{"id":395840,"date":"2024-11-30T11:20:35","date_gmt":"2024-11-30T11:20:35","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ls-dyna-negative-volume-problem\/"},"modified":"2024-12-03T11:54:04","modified_gmt":"2024-12-03T11:54:04","slug":"ls-dyna-negative-volume-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ls-dyna-negative-volume-problem\/","title":{"rendered":"LS-Dyna, Negative volume problem."},"content":{"rendered":"<p>&lt;p&gt;Hello everyone, I&#8217;m new in the forum and Ls-Dyna. I&#8217;m trying to simulate a gun system that consists of cartidge, ammunition, barrel and the hydraullic fluid. I&#8217;ve defined the fluid in Engineering Data. When I&#8217;ve tried to run the simulation so many times after tries the ways that I&#8217;d found some solutions in the internet to solve the problem, I&#8217;ve got always &#8220;termination due to the mass increase error&#8221;. Could you help me about the problem? I&#8217;ve attached some screenshots(2022 R2). I&#8217;ve also read; https:\/\/www.dynasupport.com\/howtos\/material\/negative-volume-in-soft-materials&lt;\/p&gt;&lt;p&gt;1-Tried to things that I don&#8217;t know clearly;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965151-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;2-Fluid data;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965254-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;3-Mesh;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965354-mceclip4.png\" \/>&lt;\/p&gt;&lt;p&gt;4-Settings;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965410-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;5-\u0130nfo;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965471-mceclip7.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965450-mceclip6.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/30-11-2024-1732965485-mceclip8.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395840","topic","type-topic","status-closed","hentry","topic-tag-LS-DYNAruntime-1","topic-tag-ansys-workbench-ls-dyna","topic-tag-mass-issue","topic-tag-negative-volume"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["395840"],"_bbp_subscription":["487392","480261","199"],"_bbp_author_ip":["31.223.43.87"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["487392","480261","199"],"_btv_view_count":["456"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_last_reply_id":["396056"],"_bbp_last_active_id":["396056"],"_bbp_last_active_time":["2024-12-03 11:53:53"]},"test":"e56d887e32c0631693753157bc919d387561dc44"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/395840","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\/395840\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=395840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}