{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:N5INQWLV6LXUPE533RBTBIRKLM","short_pith_number":"pith:N5INQWLV","canonical_record":{"source":{"id":"1803.07316","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-20T09:18:16Z","cross_cats_sorted":[],"title_canon_sha256":"2dcf447654dcdfa528952a4c1d51bafe5e142d75e86cf909252dba87e53b1b63","abstract_canon_sha256":"0786b9368521053667e7aafbbb47124bf59f4237908a4028e66872e0752833bf"},"schema_version":"1.0"},"canonical_sha256":"6f50d85975f2ef4793bbdc4330a22a5b2de7b5a6368d58ac5715c4e4b0d68a89","source":{"kind":"arxiv","id":"1803.07316","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07316","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07316v1","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07316","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"pith_short_12","alias_value":"N5INQWLV6LXU","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N5INQWLV6LXUPE53","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N5INQWLV","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:N5INQWLV6LXUPE533RBTBIRKLM","target":"record","payload":{"canonical_record":{"source":{"id":"1803.07316","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-20T09:18:16Z","cross_cats_sorted":[],"title_canon_sha256":"2dcf447654dcdfa528952a4c1d51bafe5e142d75e86cf909252dba87e53b1b63","abstract_canon_sha256":"0786b9368521053667e7aafbbb47124bf59f4237908a4028e66872e0752833bf"},"schema_version":"1.0"},"canonical_sha256":"6f50d85975f2ef4793bbdc4330a22a5b2de7b5a6368d58ac5715c4e4b0d68a89","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:20:33.653417Z","signature_b64":"dNJjIgfwNE52q6XKjM69iHcbUxAIHNE1guE0CvYye0VbIwrQDOnD8Bv4aQThUY2gWhJBifq6Uz48nNv4or9pDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f50d85975f2ef4793bbdc4330a22a5b2de7b5a6368d58ac5715c4e4b0d68a89","last_reissued_at":"2026-05-18T00:20:33.652684Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:20:33.652684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.07316","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":"2026-05-18T00:20:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IRrwM4oGc07RMn4B50rIs2icJWahZyBwMZwWFitWurtWQHGOmiLNh+0oAdxNBnDXgqFC1t6S5lu8zCTOFR62Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T01:30:32.288615Z"},"content_sha256":"b97226f7ae617420ccfb1c9febd503065bfd93ca1279b7b58bacf881a5cf275f","schema_version":"1.0","event_id":"sha256:b97226f7ae617420ccfb1c9febd503065bfd93ca1279b7b58bacf881a5cf275f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:N5INQWLV6LXUPE533RBTBIRKLM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Numerical simulation of vortex-induced drag of elastic swimmer models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"D. Kolomenskiy, J. Sesterhenn, K. Schneider, T. Engels","submitted_at":"2018-03-20T09:18:16Z","abstract_excerpt":"We present numerical simulations of simplified models for swimming organisms or robots, using chordwise flexible elastic plates. We focus on the tip vortices originating from three-dimensional effects due to the finite span of the plate. These effects play an important role when predicting the swimmer's cruising velocity, since they contribute significantly to the drag force. First we simulate swimmers with rectangular plates of different aspect ratio and compare the results with a recent experimental study. Then we consider plates with expanding and contracting shapes. We find the cruising ve"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07316","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":""},"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":"2026-05-18T00:20:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w7euMON2tfNQkDimgSqMEmZnJf91iGBHrjIRD7vNvPVbDHGF6y3GCfKReG1GZDUM1+RZzNHEiDpNCp0TH15HAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T01:30:32.288958Z"},"content_sha256":"b8d1177cafae40d4d8019ebcd60b21b52c38ed21e320a809ac9c85fe1689e1e2","schema_version":"1.0","event_id":"sha256:b8d1177cafae40d4d8019ebcd60b21b52c38ed21e320a809ac9c85fe1689e1e2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N5INQWLV6LXUPE533RBTBIRKLM/bundle.json","state