{"id":424198,"date":"2025-03-04T04:36:20","date_gmt":"2025-03-04T04:36:20","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-calculate-reynolds-number-in-fluent-or-cfx\/"},"modified":"2025-03-04T04:36:20","modified_gmt":"2025-03-04T04:36:20","slug":"how-to-calculate-reynolds-number-in-fluent-or-cfx","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-calculate-reynolds-number-in-fluent-or-cfx\/","title":{"rendered":"How to calculate Reynolds number in Fluent or cfx"},"content":{"rendered":"<p>&lt;p&gt;I want to calculate Reynolds number in the geometry attached below, but I am confused about how to calculate the Reynolds number using Fluent?&lt;\/p&gt;&lt;p&gt;As Re=(fluid density*fluid velocity*characteristic length)\/dynamic viscosity,&nbsp; should i consider the characteristic length as inlet dia of flow (i.e., Dia of outer pipe &#8211; dia of small circular pipe) or it should be different ?&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/03\/04-03-2025-1741062388-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-424198","topic","type-topic","status-publish","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-ansys-cfd-1","topic-tag-fluid"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27796"],"_bbp_topic_id":["424198"],"_bbp_subscription":["430941","39507"],"_bbp_author_ip":["103.37.201.224"],"_bbp_last_reply_id":["424289"],"_bbp_last_active_id":["424289"],"_bbp_last_active_time":["2025-03-04 16:45:26"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["430941","39507"],"_btv_view_count":["320"],"_bbp_topic_status":["unanswered"]},"test":"rahul_kvhre-iitr-ac-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/424198","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\/424198\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=424198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}