is investigated using a lumpedmass numerical model. The objective of the model is to provide a simulation tool for assessing the motions and stresses (longitudinal and bending) in a deep-water riser, subject to surface waves and deep-ocean currents. The riser is modelled as a beam of hollow circular section divided into segments. Structural forces are modeled by extensional springs and dampers within the segments and rotational springs and dampers at the joints between the segments. Fluid structure coupling is achieved by application of the hydrodynamic loads via drag, lift and addedmass coefficients using the instantaneous relative velocities and accelerations between the fluid field and the riser segments. The effects of flow and pressure of a fluid within the riser are included in the model. The equations of motion are assembled using Kane's multi-body dynamics method and solved using a robust implementation of the Runge-Kutta method provided in MATLABÔ. The model is implemented to simulate the results observed in various physicalmodel experiments that have been conducted at the National Research Council Canada. Results obtained using experimental data are included in this paper.
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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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".