{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:43H6VSIYYDY7G6A66KTIPGYZVT","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":"9a531bbb8d149e24bf9473db4587423d75e0dc1161e470e164299bed5cdc74f8","cross_cats_sorted":["nlin.CD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-02-27T16:43:37Z","title_canon_sha256":"0de2e112ba2cb32d62c3886a634e2196eddf9d339bc1d385d07f0f77315a685c"},"schema_version":"1.0","source":{"id":"1902.10629","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.10629","created_at":"2026-05-17T23:52:30Z"},{"alias_kind":"arxiv_version","alias_value":"1902.10629v1","created_at":"2026-05-17T23:52:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.10629","created_at":"2026-05-17T23:52:30Z"},{"alias_kind":"pith_short_12","alias_value":"43H6VSIYYDY7","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"43H6VSIYYDY7G6A6","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"43H6VSIY","created_at":"2026-05-18T12:33:10Z"}],"graph_snapshots":[{"event_id":"sha256:f1dcb54c02586bc46a363343271118e7e3ba0c74c67cdf9b725bca5804ddc0bf","target":"graph","created_at":"2026-05-17T23:52:30Z","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":"With the aim of providing a first step in the quest for a reduction of the aerodynamic drag on the rear-end of a car, we study the phenomena of separation and reattachment of an incompressible flow focusing on a specific aerodynamic geometry, namely a backward-slanted step at 25 degrees of inclination. The ensuing recirculation bubble provides the basis for an analytical and numerical investigation of streamwise-streak generation, lift-up effect, and turbulent-wake and Kelvin-Helmholtz instabilities. A linear stability analysis is performed, and an optimal control problem with a steady volumic","authors_text":"Eric Serre, Marco Martins Afonso, Philippe Meliga","cross_cats":["nlin.CD"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-02-27T16:43:37Z","title":"Optimal transient growth in an incompressible flow past a backward-slanted step"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.10629","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:bff8b8721bea670508573b949c01149ee9fee2a414e873cc46c2c04f5297bb6c","target":"record","created_at":"2026-05-17T23:52:30Z","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":"9a531bbb8d149e24bf9473db4587423d75e0dc1161e470e164299bed5cdc74f8","cross_cats_sorted":["nlin.CD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2019-02-27T16:43:37Z","title_canon_sha256":"0de2e112ba2cb32d62c3886a634e2196eddf9d339bc1d385d07f0f77315a685c"},"schema_version":"1.0","source":{"id":"1902.10629","kind":"arxiv","version":1}},"canonical_sha256":"e6cfeac918c0f1f3781ef2a6879b19aceccfb6b28b7f09073ba524132d2e1c91","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6cfeac918c0f1f3781ef2a6879b19aceccfb6b28b7f09073ba524132d2e1c91","first_computed_at":"2026-05-17T23:52:30.354310Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:52:30.354310Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yWb7cFy5F4BgAFNBG2fGuD9z9AJcWan5/mY6tru63JzNDCIXYWblgOv1ZCtEqPgcBFWu6U0sUJ/3TabFE0PBDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:52:30.354797Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.10629","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bff8b8721bea670508573b949c01149ee9fee2a414e873cc46c2c04f5297bb6c","sha256:f1dcb54c02586bc46a363343271118e7e3ba0c74c67cdf9b725bca5804ddc0bf"],"state_sha256":"57b0da14fa0144be70bc16b22cb1e4193d91f4e79416582d536aae29c7b83c76"}