Wideband fast multipole boundary element method for flow-induced noise analysis based on Lighthill's equation
Bibliographic record
Abstract
In order to reduce the computational load for the analysis of three-dimensional flow-induced noise based on the Lighthill equation using the boundary element method (BEM), an efficient method is developed on the basis of the fast multipole BEM (FMBEM). The common hierarchical cell structure for grouping boundary element nodes, sound-receiving points and flow-induced noise sources is used; this enables coefficients of the FMBEM to be reused during the calculation of sound pressure at boundary element nodes and receiving points, thereby further accelerating the analysis. In addition, to deal with the increasing hierarchical level for encompassing flow-induced noise sources, which are often widely distributed around the object to be analyzed, a wideband version of the FMBEM is applied. Following the computational procedure, two application examples are presented for discussion. First, noise from a cylinder located in a flow is analyzed to discuss the accuracy of the method. Then, a problem with large number of degrees-of-freedom and flow-induced noise sources is analyzed to demonstrate its applicability to large-scale problems.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| 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".