Design and Experimental Verification of an Exit Manifold for Improved Current Generation in an Offshore Engineering Basin
Bibliographic record
Abstract
Current is generated at the National Research Council's Institute for Marine Dynamics, Offshore Engineering Basin (OEB) in St. John's, Newfoundland, using a pump thruster system in which flow is conveyed under a false floor and returns through the test section of basin. The objectives of this project were to quantify and assess the performance of the existing current generation system and to experimentally verify a design exit manifold for improved current generation. At present, current operation results in large-scale vertical vortices being produced at the current exit end of the basin where. the wave boards are installed. The exit flow is not confined and therefore flow divergence occurs at the vertical back wall of the basin. These conditions contribute to substantial energy losses at the exit region, which in turn result in low current velocities at the test region of the basin. Through the use of Computational Fluid Dynamics, preliminary designs for an exit manifold to reverse flow back into the basin were modeled to ensure an efficient system is implemented to dissipate the flow into the basin. The CFD models provided an insight into the shear flow turbulent mixing at the exit region. For operational reasons the design was constrained to a height of 0.35m and a maximum length of approximately 4. 0m. The final detailed design called for a contraction/expansion combination, J 80° turn with exit manifold and flow straighteners. A prototype of the design was fabricated of aluminum and experimental tests were conducted to assess its performance. The results of the experiments showed a significant improvement in current generation capabilities over the present current generation setup. For deep-water tests, the use of the prototype exit manifold resulted in a velocity magnitude increase of two times over the present setup. Shallow water tests resulted in a velocity magnitude increase of greater than three times over the present setup. It is envisaged that the installation of the exit manifold design in the OEB will significantly improve the current generation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".