{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:NHEXJV33D4UXP6AERCJMDH24DJ","short_pith_number":"pith:NHEXJV33","canonical_record":{"source":{"id":"2508.18202","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2025-08-25T17:01:36Z","cross_cats_sorted":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"title_canon_sha256":"22bc974fcf5d5ba63694891a0f19541c931ab2dc50e0589afd27d9743d510a77","abstract_canon_sha256":"2d34e9a801f95791c5f9d3d5d8877595e27972e64eaf33987cf2159d94adb07c"},"schema_version":"1.0"},"canonical_sha256":"69c974d77b1f2977f8048892c19f5c1a50d144200458b839f069945c67ef1849","source":{"kind":"arxiv","id":"2508.18202","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.18202","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"arxiv_version","alias_value":"2508.18202v1","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.18202","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_12","alias_value":"NHEXJV33D4UX","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_16","alias_value":"NHEXJV33D4UXP6AE","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_8","alias_value":"NHEXJV33","created_at":"2026-07-05T11:58:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:NHEXJV33D4UXP6AERCJMDH24DJ","target":"record","payload":{"canonical_record":{"source":{"id":"2508.18202","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2025-08-25T17:01:36Z","cross_cats_sorted":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"title_canon_sha256":"22bc974fcf5d5ba63694891a0f19541c931ab2dc50e0589afd27d9743d510a77","abstract_canon_sha256":"2d34e9a801f95791c5f9d3d5d8877595e27972e64eaf33987cf2159d94adb07c"},"schema_version":"1.0"},"canonical_sha256":"69c974d77b1f2977f8048892c19f5c1a50d144200458b839f069945c67ef1849","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:58:55.394339Z","signature_b64":"q74CgnfyMJqTFBu8TiBt1GlrHLEgJxo/tT/8pXsQVpiDH/2ySClYvxGMXuSfDAKr+Y28RjYf5hemmSSs1Y/kAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"69c974d77b1f2977f8048892c19f5c1a50d144200458b839f069945c67ef1849","last_reissued_at":"2026-07-05T11:58:55.393861Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:58:55.393861Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2508.18202","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":"2026-07-05T11:58:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m4RtVbI1oViHuMC4dMi/dLhtYyGt7wMSlzpBB4LzEgFbllfq9APdHg2wrnsoB1bVzmAgPjlWoQfm3FgbCwbLCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:13:52.164448Z"},"content_sha256":"074642c1e9787787cc5511534b676265be2b401d94db0e8b8fd4d6a5c2e48f57","schema_version":"1.0","event_id":"sha256:074642c1e9787787cc5511534b676265be2b401d94db0e8b8fd4d6a5c2e48f57"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:NHEXJV33D4UXP6AERCJMDH24DJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Uncertain data assimilation for urban wind flow simulations with OpenLB-UQ","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Adrian Kummerl\\\"ander, Dennis Teutscher, Martin Frank, Mathias J. Krause, Mingliang Zhong, Stephan Simonis","submitted_at":"2025-08-25T17:01:36Z","abstract_excerpt":"Accurate prediction of urban wind flow is essential for urban planning, pedestrian safety, and environmental management. Yet, it remains challenging due to uncertain boundary conditions and the high cost of conventional CFD simulations. This paper presents the use of the modular and efficient uncertainty quantification (UQ) framework OpenLB-UQ for urban wind flow simulations. We specifically use the lattice Boltzmann method (LBM) coupled with a stochastic collocation (SC) approach based on generalized polynomial chaos (gPC). The framework introduces a relative-error noise model for inflow wind"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18202","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/2508.18202/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":"2026-07-05T11:58:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H/kwS0gH72mhl2DSNuLUsDpulOT0JG2zU+gSFSGw+s30FEe7y2KjbpVpMu/X4Zs+ACq6wdQCflBiUwEiZGzbAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:13:52.164927Z"},"content_sha256":"6af51defd5b134a773576e971cdeebd8314b74152d7d84025a968fa3d3ce55a8","schema_version":"1.0","event_id":"sha256:6af51defd5b134a773576e971cdeebd8314b74152d7d84025a968fa3d3ce55a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NHEXJV33D4UXP6AERCJMDH24DJ/bundle.json","state_url":"https://pith.science