Pith Number

pith:V6SJKTEG

pith:2025:V6SJKTEGDM7DEKTSWKW3GJLOSV

not attested not anchored not stored refs resolved

Noise dissipation mechanisms of an acoustic liner under grazing flow

Angelo Paduano, Francesco Avallone, Francesco Scarano

Grazing flow over an acoustic liner creates a quasi-steady vortex that confines acoustic-induced flow to the downstream half of the orifice and makes vortex shedding phase-dependent.

arxiv:2512.09587 v2 · 2025-12-10 · physics.flu-dyn

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{V6SJKTEGDM7DEKTSWKW3GJLOSV}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The introduction of a grazing flow alters the flow topology; in particular, the shear layer past the orifice generates a quasi-steady vortex that confines the acoustic-induced flow to the downstream half of the orifice. This topological change alters the two noise dissipation mechanisms: viscous losses increase at low SPL because the grazing flow pushes the fluid toward the downstream lip of the orifice; vortex shedding becomes phase dependent, dissipating acoustic energy during the inflow phase and generating acoustic energy during the outflow phase.

C2weakest assumption

That the lattice-Boltzmann very-large-eddy simulation accurately captures both the viscous losses inside the orifice shear layers and the quantitative energy exchange via vortex shedding (via Howe's corollary) without significant numerical dissipation or missing sub-grid effects at the reported Mach 0.3 and SPL range.

C3one line summary

Grazing flow reduces net acoustic dissipation in liners by confining flow via a quasi-steady vortex, increasing low-SPL viscous losses, and making vortex shedding phase-dependent so it generates energy on outflow.

References

3 extracted · 3 resolved · 0 Pith anchors

[1] & Casalino, D.2019 Lattice-Boltzmann Very Large Eddy Simulation of a Multi-Orifice Acoustic Liner with Turbulent Grazing Flow 2019

[2] Title and Subtitle visual study of the effect of grazing flow on the oscillatory flow in a resonator orifice . Bonomo, Lucas A, Quintino, Nicolas T, Cordioli, Julio A, Avallone, Francesco, Jones, Mich 2017

[3] Mallat, Stephane G1989 A Theory for Multiresolution Signal Decomposition: The Wavelet Representation 2018 · doi:10.2514/1.j065204

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:00.559077Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

afa4954c861b3e322a72b2adb3256e9550fb192c2238b9c21d316f3053b3e5c6

Aliases

arxiv: 2512.09587 · arxiv_version: 2512.09587v2 · doi: 10.48550/arxiv.2512.09587 · pith_short_12: V6SJKTEGDM7D · pith_short_16: V6SJKTEGDM7DEKTS · pith_short_8: V6SJKTEG

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/V6SJKTEGDM7DEKTSWKW3GJLOSV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: afa4954c861b3e322a72b2adb3256e9550fb192c2238b9c21d316f3053b3e5c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "df51d8839cb410c838cc8bd4c6fd7bb9ed190d158d7ff75e1be5908a5abe57cd",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.flu-dyn",
    "submitted_at": "2025-12-10T12:24:01Z",
    "title_canon_sha256": "808d94ebdffb4cba1258f9df3ac86d010340d6967988fa6ddcd7d7e38df42b49"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2512.09587",
    "kind": "arxiv",
    "version": 2
  }
}