granular op• Data kinds: scalar × scalar × scalar → scalar
• Call: import fullseye as fs; fs.ledger.beverloo_rate(D0: 'float', d: 'float', bulk_density: 'float', C: 'float' = 0.58, k: 'float' = 1.4, g: 'float' = 9.80665) -> 'float' (to call the implementation directly, import granular; granular.beverloo_rate(D0: 'float', d: 'float', bulk_density: 'float', C: 'float' = 0.58, k: 'float' = 1.4, g: 'float' = 9.80665) -> 'float'; from the registry, opsdrive.get("beverloo_rate"))
Beverloo's discharge law W = C ρ_b √g (D₀ − k d)^{5/2} [kg/s] (Beverloo et al. 1961; coefficients C ≈ 0.58, k ≈ 1.4 as compiled by Nedderman 1992). D0 = diameter of the circular orifice [m], d = particle size [m], bulk_density = bulk density.
> The detailed description below is the original text — the summary and the headings are translated.
Raises ValueError: D0 ≤ k d(有効開口が無い。式は負の底を 5/2 乗できないし、現実には詰まる)/ いずれかが ≤ 0 / 非有限。D0/d < 6 程度では間欠流・詰まりが起きる(式の適用外)が、それはここでは拒否せず、返りの検査は呼び手に委ねる(閾は材料依存)。
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_granular_heap_repose — py -3.11 examples/poc_granular_heap_repose.py
• poc_powder_scoop_pour — py -3.11 examples/poc_powder_scoop_pour.py
scalar as input)spin_from_marker_sequence · carla_transform_matrix · carla_pose_to_world · carla_camera_pose · carla_xy_yaw · carla_scene_load · town_chain · osm_parse
granular)heap_volume_cone · heap_mass · heap_volume_heightmap · beverloo_fit · discharge_synth · dispense_mass_from_video · hopper_discharge_rate · spoon_tilt_critical
*Provenance: granular.py — DRIVE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.