#125: xdb vs op2 in Nastran<\/p>\n
xdb<\/strong>: Entry: PARAM,POST,0 op2<\/strong>: Entry: PARAM,POST,-1 #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 directly from Nastran result database). […]<\/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-700","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-bi","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":692,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/123-difference-between-op2-and-enhanced-op2\/","url_meta":{"origin":700,"position":0},"title":"#123: Difference between OP2 and enhanced OP2","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#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\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":688,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/121-windows-batch-script-to-run-every-nastran-input-file-in-folder\/","url_meta":{"origin":700,"position":1},"title":"#121: Windows batch script to run every Nastran input file in folder","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"This is an example of a Windows bat file to run Nastran for every *.dat file in the current folder. It also calculates the total Nastran execution time. Of course, you should change the path to nastran.exe. The nice thing here is that script uses variable set MyPath=%cd%, so you\u2026","rel":"","context":"In "batch"","block_context":{"text":"batch","link":"https:\/\/gantovnik.com\/bio-tips\/category\/batch\/"},"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":700,"position":2},"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":686,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/120-sol200-extract-the-updated-element-thickness-during-topology-optimization\/","url_meta":{"origin":700,"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":646,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/104-how-to-generate-new-bulk-data-using-updated-design-variables-from-sol200\/","url_meta":{"origin":700,"position":4},"title":"#104: How to generate new bulk data using updated design variables from SOL200","author":"gantovnik","date":"2020-09-25","format":false,"excerpt":"#104: How to generate new bulk data using updated design variables from SOL200 ECHO = PUNCH(NEWBULK) Step 1: To extract the updated (modified) element thicknesses, use ECHO=PUNCH (NEWBULK) in the case control section. This will writes the punch file with the updated thicknesses for each element which can be used\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":700,"position":5},"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":[]}],"_links":{"self":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/700","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=700"}],"version-history":[{"count":0,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/700\/revisions"}],"wp:attachment":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/media?parent=700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/categories?post=700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/tags?post=700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nResults are accessed through Direct Results Access (DRA) working directly with MSC Nastran results database
\n1) xdb files are compatible primarily with Patran and other MSC Software.
\n2) Time to read the xdb results into the Patran database is eliminated (accessed directly from Nastran result database).
\n3) Since the .xdb data is not duplicated in the Patran database, the size of the Patran database is greatly reduced.
\n4) Multiple xdb files can be accessed from a single Patran database and can be well managed, since the subcases of each xdb can be easily distinguished from one another.
\n5) xdb file size limit can go up to 8-10GB.
\n6) xdb files can only be accessed when they are located on the same machine that Patran is running.
\n7) Deleting a single Result Case from an attached .xdb file results in deleting all associated data with that attached .xdb file. i.e. deleting one Result Case deletes all Result Cases.<\/p>\n
\nResults are read in as data blocks permanently into Patran
\n1) op2 file is a universal Nastran result file which can be imported\/ read into different post-processors.
\n2) Time to read the op2 results into the Patran database is longer (data blocks are required to be read in).
\n3) Since the .op2 data is permanently attached to the Patran database, the overall size of the database increases considerably.
\n4) Though multiple op2 files can be attached to a single Patran database, the overall database size increases proportionally and it is confusing to identify the subcases that belong to a particular op2 file.
\n5) op2 file size is limited only up to 2GB.
\n6) op2 files has the flexibility by which it can be accessed from network drives or remote machine.
\n7) Individual Result Cases can be deleted in an op2 file attachment.<\/p>\n","protected":false},"excerpt":{"rendered":"