{"id":453378,"date":"2026-02-27T03:01:34","date_gmt":"2026-02-27T03:01:34","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-disable-automatic-control_bulk_viscosity-keyword-in-workbench-ls-dyna\/"},"modified":"2026-02-27T03:01:34","modified_gmt":"2026-02-27T03:01:34","slug":"how-to-disable-automatic-control_bulk_viscosity-keyword-in-workbench-ls-dyna","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-disable-automatic-control_bulk_viscosity-keyword-in-workbench-ls-dyna\/","title":{"rendered":"How to disable automatic *CONTROL_BULK_VISCOSITY keyword in Workbench LS-DYNA?"},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&lt;\/p&gt;&lt;p&gt;I am running a Finite Element Analysis using ANSYS Workbench (LS-DYNA extension). I&rsquo;ve encountered an issue where the exported .k file automatically includes the *CONTROL_BULK_VISCOSITY keyword, even though I haven&#8217;t manually added this card in the outline tree.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/02\/27-02-2026-1772161292-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;This keyword is significantly affecting my simulation results. When I manually delete it from the .k file and run it via the solver manager, the results align perfectly with my expectations. However, I want to find a permanent way to disable or modify this within the Workbench interface to avoid manual editing every time.&lt;\/p&gt;&lt;p&gt;My questions are:&lt;\/p&gt;&lt;p&gt;Where is the setting located in Workbench to suppress or remove *CONTROL_BULK_VISCOSITY?&lt;\/p&gt;&lt;p&gt;Is there a default setting or a Command Snippet that might be triggering this?&lt;\/p&gt;&lt;p&gt;Any insights would be greatly appreciated. Thanks!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-453378","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["453378"],"_bbp_author_ip":["137.132.26.211"],"_bbp_last_reply_id":["453487"],"_bbp_last_active_id":["453487"],"_bbp_last_active_time":["2026-02-28 23:10:58"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["612739","13640","480261"],"_btv_view_count":["64"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["13640","480261"]},"test":"2398629771qq-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/453378","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\/453378\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=453378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}