Bow Shock Free-Stream Disturbance Effects Using a Transformed 1D Shock Layer Approach
Bibliographic record
Abstract
The behavior, shape, and strength of bow shocks have a major effect on downstream aerodynamics, heat transfer, and turbulence. The interaction of these shock waves with freestream disturbances has important implications for intrusive diagnostic techniques as well as for the study of turbulence and transition. This work aims to examine the behavior of blunt body bow shocks subjected to freestream disturbances using a numerical one-dimensional model for the Euler equations along a stagnation line. A one-dimensional shock-fitted finite difference approach has been derived and implemented. This model dynamically calculates the standoff distance of the shock and simulates the behavior of the disturbances between the bow shock and the stagnation point of an axisymmetric geometry. An important consideration of this approach is the treatment of the circumferential velocity derivative. Axisymmetric computational fluid dynamics simulations using OpenFOAM are utilized to study this parameter. Using the developed one-dimensional model, transfer functions between freestream disturbances and post-shock fluctuations are computed and compared to theory and measurements. Results show similar behavior to those in the literature but predict different frequencies and do not replicate decay of the frequency response with higher frequency.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".