{"id":54450,"date":"2021-04-20T08:27:26","date_gmt":"2021-04-20T08:27:26","guid":{"rendered":"\/forum\/forums\/topic\/turbulent-intensity-and-length-scale-for-a-fully-developed-pipe-flow\/"},"modified":"2021-04-20T08:27:26","modified_gmt":"2021-04-20T08:27:26","slug":"turbulent-intensity-and-length-scale-for-a-fully-developed-pipe-flow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/turbulent-intensity-and-length-scale-for-a-fully-developed-pipe-flow\/","title":{"rendered":"Turbulent intensity and length scale for a fully-developed pipe flow"},"content":{"rendered":"<p>I am looking for a reference in order to define the boundary conditions for RANS turbulence models, and I have seen two formulas for the turbulent intensity and length scale in the case of a fully-developed pipe flow (expressions 7-71 and 7-72):n7.4.2. Using Flow Boundary Conditions (ansys.com)nWhere do they come from? The most similar result that I know is that in turbulent pipe flow, Karman integral equation leads to a friction coefficient proportional to Re^(-1\/7).nThank younn<\/p>\n","protected":false},"template":"","class_list":["post-54450","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["26781"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["???E"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1697"],"_bbp_subscription":["233028"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["54450"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","186762"],"_bbp_voice_count":["2"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["150522"],"_bbp_last_active_id":["150522"],"_bbp_last_active_time":["2021-04-23 08:12:02"]},"test":"aitor"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54450","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\/54450\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=54450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}