{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:AOPZYBENGICCGTQC5VJZUZVPGW","short_pith_number":"pith:AOPZYBEN","canonical_record":{"source":{"id":"1809.08684","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-09-23T21:46:48Z","cross_cats_sorted":["math.NA"],"title_canon_sha256":"6ffe1c5fe1618972dbd54f53faedf586dedf75e3696deec0fe8bf7b0d395cba0","abstract_canon_sha256":"589cbb192df409247d9336595797aff205755a61977d929a64a1f4f8cc61c525"},"schema_version":"1.0"},"canonical_sha256":"039f9c048d3204234e02ed539a66af35aa821c7e9bc52b11a6abf2929332aa88","source":{"kind":"arxiv","id":"1809.08684","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08684","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08684v2","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08684","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"pith_short_12","alias_value":"AOPZYBENGICC","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"AOPZYBENGICCGTQC","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"AOPZYBEN","created_at":"2026-05-18T12:32:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:AOPZYBENGICCGTQC5VJZUZVPGW","target":"record","payload":{"canonical_record":{"source":{"id":"1809.08684","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-09-23T21:46:48Z","cross_cats_sorted":["math.NA"],"title_canon_sha256":"6ffe1c5fe1618972dbd54f53faedf586dedf75e3696deec0fe8bf7b0d395cba0","abstract_canon_sha256":"589cbb192df409247d9336595797aff205755a61977d929a64a1f4f8cc61c525"},"schema_version":"1.0"},"canonical_sha256":"039f9c048d3204234e02ed539a66af35aa821c7e9bc52b11a6abf2929332aa88","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:44:43.008298Z","signature_b64":"dewUwnwcrH1uo9SMx4gbuEQv3R/0OUFEc7B0LJC78EU1f1sCGLoqGHUPXTJqhbgUPlVqNfVwDBSVaDl+bvhKBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"039f9c048d3204234e02ed539a66af35aa821c7e9bc52b11a6abf2929332aa88","last_reissued_at":"2026-05-17T23:44:43.007674Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:44:43.007674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.08684","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":"2026-05-17T23:44:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8pXRyUArlaT/0dI67vIQh5EEojdA+1LMjlPHTMKUcxw5ysHSS2sTWiEt0I3IEUpT+so7+k2RY3NJCwqmItFJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:21:30.391551Z"},"content_sha256":"03d0e052c3b02acdec2c282aba08228e775fd7274b95b1bb9cd3e1ff96dcdfc4","schema_version":"1.0","event_id":"sha256:03d0e052c3b02acdec2c282aba08228e775fd7274b95b1bb9cd3e1ff96dcdfc4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:AOPZYBENGICCGTQC5VJZUZVPGW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reduced Order Modeling Framework for Combustor Instabilities Using Truncated Domain Training","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.NA"],"primary_cat":"physics.flu-dyn","authors_text":"Cheng Huang, Jiayang Xu, Karthik Duraisamy","submitted_at":"2018-09-23T21:46:48Z","abstract_excerpt":"A multi-fidelity framework is established and demonstrated for prediction of combustion instabilities in rocket engines. The major idea is to adapt appropriate fidelity modeling approaches for different components in a rocket engine to ensure accurate and efficient predictions. Specifically, the proposed framework integrates projection-based Reduced Order Models (ROMs) that are developed using bases generated on truncated domain simulations. The ROM training is performed on truncated domains, and thus does not require full order model solutions on the full rocket geometry, thus demonstrating t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08684","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":"2026-05-17T23:44:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g2obJ2heFz3T2Tcdzd5vQ9XWA+90jx6niibIFC+B025v03JqIJKf+2qMLL3EINfUfnu0ZtL+Y+zvBt3tJtknAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:21:30.391902Z"},"content_sha256":"7cf5c8d9880565fe77510a2d5d0280b73c2530504074ea0136e0aed5939535de","schema_version":"1.0","event_id":"sha256:7cf5c8d9880565fe77510a2d5d0280b73c2530504074ea0136e0aed5939535de"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AOPZYBENGICCGTQC5VJZUZVPGW/bundle.json","state_url":"https://pith.science