{"id":28546,"date":"2018-01-10T22:12:40","date_gmt":"2018-01-10T22:12:40","guid":{"rendered":"\/forum\/forums\/topic\/negative-pressure-observed-before-outlet\/"},"modified":"2018-01-10T22:12:40","modified_gmt":"2018-01-10T22:12:40","slug":"negative-pressure-observed-before-outlet","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-pressure-observed-before-outlet\/","title":{"rendered":"Negative Pressure Observed before outlet"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>My simulation consists of material flowing down a barrel to a contraction to&nbsp; counterbore and then through a capillary.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/56db1df1-aa87-4d8f-8174-a82c0115a832\/239e7b2a-0fa6-489e-afb2-a86500ec2b90_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Pressure at the capillary outlet is supposed to zero, since flow is directed downstream, which was even observed with the resulting vectors.&nbsp; However it dropped to a negative pressure at the outlet (z=1.5mm).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/56db1df1-aa87-4d8f-8174-a82c0115a832\/0cc41d2d-cd1c-458d-9bb0-a86500ecedcd_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I used adaptive sizing, and set element size to 0.0075 mm.&nbsp; Using this , I obtained fairly accurate shear rates and velocities.&nbsp; I was wondering what changes could be made to make sure the pressure drops to 0 at the lowest.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/56db1df1-aa87-4d8f-8174-a82c0115a832\/c08cfa5b-e2f5-4b70-a4ec-a86500edc807_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-28546","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["713"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["1501"],"_bbp_subscription":["235487"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["28546"],"_bbp_forum_id":["27790"],"_bbp_engagement":["240","154844","154942","155086"],"_bbp_voice_count":["4"],"_bbp_reply_count":["15"],"_bbp_last_reply_id":["56381"],"_bbp_last_active_id":["56381"],"_bbp_last_active_time":["2018-01-31 16:42:16"]},"test":"bushrar"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/28546","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\/28546\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=28546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}