{"id":35648,"date":"2019-05-29T09:48:33","date_gmt":"2019-05-29T09:48:33","guid":{"rendered":"\/forum\/forums\/topic\/flow-in-a-pipe-with-hagen-poiseuille-correlation\/"},"modified":"2019-05-29T09:48:33","modified_gmt":"2019-05-29T09:48:33","slug":"flow-in-a-pipe-with-hagen-poiseuille-correlation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/flow-in-a-pipe-with-hagen-poiseuille-correlation\/","title":{"rendered":"Flow in a pipe with Hagen-Poiseuille-Correlation"},"content":{"rendered":"<p>Hello Everyone,<\/p>\n<p><\/p>\n<p>I&#8217;m working with Ansys Fluent and want to simulate a simple case of laminar fluid flow in a pipe.I would like to receive the pressure drop along the pipe length.<\/p>\n<p><\/p>\n<p>I set up the following properties: &#8211; density=1500 [kg\/m^3]<\/p>\n<p><\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#8211; dyn. viscosity=2000 [Pa s]<\/p>\n<p><\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#8211; length=0,03 [m]<\/p>\n<p><\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#8211; radius=6,3801*10^-3 [m]<\/p>\n<p><\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#8211; mass-flow=0,01 [kg\/s]<\/p>\n<p><\/p>\n<p>I assigned the entry as mass-flow-inlet and the exit as pressure-outlet with a value of 0 Pa for Gauge Pressure.<\/p>\n<p><\/p>\n<p>The pressure drop through the length in the simulation was 1421070 Pa. I checked the result by a manual calculation with Hagen-Poiseuille-Correlation and had a completely different outcome (614738 Pa).<\/p>\n<p><\/p>\n<p>Does it mean to use Hagen-Poiseuille is not correct?<\/p>\n<p><\/p>\n<p>Kind regards,<\/p>\n<p><\/p>\n<p>Isabella<\/p>\n","protected":false},"template":"","class_list":["post-35648","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["7820"],"_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"],"_btv_view_count":["874"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["35648"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","22555","164429"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["86313"],"_bbp_last_active_id":["86313"],"_bbp_last_active_time":["2019-05-31 16:48:58"]},"test":"isapu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/35648","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\/35648\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=35648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}