{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:P2CHNK2PBZZB27N2F3MZX3FZVV","short_pith_number":"pith:P2CHNK2P","schema_version":"1.0","canonical_sha256":"7e8476ab4f0e721d7dba2ed99becb9ad7693cd603be8696cf25761fa6e94eb50","source":{"kind":"arxiv","id":"2607.09552","version":1},"attestation_state":"computed","paper":{"title":"Rigorously justified local time stepping in UGKWP method for steady multiscale flow simulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Junzhe Cao, Kun Xu, Wenpei Long, Wenzhi Guo","submitted_at":"2026-07-10T16:00:46Z","abstract_excerpt":"In this Letter, local time stepping (LTS) is incorporated into the unified gas-kinetic wave-particle (UGKWP) method for steady multiscale flow simulation. It accelerates convergence step by a factor of $3.8\\times$--$20\\times$ and reduces wall-clock time by up to $21\\times$ relative to global time stepping (GTS). A rigorous analysis of the particle flux under LTS identifies that fixed per-cell as $\\Delta t_i$ is a sufficient condition for the time-averaged flux balance. This condition has not been stated in prior particle-based LTS work, where $\\Delta t_i$ varies in time and the flux balance is"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2607.09552","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-07-10T16:00:46Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"ac301cf24c0394822a070823db2c70c09db72bfa1a376ca5916afe7fc3806e82","abstract_canon_sha256":"1955b8f84cc88ff1d0f162e24c5cb09d5d637b668537e26ff12e955b6142c54d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-13T01:20:19.846821Z","signature_b64":"DDlWdoaLJlwdTlt1ZTTFdHZCf2DnTXcdPLY2nM5FWpMT2ijNULX9i9kmAaQodRRJAjo0ZcapbMG7OSr9fZgGDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7e8476ab4f0e721d7dba2ed99becb9ad7693cd603be8696cf25761fa6e94eb50","last_reissued_at":"2026-07-13T01:20:19.845852Z","signature_status":"signed_v1","first_computed_at":"2026-07-13T01:20:19.845852Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Rigorously justified local time stepping in UGKWP method for steady multiscale flow simulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Junzhe Cao, Kun Xu, Wenpei Long, Wenzhi Guo","submitted_at":"2026-07-10T16:00:46Z","abstract_excerpt":"In this Letter, local time stepping (LTS) is incorporated into the unified gas-kinetic wave-particle (UGKWP) method for steady multiscale flow simulation. It accelerates convergence step by a factor of $3.8\\times$--$20\\times$ and reduces wall-clock time by up to $21\\times$ relative to global time stepping (GTS). A rigorous analysis of the particle flux under LTS identifies that fixed per-cell as $\\Delta t_i$ is a sufficient condition for the time-averaged flux balance. This condition has not been stated in prior particle-based LTS work, where $\\Delta t_i$ varies in time and the flux balance is"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.09552","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/2607.09552/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2607.09552","created_at":"2026-07-13T01:20:19.846382+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.09552v1","created_at":"2026-07-13T01:20:19.846382+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.09552","created_at":"2026-07-13T01:20:19.846382+00:00"},{"alias_kind":"pith_short_12","alias_value":"P2CHNK2PBZZB","created_at":"2026-07-13T01:20:19.846382+00:00"},{"alias_kind":"pith_short_16","alias_value":"P2CHNK2PBZZB27N2","created_at":"2026-07-13T01:20:19.846382+00:00"},{"alias_kind":"pith_short_8","alias_value":"P2CHNK2P","created_at":"2026-07-13T01:20:19.846382+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV","json":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV.json","graph_json":"https://pith.science/api/pith-number/P2CHNK2PBZZB27N2F3MZX3FZVV/graph.json","events_json":"https://pith.science/api/pith-number/P2CHNK2PBZZB27N2F3MZX3FZVV/events.json","paper":"https://pith.science/paper/P2CHNK2P"},"agent_actions":{"view_html":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV","download_json":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV.json","view_paper":"https://pith.science/paper/P2CHNK2P","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.09552&json=true","fetch_graph":"https://pith.science/api/pith-number/P2CHNK2PBZZB27N2F3MZX3FZVV/graph.json","fetch_events":"https://pith.science/api/pith-number/P2CHNK2PBZZB27N2F3MZX3FZVV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV/action/storage_attestation","attest_author":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV/action/author_attestation","sign_citation":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV/action/citation_signature","submit_replication":"https://pith.science/pith/P2CHNK2PBZZB27N2F3MZX3FZVV/action/replication_record"}},"created_at":"2026-07-13T01:20:19.846382+00:00","updated_at":"2026-07-13T01:20:19.846382+00:00"}