Self-propulsion CFD simulation of a bulk carrier vessel with and without pre-swirl stators (PSS)
Bibliographic record
Abstract
This study presents the results of a workshop conducted within the JoRes framework, focusing on self-propulsion CFD simulation of the full-scale bulk carrier vessel, JoRes5 GRIP. This vessel serves as an ideal validation case, having undergone sea trials both with and without an Energy-Saving Device (ESD)—specifically, pre-swirl stators (PSS). The sea trials were performed at comparable draught conditions (TM = 7.7 m) and across multiple speeds, providing a robust comparative dataset. The vessel, with a length between perpendiculars (LPP) of 182 m, was tested at speeds of 13.65, 15.25, 16.02, and 16.32 kn. These conditions were replicated in the CFD simulations conducted during the workshop, providing insights into the influence of PSS on propulsion performance and enabling validation against full-scale measurement.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".