Large eddy simulation of the turbulent multiphase flow on sandstone wastewater of hydropower stations in a vortex-type grit chamber
Bibliographic record
Abstract
Vortex-type grit chambers are commonly used for the treatment of high-turbidity sandstone wastewater in hydropower stations. Current researches on vortex-type grit chambers mainly focus on the optimization of the engineering operation parameters. Although there have been many studies on sandstone wastewater simulations in stirred tanks or hydrocyclones predicted by Reynolds-averaged Navier–Stokes, there are few reports on the large eddy simulation (LES) based prediction of the multiphase flows in a vortex-type grit chamber. The rigid-lid approximation is commonly used for free surface movement. The LES can reveal more detailed pulsation features. The volume of fluid (VOF) method can describe the interfacial turbulence characteristics for free surface movement. Thus, the VOF method was used as a surface tracking technique along with LES–Lagrangian model to study the characteristics of gas–liquid–solid multiphase flows. The flow field distributions were analyzed and the micro movement regularities of particles were discussed.
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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 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".