{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:IVRWYS5D5GDZYPMJSE6PD2UEFM","short_pith_number":"pith:IVRWYS5D","canonical_record":{"source":{"id":"1701.04233","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-16T10:48:49Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"fad674baf3d268f39968b4f346a190b0bb55110bea9e1335b408d0a839be2432","abstract_canon_sha256":"71ee69a33b0c06733103825f869ab4b578cb27dd0cc848977344caf8651cd6cd"},"schema_version":"1.0"},"canonical_sha256":"45636c4ba3e9879c3d89913cf1ea842b2f53c1bdab937546255a78bda6d8f06c","source":{"kind":"arxiv","id":"1701.04233","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.04233","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"arxiv_version","alias_value":"1701.04233v2","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.04233","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"pith_short_12","alias_value":"IVRWYS5D5GDZ","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"IVRWYS5D5GDZYPMJ","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"IVRWYS5D","created_at":"2026-05-18T12:31:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:IVRWYS5D5GDZYPMJSE6PD2UEFM","target":"record","payload":{"canonical_record":{"source":{"id":"1701.04233","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-16T10:48:49Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"fad674baf3d268f39968b4f346a190b0bb55110bea9e1335b408d0a839be2432","abstract_canon_sha256":"71ee69a33b0c06733103825f869ab4b578cb27dd0cc848977344caf8651cd6cd"},"schema_version":"1.0"},"canonical_sha256":"45636c4ba3e9879c3d89913cf1ea842b2f53c1bdab937546255a78bda6d8f06c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:29:21.021623Z","signature_b64":"Uk6yA19uoQFaennRjgQhb0+XV9GMMPiC44YeuZ1MhPMRIKFCqBCpOU+JPdrbiAQG+kEkTEzzRwOif7iUf8C/Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"45636c4ba3e9879c3d89913cf1ea842b2f53c1bdab937546255a78bda6d8f06c","last_reissued_at":"2026-05-18T00:29:21.020906Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:29:21.020906Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.04233","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:29:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Do9uOMnK0h+JeVOioU8+YRV3qRbMrOCJ94d2ywAl+AMfNGzwcIDzEiTtti4/vtaJq+yXSfwyc4usfw9P4qGfDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:55:34.615024Z"},"content_sha256":"82711d30402f4995d354aa2e8c36f4de0e8f1e96a16daa019beae9f67c28d9d2","schema_version":"1.0","event_id":"sha256:82711d30402f4995d354aa2e8c36f4de0e8f1e96a16daa019beae9f67c28d9d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:IVRWYS5D5GDZYPMJSE6PD2UEFM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Thickening of viscoelastic flow in a model porous medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn"],"primary_cat":"cond-mat.soft","authors_text":"A. Clarke, E. J. Hemingway, J. R. A. Pearson, S. M. Fielding","submitted_at":"2017-01-16T10:48:49Z","abstract_excerpt":"We study numerically two-dimensional creeping viscoelastic flow past a biperiodic square array of cylinders within the Oldroyd B, FENE-CR and FENE-P constitutive models of dilute polymer solutions. Our results capture the initial mild decrease then dramatic upturn ('thickening') seen experimentally in the drag coefficient as a function of increasing Weissenberg number. By systematically varying the porosity of the flow geometry, we demonstrate two qualitatively different mechanisms underpinning this thickening effect: one that operates in the highly porous case of widely spaced obstacles, and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.04233","kind":"arxiv","version":2},"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":"2026-05-18T00:29:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2wg+obkRsbmLhcW10xIrA2yaXAPz+T+jvmQDFFIhIU6ujs/nxar6mH9rbGxgdl7rzQ0lwg9WIx/P9Ir4B6jhDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:55:34.615380Z"},"content_sha256":"88b3d4e2bedf5b9e85c2f31d098f213887a7ec9d2210f05337a1091754de8b65","schema_version":"1.0","event_id":"sha256:88b3d4e2bedf5b9e85c2f31d098f213887a7ec9d2210f05337a1091754de8b65"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/bundle.json","