Radiation and Absorbing Boundary Conditions for the Lattice Boltzmann Method
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Bibliographic record
Abstract
The Lattice Boltzmann Method (LBM) is a well established computational tool for fluid flow simulations. This method has been utilized for low Mach number Computational Aeroacoustics (CAA). Robust and nonreflective boundary conditions, similar to those used in Navier-Stokes solvers, are needed for LBM-based CAA. One challenge is that proper boundary conditions be specified in terms of the particle distribution function rather than the usual hydrodynamic properties. The focus of the present study was to develop radiation boundary conditions and perfectly matched layers (PML) for LBM. Such boundary conditions were formulated and tested using benchmark acoustic problems. The perfectly matched layer concept appears to be very well suited for LBM, and yielded very low acoustic reflection factor.
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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 | 0.001 | 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 | 0.004 | 0.000 |
| Scholarly communication | 0.001 | 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 it