_url":"https://pith.science/pith/N5INQWLV6LXUPE533RBTBIRKLM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N5INQWLV6LXUPE533RBTBIRKLM/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":"2026-06-24T01:30:32Z","links":{"resolver":"https://pith.science/pith/N5INQWLV6LXUPE533RBTBIRKLM","bundle":"https://pith.science/pith/N5INQWLV6LXUPE533RBTBIRKLM/bundle.json","state":"https://pith.science/pith/N5INQWLV6LXUPE533RBTBIRKLM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N5INQWLV6LXUPE533RBTBIRKLM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:N5INQWLV6LXUPE533RBTBIRKLM","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":"0786b9368521053667e7aafbbb47124bf59f4237908a4028e66872e0752833bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-20T09:18:16Z","title_canon_sha256":"2dcf447654dcdfa528952a4c1d51bafe5e142d75e86cf909252dba87e53b1b63"},"schema_version":"1.0","source":{"id":"1803.07316","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07316","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07316v1","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07316","created_at":"2026-05-18T00:20:33Z"},{"alias_kind":"pith_short_12","alias_value":"N5INQWLV6LXU","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N5INQWLV6LXUPE53","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N5INQWLV","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:b8d1177cafae40d4d8019ebcd60b21b52c38ed21e320a809ac9c85fe1689e1e2","target":"graph","created_at":"2026-05-18T00:20:33Z","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"},"paper":{"abstract_excerpt":"We present numerical simulations of simplified models for swimming organisms or robots, using chordwise flexible elastic plates. We focus on the tip vortices originating from three-dimensional effects due to the finite span of the plate. These effects play an important role when predicting the swimmer's cruising velocity, since they contribute significantly to the drag force. First we simulate swimmers with rectangular plates of different aspect ratio and compare the results with a recent experimental study. Then we consider plates with expanding and contracting shapes. We find the cruising ve","authors_text":"D. Kolomenskiy, J. Sesterhenn, K. Schneider, T. Engels","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-20T09:18:16Z","title":"Numerical simulation of vortex-induced drag of elastic swimmer models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07316","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:b97226f7ae617420ccfb1c9febd503065bfd93ca1279b7b58bacf881a5cf275f","target":"record","created_at":"2026-05-18T00:20:33Z","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":"0786b9368521053667e7aafbbb47124bf59f4237908a4028e66872e0752833bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-20T09:18:16Z","title_canon_sha256":"2dcf447654dcdfa528952a4c1d51bafe5e142d75e86cf909252dba87e53b1b63"},"schema_version":"1.0","source":{"id":"1803.07316","kind":"arxiv","version":1}},"canonical_sha256":"6f50d85975f2ef4793bbdc4330a22a5b2de7b5a6368d58ac5715c4e4b0d68a89","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6f50d85975f2ef4793bbdc4330a22a5b2de7b5a6368d58ac5715c4e4b0d68a89","first_computed_at":"2026-05-18T00:20:33.652684Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:33.652684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dNJjIgfwNE52q6XKjM69iHcbUxAIHNE1guE0CvYye0VbIwrQDOnD8Bv4aQThUY2gWhJBifq6Uz48nNv4or9pDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:33.653417Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.07316","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b97226f7ae617420ccfb1c9febd503065bfd93ca1279b7b58bacf881a5cf275f","sha256:b8d1177cafae40d4d8019ebcd60b21b52c38ed21e320a809ac9c85fe1689e1e2"],"state_sha256":"33f71e82fce3accd3076285ecf4630846fcda2360e0b71ad5817130695a8239d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0GT5J8HmdKNRd4xCz9Wr7dYkWf1kuDz3mK/l5fLDB6i70DS2811H2ykBa/azrSCyZ+uHvEcAkarPmJL1AUXcBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T01:30:32.290918Z","bundle_sha256":"ae70005c1390ae6539acd5e178e4627fe1592243ae8e41a4ca12f82c8772a9ca"}}