{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:U4QORZWLYZWFP24PIZ5ETEOOD2","short_pith_number":"pith:U4QORZWL","canonical_record":{"source":{"id":"1111.0922","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2011-11-03T17:24:48Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"3046e202f9df5fc13f32a9f4402626fb9823ffd4d5305aa1c106fc5fee6876d1","abstract_canon_sha256":"4cb280f0d6b50584e021400a4ad841ba874ed0c9447126ad40e342b4677beea1"},"schema_version":"1.0"},"canonical_sha256":"a720e8e6cbc66c57eb8f467a4991ce1e8027b46a7946dbc970d545655db6c0ef","source":{"kind":"arxiv","id":"1111.0922","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.0922","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"arxiv_version","alias_value":"1111.0922v1","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.0922","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"pith_short_12","alias_value":"U4QORZWLYZWF","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"U4QORZWLYZWFP24P","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"U4QORZWL","created_at":"2026-05-18T12:26:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:U4QORZWLYZWFP24PIZ5ETEOOD2","target":"record","payload":{"canonical_record":{"source":{"id":"1111.0922","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2011-11-03T17:24:48Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"3046e202f9df5fc13f32a9f4402626fb9823ffd4d5305aa1c106fc5fee6876d1","abstract_canon_sha256":"4cb280f0d6b50584e021400a4ad841ba874ed0c9447126ad40e342b4677beea1"},"schema_version":"1.0"},"canonical_sha256":"a720e8e6cbc66c57eb8f467a4991ce1e8027b46a7946dbc970d545655db6c0ef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:38:31.713961Z","signature_b64":"G9t7zSJdU6Q6tCwiiHClLy1t8AqpzOjrOzHugXDfGppI3E8d04GVJBW9jq10pfT82j76tPPuz+2WEqiiltucBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a720e8e6cbc66c57eb8f467a4991ce1e8027b46a7946dbc970d545655db6c0ef","last_reissued_at":"2026-05-18T00:38:31.713529Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:38:31.713529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.0922","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":"2026-05-18T00:38:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dYu6sBNal2tYRYMgfAn2oI8LND8X/DuEieRYF5Ja59On0/3mz3JwczHxS4jZTFZG+d48FKFoQG5ahc1quip3Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:53:40.020553Z"},"content_sha256":"f5c2467c8720751128484cf0ea46927c3ae8823ea08ec35d4126f23e42e31b09","schema_version":"1.0","event_id":"sha256:f5c2467c8720751128484cf0ea46927c3ae8823ea08ec35d4126f23e42e31b09"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:U4QORZWLYZWFP24PIZ5ETEOOD2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of different Propagation Steps for the Lattice Boltzmann Method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"cs.DC","authors_text":"Georg Hager, Gerhard Wellein, Markus Wittmann, Thomas Zeiser","submitted_at":"2011-11-03T17:24:48Z","abstract_excerpt":"Several possibilities exist to implement the propagation step of the lattice Boltzmann method. This paper describes common implementations which are compared according to the number of memory transfer operations they require per lattice node update. A memory bandwidth based performance model is then used to obtain an estimation of the maximal reachable performance on different machines. A subset of the discussed implementations of the propagation step were benchmarked on different Intel and AMD-based compute nodes using the framework of an existing flow solver which is specially adapted to sim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.0922","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":"2026-05-18T00:38:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9HNrDw/jP0CD04QiGqoIamUYue2VjUqgxI5kVuGGmVLidgB1lR6YUbdVKH8wyhE1l3AlRJgz6Qqb8Q1JxEiIBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:53:40.021256Z"},"content_sha256":"405896134b449e1cbc4ac0a62521e3a3bcf526276c6b32aa63b0790d35a34609","schema_version":"1.0","event_id":"sha256:405896134b449e1cbc4ac0a62521e3a3bcf526276c6b32aa63b0790d35a34609"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/bundle.json","state_url":"https://pith.science/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/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":"2026-06-07T23:53:40Z","links":{"resolver":"https://pith.science/pith/U4QORZWLYZWFP24PIZ5ETEOOD2","bundle":"https://pith.science/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/bundle.json","state":"https://pith.science/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U4QORZWLYZWFP24PIZ5ETEOOD2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:U4QORZWLYZWFP24PIZ5ETEOOD2","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":"4cb280f0d6b50584e021400a4ad841ba874ed0c9447126ad40e342b4677beea1","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2011-11-03T17:24:48Z","title_canon_sha256":"3046e202f9df5fc13f32a9f4402626fb9823ffd4d5305aa1c106fc5fee6876d1"},"schema_version":"1.0","source":{"id":"1111.0922","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.0922","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"arxiv_version","alias_value":"1111.0922v1","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.0922","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"pith_short_12","alias_value":"U4QORZWLYZWF","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"U4QORZWLYZWFP24P","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"U4QORZWL","created_at":"2026-05-18T12:26:42Z"}],"graph_snapshots":[{"event_id":"sha256:405896134b449e1cbc4ac0a62521e3a3bcf526276c6b32aa63b0790d35a34609","target":"graph","created_at":"2026-05-18T00:38:31Z","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":"Several possibilities exist to implement the propagation step of the lattice Boltzmann method. This paper describes common implementations which are compared according to the number of memory transfer operations they require per lattice node update. A memory bandwidth based performance model is then used to obtain an estimation of the maximal reachable performance on different machines. A subset of the discussed implementations of the propagation step were benchmarked on different Intel and AMD-based compute nodes using the framework of an existing flow solver which is specially adapted to sim","authors_text":"Georg Hager, Gerhard Wellein, Markus Wittmann, Thomas Zeiser","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2011-11-03T17:24:48Z","title":"Comparison of different Propagation Steps for the Lattice Boltzmann Method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.0922","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:f5c2467c8720751128484cf0ea46927c3ae8823ea08ec35d4126f23e42e31b09","target":"record","created_at":"2026-05-18T00:38:31Z","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":"4cb280f0d6b50584e021400a4ad841ba874ed0c9447126ad40e342b4677beea1","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2011-11-03T17:24:48Z","title_canon_sha256":"3046e202f9df5fc13f32a9f4402626fb9823ffd4d5305aa1c106fc5fee6876d1"},"schema_version":"1.0","source":{"id":"1111.0922","kind":"arxiv","version":1}},"canonical_sha256":"a720e8e6cbc66c57eb8f467a4991ce1e8027b46a7946dbc970d545655db6c0ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a720e8e6cbc66c57eb8f467a4991ce1e8027b46a7946dbc970d545655db6c0ef","first_computed_at":"2026-05-18T00:38:31.713529Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:31.713529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G9t7zSJdU6Q6tCwiiHClLy1t8AqpzOjrOzHugXDfGppI3E8d04GVJBW9jq10pfT82j76tPPuz+2WEqiiltucBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:31.713961Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.0922","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f5c2467c8720751128484cf0ea46927c3ae8823ea08ec35d4126f23e42e31b09","sha256:405896134b449e1cbc4ac0a62521e3a3bcf526276c6b32aa63b0790d35a34609"],"state_sha256":"c4dc65da5875ae38a339af94ce0ab31cb57f2867eb97fec7fca8c18530bf4fb1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/t6+aPTXunRZaRDuOg0277aGXZ+T7y/8oDa6ijzgZ3LkAzHLb+0ojfrbSXMGyUvcGEDLJ4r1CPDaQc1wPyP8Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T23:53:40.025724Z","bundle_sha256":"0b7eb6d5f01593438f119f80b90035ad3741cc49663f32f140877a4aba302822"}}