state_url":"https://pith.science/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/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":"2026-06-08T14:55:34Z","links":{"resolver":"https://pith.science/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM","bundle":"https://pith.science/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/bundle.json","state":"https://pith.science/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IVRWYS5D5GDZYPMJSE6PD2UEFM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:IVRWYS5D5GDZYPMJSE6PD2UEFM","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":"71ee69a33b0c06733103825f869ab4b578cb27dd0cc848977344caf8651cd6cd","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-16T10:48:49Z","title_canon_sha256":"fad674baf3d268f39968b4f346a190b0bb55110bea9e1335b408d0a839be2432"},"schema_version":"1.0","source":{"id":"1701.04233","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.04233","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"arxiv_version","alias_value":"1701.04233v2","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.04233","created_at":"2026-05-18T00:29:21Z"},{"alias_kind":"pith_short_12","alias_value":"IVRWYS5D5GDZ","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"IVRWYS5D5GDZYPMJ","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"IVRWYS5D","created_at":"2026-05-18T12:31:21Z"}],"graph_snapshots":[{"event_id":"sha256:88b3d4e2bedf5b9e85c2f31d098f213887a7ec9d2210f05337a1091754de8b65","target":"graph","created_at":"2026-05-18T00:29:21Z","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 study numerically two-dimensional creeping viscoelastic flow past a biperiodic square array of cylinders within the Oldroyd B, FENE-CR and FENE-P constitutive models of dilute polymer solutions. Our results capture the initial mild decrease then dramatic upturn ('thickening') seen experimentally in the drag coefficient as a function of increasing Weissenberg number. By systematically varying the porosity of the flow geometry, we demonstrate two qualitatively different mechanisms underpinning this thickening effect: one that operates in the highly porous case of widely spaced obstacles, and ","authors_text":"A. Clarke, E. J. Hemingway, J. R. A. Pearson, S. M. Fielding","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-16T10:48:49Z","title":"Thickening of viscoelastic flow in a model porous medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.04233","kind":"arxiv","version":2},"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":"sha256:82711d30402f4995d354aa2e8c36f4de0e8f1e96a16daa019beae9f67c28d9d2","target":"record","created_at":"2026-05-18T00:29:21Z","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":"71ee69a33b0c06733103825f869ab4b578cb27dd0cc848977344caf8651cd6cd","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2017-01-16T10:48:49Z","title_canon_sha256":"fad674baf3d268f39968b4f346a190b0bb55110bea9e1335b408d0a839be2432"},"schema_version":"1.0","source":{"id":"1701.04233","kind":"arxiv","version":2}},"canonical_sha256":"45636c4ba3e9879c3d89913cf1ea842b2f53c1bdab937546255a78bda6d8f06c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"45636c4ba3e9879c3d89913cf1ea842b2f53c1bdab937546255a78bda6d8f06c","first_computed_at":"2026-05-18T00:29:21.020906Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:29:21.020906Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Uk6yA19uoQFaennRjgQhb0+XV9GMMPiC44YeuZ1MhPMRIKFCqBCpOU+JPdrbiAQG+kEkTEzzRwOif7iUf8C/Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:29:21.021623Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.04233","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:82711d30402f4995d354aa2e8c36f4de0e8f1e96a16daa019beae9f67c28d9d2","sha256:88b3d4e2bedf5b9e85c2f31d098f213887a7ec9d2210f05337a1091754de8b65"],"state_sha256":"4f993764852b464221d5c5879215d4e083a987787d1b149a64e7e84c8967e8ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dSUbEuKfKMMvD/TKfdC0LsZXI/j4+x+S9pJ2vYf7MWEjHY25uvsop05xnq73IGqIj5m5LnSiHHiqavitFWMoCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T14:55:34.617244Z","bundle_sha256":"0e8a3b7ec3fade815487a050236a651f59cc957e72c5a50acc1032812c696723"}}