{"id":161547,"date":"2023-01-25T07:16:17","date_gmt":"2023-01-25T07:16:17","guid":{"rendered":"\/knowledge\/forums\/topic\/what-should-be-the-inlet-boundary-conditions-when-using-the-rans-model-for-a-turbulent-jet\/"},"modified":"2023-07-31T12:35:29","modified_gmt":"2023-07-31T12:35:29","slug":"what-should-be-the-inlet-boundary-conditions-when-using-the-rans-model-for-a-turbulent-jet","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-should-be-the-inlet-boundary-conditions-when-using-the-rans-model-for-a-turbulent-jet\/","title":{"rendered":"What should be the inlet boundary conditions when using the RANS model for a turbulent jet?"},"content":{"rendered":"<p>The behavior of the jet is very much dependent on the inlet conditions and mesh resolution around the jet&#8217;s orifice. To prescribe a turbulence intensity on the inflow is just not good enough especially for transient simulations. One needs to simulate an inlet pipe too.   Follow these steps:  1) The best way is to do a separate simulation of a pipe and get steady-state profiles of velocity, k and epsilon (or omega). Then you use these profiles as BCs for the jet&#8217;s inlet pipe. Namely, the profiles in the inlet pipe have to be fully developed before coming to the expansion and the jet starts to developed.  2) There is also a simpler way. One can also take empirical correlations for velocity, k and epsilon profiles in the inlet pipe.<\/p>\n","protected":false},"template":"","class_list":["post-161547","topic","type-topic","status-publish","hentry","topic-tag-16-2","topic-tag-cfx","topic-tag-des","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-general-cfx","topic-tag-les","topic-tag-sas","topic-tag-srs","topic-tag-turbulence"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:03"],"_btv_view_count":["907"],"siebel_km_number":["443864"],"product_version":["16.2"],"km_published_date":["2005-10-20T08:18:20.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161547\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}