{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:BCM22G3MH5NKO57YEOYN5Q7PZR","short_pith_number":"pith:BCM22G3M","canonical_record":{"source":{"id":"2505.21946","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.GR","submitted_at":"2025-05-28T03:56:38Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"82d55b72cd06ee993b8a163e41eb477ae97d23aa5d0c46958ef0c987437d4fc5","abstract_canon_sha256":"d4b5b102e32ac54d5a5f488d0020916dfb44774a172e7bb86254179aaca939c3"},"schema_version":"1.0"},"canonical_sha256":"0899ad1b6c3f5aa777f823b0dec3efcc682dbcf935a0570516cd1aabd131b8a5","source":{"kind":"arxiv","id":"2505.21946","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.21946","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"arxiv_version","alias_value":"2505.21946v1","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.21946","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_12","alias_value":"BCM22G3MH5NK","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_16","alias_value":"BCM22G3MH5NKO57Y","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_8","alias_value":"BCM22G3M","created_at":"2026-07-05T11:11:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:BCM22G3MH5NKO57YEOYN5Q7PZR","target":"record","payload":{"canonical_record":{"source":{"id":"2505.21946","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.GR","submitted_at":"2025-05-28T03:56:38Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"82d55b72cd06ee993b8a163e41eb477ae97d23aa5d0c46958ef0c987437d4fc5","abstract_canon_sha256":"d4b5b102e32ac54d5a5f488d0020916dfb44774a172e7bb86254179aaca939c3"},"schema_version":"1.0"},"canonical_sha256":"0899ad1b6c3f5aa777f823b0dec3efcc682dbcf935a0570516cd1aabd131b8a5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:11:06.496263Z","signature_b64":"09ibrjlIDbuRr9NltTPwN2oHFgWgbocoFWFmciv98N7EjtFmymi/LGtKcznMebktIRuVvPfZWidtxZYBGsSgCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0899ad1b6c3f5aa777f823b0dec3efcc682dbcf935a0570516cd1aabd131b8a5","last_reissued_at":"2026-07-05T11:11:06.495771Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:11:06.495771Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.21946","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":"2026-07-05T11:11:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u3B5AcPkTRwJoFbVzPDyPQA+l8XzQTKaSaC67oCIzAEQEW73l0Wg//PsOreB5KSbu5RYbpMpKlfqLD8X5Q9eBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T17:39:26.288963Z"},"content_sha256":"66076809928f37ca59e3378eab519430ac424cbca43b5657d33d787570399c9d","schema_version":"1.0","event_id":"sha256:66076809928f37ca59e3378eab519430ac424cbca43b5657d33d787570399c9d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:BCM22G3MH5NKO57YEOYN5Q7PZR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fluid Simulation on Vortex Particle Flow Maps","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.flu-dyn"],"primary_cat":"cs.GR","authors_text":"Bo Zhu, Duowen Chen, Fan Feng, Greg Turk, Junwei Zhou, Sinan Wang, Yuchen Sun, Zhiqi Li","submitted_at":"2025-05-28T03:56:38Z","abstract_excerpt":"We propose the Vortex Particle Flow Map (VPFM) method to simulate incompressible flow with complex vortical evolution in the presence of dynamic solid boundaries. The core insight of our approach is that vorticity is an ideal quantity for evolution on particle flow maps, enabling significantly longer flow map distances compared to other fluid quantities like velocity or impulse. To achieve this goal, we developed a hybrid Eulerian-Lagrangian representation that evolves vorticity and flow map quantities on vortex particles, while reconstructing velocity on a background grid. The method integrat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.21946","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/2505.21946/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":"2026-07-05T11:11:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MuUmEwte0p7dPHH7uNN8s3LVAIeLDfyNTqpPYH+Yf5DeoRpUeEqNzG4Q/dubRWoKzrjO9TI+LBowhmBZBPRFDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T17:39:26.289482Z"},"content_sha256":"f0a8aa2b8f411b0385c4fa23dc14bdd47ce9c07522147422ad2a35359b5c27b2","schema_version":"1.0","event_id":"sha256:f0a8aa2b8f411b0385c4fa23dc14bdd47ce9c07522147422ad2a35359b5c27b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/bundle.json","state_url":"https://pith.science