{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:XSCY2CAWF3M4JKAOHYTVOCE4BS","short_pith_number":"pith:XSCY2CAW","canonical_record":{"source":{"id":"2202.09147","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2022-02-18T11:53:44Z","cross_cats_sorted":[],"title_canon_sha256":"0fbc424fdc32e4b72cb60b99738e67ca937f7c7be3784ff7aea73f427e9afde7","abstract_canon_sha256":"1173db4c7c662347a534e6e1166955f8cd7f753ca1c5b0f5d07a2423a06f5e5a"},"schema_version":"1.0"},"canonical_sha256":"bc858d08162ed9c4a80e3e2757089c0cb73068417c7d67b9cd9c66bd5370fc0e","source":{"kind":"arxiv","id":"2202.09147","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.09147","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"arxiv_version","alias_value":"2202.09147v1","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.09147","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_12","alias_value":"XSCY2CAWF3M4","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_16","alias_value":"XSCY2CAWF3M4JKAO","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_8","alias_value":"XSCY2CAW","created_at":"2026-07-05T08:33:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:XSCY2CAWF3M4JKAOHYTVOCE4BS","target":"record","payload":{"canonical_record":{"source":{"id":"2202.09147","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2022-02-18T11:53:44Z","cross_cats_sorted":[],"title_canon_sha256":"0fbc424fdc32e4b72cb60b99738e67ca937f7c7be3784ff7aea73f427e9afde7","abstract_canon_sha256":"1173db4c7c662347a534e6e1166955f8cd7f753ca1c5b0f5d07a2423a06f5e5a"},"schema_version":"1.0"},"canonical_sha256":"bc858d08162ed9c4a80e3e2757089c0cb73068417c7d67b9cd9c66bd5370fc0e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:33:25.996932Z","signature_b64":"M9H7vLqJDVN4XJawJYYQwWV+0XBje7okWA9RnRGl7ok2Y0sAaywZbAh6wKP9m3Ap4Mmq3Soz/BkJ0Sl8aNMtBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc858d08162ed9c4a80e3e2757089c0cb73068417c7d67b9cd9c66bd5370fc0e","last_reissued_at":"2026-07-05T08:33:25.996512Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:33:25.996512Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2202.09147","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:33:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jSQ4YWR2RxDN2gqk/d0j4NAaOkSDIX6BZJgZVT3sIfI98lWHoLc3kH322mct4/g9ojR1L8FdNcseSKoUnoQsCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T21:17:47.750693Z"},"content_sha256":"9d93d083b09d80c2be3a8ca02301a816f01fe97ae423015c3d11e7ff36c9fed5","schema_version":"1.0","event_id":"sha256:9d93d083b09d80c2be3a8ca02301a816f01fe97ae423015c3d11e7ff36c9fed5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:XSCY2CAWF3M4JKAOHYTVOCE4BS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Morphological effects of leading-edge serrations on the acoustic signatures of mixed flow fan analyzed using novel CFD-informed methods","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Hao Liu, Jinxin Wang, Kenta Ishibashi, Takeo Fujii, Teruaki Ikeda, Toshiyuki Nakata","submitted_at":"2022-02-18T11:53:44Z","abstract_excerpt":"Leading-edge (LE) noise is a common source of broadband noise for fans that can be suppressed using appended LE serrations. We conduct an integrated study of the morphological effects of interval, length, and inclination angle of owl-inspired LE serrations on the aeroacoustic characteristics of a mixed flow fan using experiments, computational fluid dynamics (CFD), and the Ffowcs Williams-Hawkings (FWH) analogy. A novel method for surface noise strength (SNS) visualization was developed based on the FWH analogy with large-eddy simulations, and a CFD-informed index SAPG is proposed to evaluate "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.09147","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2202.09147/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:33:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ambVWwMpQdqIueDliD69T9TFVdaabBfxnBZoxjMetBr7pEU2aCcQ0cIW2anEFjt8KgBiJ4KSnDiNry1KxrLvCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T21:17:47.751065Z"},"content_sha256":"c805d87d04c04cab3c16cd97bd72b477d0d21c99bfafaa6faf9b384f85484545","schema_version":"1.0","event_id":"sha256:c805d87d04c04cab3c16cd97bd72b477d0d21c99bfafaa6faf9b384f85484545"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/bundle.json","