Low-Order Models of the Fluctuating Wall Pressure in an Incompressible Turbulent Impinging Jet
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Bibliographic record
Abstract
The ∞uctuating wall pressure fleld measured simultaneously at 137 points in an impinging jet with ReD = 23;000 and a nozzle-to-plate spacing of two diameters. A previous time averaged azimuthal decomposition 1 indicated that the ∞uctuating pressure fleld could be accurately described using few azimuthal modes, indicating this ∞ow is an excellent candidate for a Low-Order Dynamical Systems (LODS) model. The present model was developed using a method similar as Ricaud, 2 whereby a general cubic order system of equations is flt to the experimentally determined Fourier coe‐cients. A LODS model developed using only azimuthal modes 0, 1 and 2 was able to reasonably accurately capture the behaviour of the ∞uctuating pressure fleld at r=D = 1:5. Downstream at r=D = 2:0, where the pressure fleld is more three-dimensional, the addition of azimuthal mode 3 is required to produce a stable system of equations, that again, reasonably captures the dynamics of the ∞uctuating pressure fleld. The success of this technique here, suggests that it may prove useful in high speed ∞ow control applications where some degree of predictive ability is required.
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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 | 0.001 | 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 it