/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/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":"2026-08-08T17:39:26Z","links":{"resolver":"https://pith.science/pith/BCM22G3MH5NKO57YEOYN5Q7PZR","bundle":"https://pith.science/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/bundle.json","state":"https://pith.science/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BCM22G3MH5NKO57YEOYN5Q7PZR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:BCM22G3MH5NKO57YEOYN5Q7PZR","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":"d4b5b102e32ac54d5a5f488d0020916dfb44774a172e7bb86254179aaca939c3","cross_cats_sorted":["physics.flu-dyn"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.GR","submitted_at":"2025-05-28T03:56:38Z","title_canon_sha256":"82d55b72cd06ee993b8a163e41eb477ae97d23aa5d0c46958ef0c987437d4fc5"},"schema_version":"1.0","source":{"id":"2505.21946","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.21946","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"arxiv_version","alias_value":"2505.21946v1","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.21946","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_12","alias_value":"BCM22G3MH5NK","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_16","alias_value":"BCM22G3MH5NKO57Y","created_at":"2026-07-05T11:11:06Z"},{"alias_kind":"pith_short_8","alias_value":"BCM22G3M","created_at":"2026-07-05T11:11:06Z"}],"graph_snapshots":[{"event_id":"sha256:f0a8aa2b8f411b0385c4fa23dc14bdd47ce9c07522147422ad2a35359b5c27b2","target":"graph","created_at":"2026-07-05T11:11:06Z","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/2505.21946/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose the Vortex Particle Flow Map (VPFM) method to simulate incompressible flow with complex vortical evolution in the presence of dynamic solid boundaries. The core insight of our approach is that vorticity is an ideal quantity for evolution on particle flow maps, enabling significantly longer flow map distances compared to other fluid quantities like velocity or impulse. To achieve this goal, we developed a hybrid Eulerian-Lagrangian representation that evolves vorticity and flow map quantities on vortex particles, while reconstructing velocity on a background grid. The method integrat","authors_text":"Bo Zhu, Duowen Chen, Fan Feng, Greg Turk, Junwei Zhou, Sinan Wang, Yuchen Sun, Zhiqi Li","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.GR","submitted_at":"2025-05-28T03:56:38Z","title":"Fluid Simulation on Vortex Particle Flow Maps"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.21946","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":"sha256:66076809928f37ca59e3378eab519430ac424cbca43b5657d33d787570399c9d","target":"record","created_at":"2026-07-05T11:11:06Z","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":"d4b5b102e32ac54d5a5f488d0020916dfb44774a172e7bb86254179aaca939c3","cross_cats_sorted":["physics.flu-dyn"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.GR","submitted_at":"2025-05-28T03:56:38Z","title_canon_sha256":"82d55b72cd06ee993b8a163e41eb477ae97d23aa5d0c46958ef0c987437d4fc5"},"schema_version":"1.0","source":{"id":"2505.21946","kind":"arxiv","version":1}},"canonical_sha256":"0899ad1b6c3f5aa777f823b0dec3efcc682dbcf935a0570516cd1aabd131b8a5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0899ad1b6c3f5aa777f823b0dec3efcc682dbcf935a0570516cd1aabd131b8a5","first_computed_at":"2026-07-05T11:11:06.495771Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:11:06.495771Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"09ibrjlIDbuRr9NltTPwN2oHFgWgbocoFWFmciv98N7EjtFmymi/LGtKcznMebktIRuVvPfZWidtxZYBGsSgCg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:11:06.496263Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.21946","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:66076809928f37ca59e3378eab519430ac424cbca43b5657d33d787570399c9d","sha256:f0a8aa2b8f411b0385c4fa23dc14bdd47ce9c07522147422ad2a35359b5c27b2"],"state_sha256":"07130c78e5cf234e2dbaab10b29bfd06cb99b97c5ccf9c62b122d872d179706a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JoEEiu0m43QfaRkm4IyEkq9IU/fcHdZrqC0QtY9xbEOrkoPgRNFC7IpciGJfr6I/nWTPMrP9M6LgLbODyg47Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T17:39:26.293413Z","bundle_sha256":"0e15b006ac51075bfac68009911cdbb556d083ad1c957bd4dbdda37c73a43657"}}