{"id":461073,"date":"2026-07-08T16:51:32","date_gmt":"2026-07-08T16:51:32","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-dem-ls-dyna-coupling-official-support-status\/"},"modified":"2026-07-08T16:51:32","modified_gmt":"2026-07-08T16:51:32","slug":"rocky-dem-ls-dyna-coupling-official-support-status","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-dem-ls-dyna-coupling-official-support-status\/","title":{"rendered":"Rocky (DEM) \u2013 LS-DYNA coupling: official support status"},"content":{"rendered":"<p>&lt;div data-index=&#8221;122&#8243;&gt;Reviewing the System Coupling User&#8217;s Guide (Release 2026 R1), the list of supported coupling participants includes Mechanical\/Mechanical APDL, Fluent, CFX, Forte, Electronics Desktop\/Maxwell, FMU, Thermal Desktop, Rocky, and Files &#8211; but LS-DYNA does not appear in this list.&lt;\/div&gt;&lt;div data-index=&#8221;122&#8243;&gt;Therefore, if possible, I&#8217;d like to clarify the current status of coupling between Ansys Rocky (DEM) and LS-DYNA.&lt;\/div&gt;&lt;div data-index=&#8221;122&#8243;&gt;&nbsp;&lt;\/div&gt;&lt;div data-index=&#8221;123&#8243;&gt;So far, I&#8217;ve found clear documentation for:&lt;\/div&gt;&lt;div data-index=&#8221;123&#8243;&gt;&nbsp;&lt;\/div&gt;&lt;div data-index=&#8221;125&#8243;&gt;- Rocky &harr; Ansys Mechanical (1-way and 2-way, via System Coupling)&lt;\/div&gt;&lt;div data-index=&#8221;126&#8243;&gt;- Rocky &harr; Ansys Fluent (CFD-DEM)&lt;\/div&gt;&lt;div data-index=&#8221;127&#8243;&gt;- LS-DYNA participating in System Coupling with Fluent and MAPDL&lt;\/div&gt;&lt;div data-index=&#8221;128&#8243;&gt;- A sequential\/homogenization workflow linking Rocky &rarr; Multiscale.Sim &rarr; LS-DYNA (Cybernet&#8217;s Multiscale.Sim add-in), which is one-way and does not preserve time-resolved feedback between the two solvers&lt;\/div&gt;&lt;div data-index=&#8221;129&#8243;&gt;&nbsp;&lt;\/div&gt;&lt;div data-index=&#8221;130&#8243;&gt;My specific questions:&lt;\/div&gt;&lt;div data-index=&#8221;131&#8243;&gt;&nbsp;&lt;\/div&gt;<\/p>\n<ul>&lt;li data-index=&#8221;132&#8243;&gt;Is direct two-way co-simulation between Rocky and LS-DYNA officially supported today (2026 R1\/R2)? If so, is it via System Coupling, or another mechanism?<\/li>\n<p>&lt;li data-index=&#8221;133&#8243;&gt;If supported, is LS-DYNA&#8217;s participant status in System Coupling still a beta\/experimental feature for this type of coupling, or has it reached production maturity?<\/li>\n<p>&lt;li data-index=&#8221;134&#8243;&gt;Are there known limitations regarding the time-step mismatch between Rocky&#8217;s DEM solver and LS-DYNA&#8217;s explicit time integration (microsecond-scale)? Is subcycling or another mechanism used to reconcile this?<\/li>\n<p>&lt;li data-index=&#8221;135&#8243;&gt;Is there a reference case, tutorial, or technical manual (beyond the general System Coupling User&#8217;s Guide) that documents this specific Rocky&harr;LS-DYNA workflow?<\/li>\n<p>&lt;li data-index=&#8221;136&#8243;&gt;What licenses\/executables are required (e.g., a special LS-DYNA build with SyC DLLs, as required for LS-DYNA&harr;Fluent coupling)?<\/li>\n<\/ul>\n<p>&lt;div data-index=&#8221;138&#8243;&gt;Any pointers to official documentation, technical support cases, or example projects would be greatly appreciated.&lt;\/div&gt;&lt;div data-index=&#8221;139&#8243;&gt;Thanks in advance!&lt;\/div&gt;<\/p>\n","protected":false},"template":"","class_list":["post-461073","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["461073"],"_bbp_subscription":["675913","13640"],"_bbp_author_ip":["193.136.209.203"],"_bbp_last_reply_id":["461190"],"_bbp_last_active_id":["461190"],"_bbp_last_active_time":["2026-07-10 12:30:29"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["675913","13640"],"_btv_view_count":["67"],"_bbp_topic_status":["unanswered"]},"test":"emsantoslnec-pt"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/461073","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\/461073\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=461073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}