{"id":396476,"date":"2024-12-05T16:16:40","date_gmt":"2024-12-05T16:16:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-define-the-control-volume-in-the-keyword-simple_airbag_model\/"},"modified":"2024-12-05T16:16:40","modified_gmt":"2024-12-05T16:16:40","slug":"how-to-define-the-control-volume-in-the-keyword-simple_airbag_model","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-define-the-control-volume-in-the-keyword-simple_airbag_model\/","title":{"rendered":"How to define the control volume in the keyword Simple_airbag_model?"},"content":{"rendered":"<p>&lt;p&gt;Hi, everyone. I would like to ask a question about the setting control volume in the keyword Simple_airbag_model. There is a shell box and a solid box in my model(They have similar Elastic modulus). The solid box is smaller and inside the shell box. What I want to do is:&lt;br&gt;(1) apply gas into the space between the shell box and solid box&lt;br&gt;(2) apply thermal expansion on the solid box==&gt; to check the influence of solid thermal expansion on the gas and shell box&lt;br&gt;However, I don&#8217;t know how to set the space between the shell box and solid box as the closed control volume. I tried the segment which combined both solid and shell box surface, but the result was not correct. Can anyone help me with the problem? Thank you so much in advance!&lt;br&gt;&nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/05-12-2024-1733415271-Capture.JPG\" alt=\"\" width=\"599\" height=\"344\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/05-12-2024-1733415293-Capture 2.JPG\" alt=\"\" width=\"736\" height=\"277\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396476","topic","type-topic","status-publish","hentry","topic-tag-airbag-1","topic-tag-mechanical","topic-tag-structures"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["396476"],"_bbp_subscription":["489772","37202"],"_bbp_author_ip":["129.27.213.73"],"_bbp_last_reply_id":["396975"],"_bbp_last_active_id":["396975"],"_bbp_last_active_time":["2024-12-10 17:14:19"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["489772","37202"],"_btv_view_count":["342"],"_bbp_topic_status":["unanswered"]},"test":"steigerjungmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396476","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\/396476\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}