#122: Difference between OP2 and enhanced OP2<\/p>\n
There are two formats of OP2 that Nastran can generate. There is the old-style OP2 that is generated when you have PARAM, POST, -1<\/strong> in the input deck and can only be read into Patran using the ‘Read OP2’ option. The results from the regular OP2 are imported and stored in the db, which can cause problems for large amounts of data.<\/p>\n The other format is the Enhanced OP2 that is generated when you have PARAM,POST,1<\/strong> in the input deck. As of Patran 2013, this is written by default when you request op2 output.<\/p>\n Here are some key features of Enhanced OP2:<\/p>\n 1) It does not store the results in the Patran db, hence the db size does not increase. This feature is similar to XDB and hence is more efficient. #122: Difference between OP2 and enhanced OP2 There are two formats of OP2 that Nastran can generate. There is the old-style OP2 that is generated when you have PARAM, POST, -1 in the input deck and can only be read into Patran using the ‘Read OP2’ option. The results from the regular OP2 are imported […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_lmt_disableupdate":"yes","_lmt_disable":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-692","post","type-post","status-publish","format-standard","hentry","category-nastran"],"modified_by":"gantovnik","jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8bH0k-ba","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":700,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/125-xdb-vs-op2-in-nastran\/","url_meta":{"origin":692,"position":0},"title":"#125: xdb vs op2 in Nastran","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#125: xdb vs op2 in Nastran xdb: Entry: PARAM,POST,0 Results are accessed through Direct Results Access (DRA) working directly with MSC Nastran results database 1) xdb files are compatible primarily with Patran and other MSC Software. 2) Time to read the xdb results into the Patran database is eliminated (accessed\u2026","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":632,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/question-1-param-cards-in-nastran\/","url_meta":{"origin":692,"position":1},"title":"#99: PARAM cards in Nastran","author":"gantovnik","date":"2020-09-25","format":false,"excerpt":"#99: PARAM cards in Nastran 1) K6ROT specifies the stiffness to be added to the normal rotation for CQUAD4 and CTRIA3 elements. This is an alternate method to suppress the grid point singularities and is intended primarily for geometric nonlinear analysis. A value between 1.0 and 100.0 is recommended to\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":666,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/112-msc-nastran-sol-106\/","url_meta":{"origin":692,"position":2},"title":"#112 MSC Nastran SOL 106","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#112 MSC Nastran SOL 106 MSC Nastran SOL 106 The nonlinear effects in structures occur due to nonlinear material behavior and large deformations. Geometric nonlinearity becomes relevant when the structure is subjected to large displacement and rotation. Geometric nonlinearity effects are prominent in two aspects: geometric stiffening due to initial\u2026","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":686,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/120-sol200-extract-the-updated-element-thickness-during-topology-optimization\/","url_meta":{"origin":692,"position":3},"title":"#120: SOL200 – Extract the updated element thickness during topology optimization.","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#119: SOL200 - Extract the updated element thickness during topology optimization. 1) To extract the updated (modified) element thicknesses, use ECHO=PUNCH (NEWBULK) in the case control section. 2) Read this punch file, which contains updated bulk data into Patran. In the new database, go to File-->Import-->MSC Nastran input-->In the file\u2026","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1521,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/06\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-2-2-2\/","url_meta":{"origin":692,"position":4},"title":"#288 MSC Patran and Nastran info","author":"gantovnik","date":"2022-06-28","format":false,"excerpt":"Nastran 2017 was the first version to support flexible glue. Nastran 2018 was the first version to support recovering GPForce data for contact. Patran 20221.3 was the first version to support glue contact for SOL400. Patran 2021.4 was the first version to support the linear solution sequences. \u00a0 \u00a0 \u00a0","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":669,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/113-how-to-create-surface-from-mesh-in-patran\/","url_meta":{"origin":692,"position":5},"title":"#113: How to create surface from mesh in Patran?","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#113: How to create surface from mesh in Patran? Menu: Geometry, Action: Create, Object: Surface, Method: Mesh","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/692","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/comments?post=692"}],"version-history":[{"count":0,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/692\/revisions"}],"wp:attachment":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/media?parent=692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/categories?post=692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/tags?post=692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n2) It can store contact results which the regular OP2 can not.
\n3) In the background Patran converts the enhanced OP2 to MASTER\/DBALL and attaches it. For large op2 files this process can take a significant amount of time, and it will repeat it each time the db with the attachment is opened. For this reason it\u2019s usually better to request MASTER\/DBALL results directly rather than enhanced op2.
\n4) File size is not as large as the Master\/DBall.
\n5) Does not run into DBC issues like XDB.<\/p>\n","protected":false},"excerpt":{"rendered":"