Time-Accurate Flow Simulations Past Helicopter Rotors in Hover and Forward Flight Conditions Using Chimera Grid Technique
Bibliographic record
Abstract
A study of time-accurate flow simulations past a two-bladed helicopter rotor was performed for hover and forward flight conditions, assuming inviscid compressible flow. The study was focused on the validation of the commercial CFD-FASTRAN solver for helicopter flow simulations using a moving Chimera grid technique. The flow field consisted of structured multi-block overlapped grids. For validation, the well-known wind tunnel model of the Caradonna and Tung two-blade rotor was considered. Two rotor flow configurations were studied. The first one concerned a lifting rotor in hover at two rotational speeds. The lower rotational speed produced a subsonic flow over the blades; however, the higher rotational speed induced a strong shock wave near the blade tips. The second configuration corresponded to a non-lifting rotor in forward flight in which a shock wave was present on the blade-tip region on the advancing side of the rotor. For the two rotor flow configurations, the numerical results showed that the locations of the shock waves were fairly well predicted and the pressure coefficient comparisons with the available CFD and experimental data showed very good agreement.
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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) | 0.000 | 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".