{"id":153359,"date":"2017-10-04T12:20:17","date_gmt":"2017-10-04T12:20:17","guid":{"rendered":"\/forum\/forums\/topic\/in-explicit-dynamics-why-is-the-euler-cell-over-emptied-message-issued\/"},"modified":"2017-10-04T12:20:17","modified_gmt":"2017-10-04T12:20:17","slug":"in-explicit-dynamics-why-is-the-euler-cell-over-emptied-message-issued","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/in-explicit-dynamics-why-is-the-euler-cell-over-emptied-message-issued\/","title":{"rendered":"In Explicit Dynamics, why is the &#8220;Euler Cell Over Emptied&#8221; message issued?"},"content":{"rendered":"<p><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif;font-size: 15px\">The Euler Cell Over Emptied warning message indicates that a large volume fraction of a material ( &gt; 0.9) is being transported into or out of an Euler cell in a single time step. AUTODYN issues this message to notify the user of potential numerical error caused by transporting excessive material in a single time step. The following recommendations may help alleviate this issue. 1. Use Internal Energy Transport (Global -&gt; Transport). The AUTODYN default is Total Energy Transport. However, in explosive detonation calculations where the detonation products escape into a void at high speed, a better result may be achieved using internal energy transport, because that approach provides a more accurate determination of the internal energy in a cell, which in turn is then used in the explosive equation of state. 2. Increase the minimum Euler density (Material -&gt; Modify -&gt; Cutoffs). The escaping detonation products are typically at very low density. It is useful to limit the diffusion of extremely small masses by increasing this cutoff value. 3.Use a Maximum velocity cutoff of approximately 10,000 m\/sec. The predicted velocities of very small masses of material escaping into a void can sometimes be unrealistic. You can limit this behavior by setting the Maximum velocity cutoff using Global -&gt; Cutoffs.<\/span><\/p>\n","protected":false},"template":"","class_list":["post-153359","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_view_count":["87"],"_bbp_likes_count":["0","0"],"_bbp_forum_subforum_count":["0"],"_btv_view_count":["352"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["153359"],"_bbp_forum_id":["153282"],"_bbp_engagement":["14986"],"_bbp_voice_count":["1"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["153360"],"_bbp_last_active_id":["153360"],"_bbp_last_active_time":["2017-10-05 11:39:21"]},"test":"vganore"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/153359","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\/153359\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=153359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}