{"id":460688,"date":"2026-07-02T23:15:07","date_gmt":"2026-07-02T23:15:07","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mpp-questions\/"},"modified":"2026-07-02T23:15:07","modified_gmt":"2026-07-02T23:15:07","slug":"mpp-questions","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mpp-questions\/","title":{"rendered":"MPP questions"},"content":{"rendered":"<p>&lt;p data-pm-slice=&#8221;0 0 []&#8221;&gt;Hello,&lt;\/p&gt;&lt;p&gt;I am new to MPP LS-DYNA and have a few questions. I create my model on a single processor (a regular PC), but it will eventually be run on a cluster, so I am trying to understand the MPP-related settings and keywords.&lt;\/p&gt;&lt;p&gt;a) While reading the documentation about output files, I came across the BINARY option for several output databases (I have attached a screenshot to illustrate my question). So far, I have always used the default value for BINARY.The documentation states:&lt;\/p&gt;&lt;p&gt;Flag for binary output&#8230;&lt;\/p&gt;&lt;p&gt;EQ.1: ASCII file is written. This is the default for shared&nbsp;memory parallel (SMP) LS-DYNA executables.&lt;br&gt;EQ.2: Data written to a binary database binout, which contains&nbsp;data that would otherwise be output to the ASCII file. The&nbsp;ASCII file in this case is not created. This is the default for&nbsp;MPP LS-DYNA executables.&lt;br&gt;EQ.3: ASCII file is written, and the data is also written to the&nbsp;binary database (NOTE: MPP LS-DYNA executables will&nbsp;only produce the binary database).&lt;\/p&gt;&lt;p&gt;Since EQ.2 is listed as the default for MPP LS-DYNA, does this mean that when I run my existing model.k file on the cluster, the output will automatically be written in binary format? Or should I explicitly set BINARY= 2 because I know the simulation will be run using the MPP executable?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;b) When LS-DYNA writes binary output files (such as binary file), can they be read directly in LS-PrePost?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;c) Under the CONTROL keywords, I noticed *CONTROL_MPP_DECOMPOSITION_FILE_{OPTION}. From the documentation, my understanding is that this keyword can either:&nbsp;create a decomposition file and terminate the simulation, or&nbsp;read a previously generated decomposition file.&nbsp;If I do not use this keyword at all, what happens? Will LS-DYNA automatically perform the domain decomposition and continue running the simulation, or is there another default behavior?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;d)would you please explain the usage of this keyword:&nbsp; CONTROL_MPP_DECOMPOSITION_FLAG_STRESS_STRAIN_CURVE ?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;e ) Do you happen to have any tutorials for learning MPP LS-DYNA?&lt;\/p&gt;&lt;p&gt;Thank you very much for your time and help.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/07\/02-07-2026-1783031852-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-460688","topic","type-topic","status-publish","hentry","topic-tag-ascii-1","topic-tag-mpp","topic-tag-output"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["460688"],"_bbp_author_ip":["142.104.85.82"],"_bbp_last_reply_id":["460693"],"_bbp_last_active_id":["460693"],"_bbp_last_active_time":["2026-07-03 07:11:49"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["682300","13640"],"_btv_view_count":["30"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["13640"]},"test":"lsdyna928gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/460688","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/460688\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=460688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}