{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone, I&#039;m new in the forum and Ls-Dyna. I&#039;m trying to simulate a gun system that consists of cartidge, ammunition, barrel and the hydraullic fluid. I&#039;ve defined the fluid in Engineering Data. When I&#039;ve tried to run the simulation so many times after tries the ways that I&#039;d found some solutions in the internet\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ls-dyna-negative-volume-problem\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"LS-Dyna, Negative volume problem. | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello everyone, I&#039;m new in the forum and Ls-Dyna. 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I&#039;m trying to simulate a gun system that consists of cartidge, ammunition, barrel and the hydraullic fluid. I&#039;ve defined the fluid in Engineering Data. When I&#039;ve tried to run the simulation so many times after tries the ways that I&#039;d found some solutions in the internet\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ls-dyna-negative-volume-problem\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mass-issue\\\/#listItem\",\"name\":\"mass-issue\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mass-issue\\\/#listItem\",\"position\":3,\"name\":\"mass-issue\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mass-issue\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ls-dyna-negative-volume-problem\\\/#listItem\",\"name\":\"LS-Dyna, Negative volume problem.\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ls-dyna-negative-volume-problem\\\/#listItem\",\"position\":4,\"name\":\"LS-Dyna, Negative volume problem.\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mass-issue\\\/#listItem\",\"name\":\"mass-issue\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ls-dyna-negative-volume-problem\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ls-dyna-negative-volume-problem\\\/\",\"name\":\"LS-Dyna, Negative volume problem. | Ansys Learning Forum\",\"description\":\"Hello everyone, I'm new in the forum and Ls-Dyna. 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