First results of numerical simulations of bergy bit collisions with the CCGS Terry Fox icebreaker
Bibliographic record
Abstract
Numerical simulations of a collision between the CCGS Terry Fox icebreaker and a bergy bit (1911 t glacial ice mass) have been conducted using LS-DynaTM software, which incorporates a full Navier-Stokes solver for the fluid component. First results compared favorably with actual data acquired during field tests in June, 2001. The simulations were run on a Beowulf cluster consisting of 15 high-performance CPU's. The modeled volume, including the vessel, water and bergy bit, was meshed using AnsysTM software and contained approximately one million elements. A prior set of non-impact simulations of a model tanker transiting in proximity to model bergy bits showed that at least this number of elements was required. In the results presented here the vessel was traveling at 5 m/s and the impact occurred on the port side of the hull, in the region where the instruments were located during the field tests. A hard crushable foam material model was used for the bergy bit in order to model previously observed ice behavior where the ice contact interface consists of a relatively intact hard zone of ice surrounded by softer pulverized ice. The simulation produced reasonable values for the load, pressure and impact duration values obtained in the field.
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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) | 0.001 | 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 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".