/pith/AOPZYBENGICCGTQC5VJZUZVPGW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AOPZYBENGICCGTQC5VJZUZVPGW/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":"2026-05-28T08:21:30Z","links":{"resolver":"https://pith.science/pith/AOPZYBENGICCGTQC5VJZUZVPGW","bundle":"https://pith.science/pith/AOPZYBENGICCGTQC5VJZUZVPGW/bundle.json","state":"https://pith.science/pith/AOPZYBENGICCGTQC5VJZUZVPGW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AOPZYBENGICCGTQC5VJZUZVPGW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:AOPZYBENGICCGTQC5VJZUZVPGW","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":"589cbb192df409247d9336595797aff205755a61977d929a64a1f4f8cc61c525","cross_cats_sorted":["math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-09-23T21:46:48Z","title_canon_sha256":"6ffe1c5fe1618972dbd54f53faedf586dedf75e3696deec0fe8bf7b0d395cba0"},"schema_version":"1.0","source":{"id":"1809.08684","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08684","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08684v2","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08684","created_at":"2026-05-17T23:44:43Z"},{"alias_kind":"pith_short_12","alias_value":"AOPZYBENGICC","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"AOPZYBENGICCGTQC","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"AOPZYBEN","created_at":"2026-05-18T12:32:13Z"}],"graph_snapshots":[{"event_id":"sha256:7cf5c8d9880565fe77510a2d5d0280b73c2530504074ea0136e0aed5939535de","target":"graph","created_at":"2026-05-17T23:44:43Z","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":"A multi-fidelity framework is established and demonstrated for prediction of combustion instabilities in rocket engines. The major idea is to adapt appropriate fidelity modeling approaches for different components in a rocket engine to ensure accurate and efficient predictions. Specifically, the proposed framework integrates projection-based Reduced Order Models (ROMs) that are developed using bases generated on truncated domain simulations. The ROM training is performed on truncated domains, and thus does not require full order model solutions on the full rocket geometry, thus demonstrating t","authors_text":"Cheng Huang, Jiayang Xu, Karthik Duraisamy","cross_cats":["math.NA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-09-23T21:46:48Z","title":"Reduced Order Modeling Framework for Combustor Instabilities Using Truncated Domain Training"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08684","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":"sha256:03d0e052c3b02acdec2c282aba08228e775fd7274b95b1bb9cd3e1ff96dcdfc4","target":"record","created_at":"2026-05-17T23:44:43Z","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":"589cbb192df409247d9336595797aff205755a61977d929a64a1f4f8cc61c525","cross_cats_sorted":["math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-09-23T21:46:48Z","title_canon_sha256":"6ffe1c5fe1618972dbd54f53faedf586dedf75e3696deec0fe8bf7b0d395cba0"},"schema_version":"1.0","source":{"id":"1809.08684","kind":"arxiv","version":2}},"canonical_sha256":"039f9c048d3204234e02ed539a66af35aa821c7e9bc52b11a6abf2929332aa88","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"039f9c048d3204234e02ed539a66af35aa821c7e9bc52b11a6abf2929332aa88","first_computed_at":"2026-05-17T23:44:43.007674Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:44:43.007674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dewUwnwcrH1uo9SMx4gbuEQv3R/0OUFEc7B0LJC78EU1f1sCGLoqGHUPXTJqhbgUPlVqNfVwDBSVaDl+bvhKBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:44:43.008298Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.08684","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:03d0e052c3b02acdec2c282aba08228e775fd7274b95b1bb9cd3e1ff96dcdfc4","sha256:7cf5c8d9880565fe77510a2d5d0280b73c2530504074ea0136e0aed5939535de"],"state_sha256":"68e58131f72ad06cd7a9418108c1a442a86b0e9350e9a165ff48f182ec22a976"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IluLKzIroMpZUdLiexLU8W9z+TeSazlcmkzxPxWh5C15TUWUUj7iDN+XWoLVliFmHqfmvT+JhfIV5E7JseAaDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T08:21:30.394073Z","bundle_sha256":"8641172cd8730ca6aeaddaaaa4edfb9d22df1fc02862fd35d34ed2991dc0d76b"}}