state_url":"https://pith.science/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-25T21:17:47Z","links":{"resolver":"https://pith.science/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS","bundle":"https://pith.science/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/bundle.json","state":"https://pith.science/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XSCY2CAWF3M4JKAOHYTVOCE4BS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:XSCY2CAWF3M4JKAOHYTVOCE4BS","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"1173db4c7c662347a534e6e1166955f8cd7f753ca1c5b0f5d07a2423a06f5e5a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2022-02-18T11:53:44Z","title_canon_sha256":"0fbc424fdc32e4b72cb60b99738e67ca937f7c7be3784ff7aea73f427e9afde7"},"schema_version":"1.0","source":{"id":"2202.09147","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.09147","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"arxiv_version","alias_value":"2202.09147v1","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.09147","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_12","alias_value":"XSCY2CAWF3M4","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_16","alias_value":"XSCY2CAWF3M4JKAO","created_at":"2026-07-05T08:33:25Z"},{"alias_kind":"pith_short_8","alias_value":"XSCY2CAW","created_at":"2026-07-05T08:33:25Z"}],"graph_snapshots":[{"event_id":"sha256:c805d87d04c04cab3c16cd97bd72b477d0d21c99bfafaa6faf9b384f85484545","target":"graph","created_at":"2026-07-05T08:33:25Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2202.09147/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Leading-edge (LE) noise is a common source of broadband noise for fans that can be suppressed using appended LE serrations. We conduct an integrated study of the morphological effects of interval, length, and inclination angle of owl-inspired LE serrations on the aeroacoustic characteristics of a mixed flow fan using experiments, computational fluid dynamics (CFD), and the Ffowcs Williams-Hawkings (FWH) analogy. A novel method for surface noise strength (SNS) visualization was developed based on the FWH analogy with large-eddy simulations, and a CFD-informed index SAPG is proposed to evaluate ","authors_text":"Hao Liu, Jinxin Wang, Kenta Ishibashi, Takeo Fujii, Teruaki Ikeda, Toshiyuki Nakata","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2022-02-18T11:53:44Z","title":"Morphological effects of leading-edge serrations on the acoustic signatures of mixed flow fan analyzed using novel CFD-informed methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.09147","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9d93d083b09d80c2be3a8ca02301a816f01fe97ae423015c3d11e7ff36c9fed5","target":"record","created_at":"2026-07-05T08:33:25Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"1173db4c7c662347a534e6e1166955f8cd7f753ca1c5b0f5d07a2423a06f5e5a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2022-02-18T11:53:44Z","title_canon_sha256":"0fbc424fdc32e4b72cb60b99738e67ca937f7c7be3784ff7aea73f427e9afde7"},"schema_version":"1.0","source":{"id":"2202.09147","kind":"arxiv","version":1}},"canonical_sha256":"bc858d08162ed9c4a80e3e2757089c0cb73068417c7d67b9cd9c66bd5370fc0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc858d08162ed9c4a80e3e2757089c0cb73068417c7d67b9cd9c66bd5370fc0e","first_computed_at":"2026-07-05T08:33:25.996512Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:33:25.996512Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M9H7vLqJDVN4XJawJYYQwWV+0XBje7okWA9RnRGl7ok2Y0sAaywZbAh6wKP9m3Ap4Mmq3Soz/BkJ0Sl8aNMtBg==","signature_status":"signed_v1","signed_at":"2026-07-05T08:33:25.996932Z","signed_message":"canonical_sha256_bytes"},"source_id":"2202.09147","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d93d083b09d80c2be3a8ca02301a816f01fe97ae423015c3d11e7ff36c9fed5","sha256:c805d87d04c04cab3c16cd97bd72b477d0d21c99bfafaa6faf9b384f85484545"],"state_sha256":"64f6f3263ea323f11b97b2f68ce5d6f58f4d71c03807e7b861eca498a1a2ac9d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cGf459FV4tF9t1KTKeT1i8FuPLtwl6Nr2/SYKlKfGspdIPfgUp4YMMCRbf2OnvDDOdKMsB8srspTwoL4/R/SBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-25T21:17:47.753184Z","bundle_sha256":"72e3b8ec0baf7cdaf950ce097757e5137b8e7fd0aa3291fe9ad3c1180386bb87"}}