/pith/NHEXJV33D4UXP6AERCJMDH24DJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NHEXJV33D4UXP6AERCJMDH24DJ/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":"2026-08-14T16:13:52Z","links":{"resolver":"https://pith.science/pith/NHEXJV33D4UXP6AERCJMDH24DJ","bundle":"https://pith.science/pith/NHEXJV33D4UXP6AERCJMDH24DJ/bundle.json","state":"https://pith.science/pith/NHEXJV33D4UXP6AERCJMDH24DJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NHEXJV33D4UXP6AERCJMDH24DJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:NHEXJV33D4UXP6AERCJMDH24DJ","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":"2d34e9a801f95791c5f9d3d5d8877595e27972e64eaf33987cf2159d94adb07c","cross_cats_sorted":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2025-08-25T17:01:36Z","title_canon_sha256":"22bc974fcf5d5ba63694891a0f19541c931ab2dc50e0589afd27d9743d510a77"},"schema_version":"1.0","source":{"id":"2508.18202","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.18202","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"arxiv_version","alias_value":"2508.18202v1","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.18202","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_12","alias_value":"NHEXJV33D4UX","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_16","alias_value":"NHEXJV33D4UXP6AE","created_at":"2026-07-05T11:58:55Z"},{"alias_kind":"pith_short_8","alias_value":"NHEXJV33","created_at":"2026-07-05T11:58:55Z"}],"graph_snapshots":[{"event_id":"sha256:6af51defd5b134a773576e971cdeebd8314b74152d7d84025a968fa3d3ce55a8","target":"graph","created_at":"2026-07-05T11:58:55Z","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/2508.18202/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Accurate prediction of urban wind flow is essential for urban planning, pedestrian safety, and environmental management. Yet, it remains challenging due to uncertain boundary conditions and the high cost of conventional CFD simulations. This paper presents the use of the modular and efficient uncertainty quantification (UQ) framework OpenLB-UQ for urban wind flow simulations. We specifically use the lattice Boltzmann method (LBM) coupled with a stochastic collocation (SC) approach based on generalized polynomial chaos (gPC). The framework introduces a relative-error noise model for inflow wind","authors_text":"Adrian Kummerl\\\"ander, Dennis Teutscher, Martin Frank, Mathias J. Krause, Mingliang Zhong, Stephan Simonis","cross_cats":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2025-08-25T17:01:36Z","title":"Uncertain data assimilation for urban wind flow simulations with OpenLB-UQ"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18202","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":"sha256:074642c1e9787787cc5511534b676265be2b401d94db0e8b8fd4d6a5c2e48f57","target":"record","created_at":"2026-07-05T11:58:55Z","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":"2d34e9a801f95791c5f9d3d5d8877595e27972e64eaf33987cf2159d94adb07c","cross_cats_sorted":["cs.MS","cs.NA","math.NA","physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2025-08-25T17:01:36Z","title_canon_sha256":"22bc974fcf5d5ba63694891a0f19541c931ab2dc50e0589afd27d9743d510a77"},"schema_version":"1.0","source":{"id":"2508.18202","kind":"arxiv","version":1}},"canonical_sha256":"69c974d77b1f2977f8048892c19f5c1a50d144200458b839f069945c67ef1849","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"69c974d77b1f2977f8048892c19f5c1a50d144200458b839f069945c67ef1849","first_computed_at":"2026-07-05T11:58:55.393861Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:58:55.393861Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q74CgnfyMJqTFBu8TiBt1GlrHLEgJxo/tT/8pXsQVpiDH/2ySClYvxGMXuSfDAKr+Y28RjYf5hemmSSs1Y/kAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:58:55.394339Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.18202","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:074642c1e9787787cc5511534b676265be2b401d94db0e8b8fd4d6a5c2e48f57","sha256:6af51defd5b134a773576e971cdeebd8314b74152d7d84025a968fa3d3ce55a8"],"state_sha256":"c17cf22fde3f7ab0d33bfd7cd40f74607f15e2247d1888a4c9a5413c9a482aff"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tsNOLmxc80SMDo0OKDhGKTlUw5jPzr4XO2LFzPWe1k8J7/CsGEcXdbq7mzJmS+bEMu9gZW6ycWz+dM7dZpxhBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T16:13:52.170378Z","bundle_sha256":"5fd113fd3b260a0714c0fed12c94a118b06ced02dcafedad6c716bd9cf5de9bb"}}