{"id":44690,"date":"2020-06-03T00:23:03","date_gmt":"2020-06-03T00:23:03","guid":{"rendered":"\/forum\/forums\/topic\/what-model-to-use-when-having-both-turbulent-and-laminar-flow-simultaneously-in-simulation-domain\/"},"modified":"2020-06-03T00:23:03","modified_gmt":"2020-06-03T00:23:03","slug":"what-model-to-use-when-having-both-turbulent-and-laminar-flow-simultaneously-in-simulation-domain","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-model-to-use-when-having-both-turbulent-and-laminar-flow-simultaneously-in-simulation-domain\/","title":{"rendered":"What model to use when having both turbulent and laminar flow simultaneously in simulation domain"},"content":{"rendered":"<p>Please see the figure below. Hope the information is clear.&nbsp;<\/p>\n<p><\/p>\n<p>Now imagine we have flow comes into a larger tube (Tube 1) from left, and then moves into a smaller tube (Tube 2) and exit Tube 2 from the right. By mass balance, we can easily find out that the Reynolds number between Tube 1 and Tube 2 is:&nbsp;<\/p>\n<p><\/p>\n<p>Re1\/Re2=D2\/D1<\/p>\n<p><\/p>\n<p>So by picking the right D1 and D2, we can easily have laminar flow in Tube 1 and turbulent flow in Tube 2. In this case, what model should we use? Laminar model or turbulent model?&nbsp;It seems neither would work and I couldn&#8217;t figure out how I should model this problem.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/5853c5e6-3d43-4a8c-b7b2-aa4500f0d4d8\/ef9b4390-e248-4994-a77b-abcf0004bfde_question.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-44690","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16871"],"_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":["1"],"_btv_view_count":["3116"],"_bbp_subscription":["240087"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44690"],"_bbp_forum_id":["27792"],"_bbp_engagement":["59","165116"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["116686"],"_bbp_last_active_id":["116686"],"_bbp_last_active_time":["2020-06-03 21:28:08"]},"test":"alexc"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44690","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\/44690\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}