{"id":396341,"date":"2024-12-04T23:35:10","date_gmt":"2024-12-04T23:35:10","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/flow-in-a-closed-loop\/"},"modified":"2024-12-04T23:35:10","modified_gmt":"2024-12-04T23:35:10","slug":"flow-in-a-closed-loop","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/flow-in-a-closed-loop\/","title":{"rendered":"flow in a closed loop"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I am running simulations of a circulating water tunnel. I set up peridic boundary conditions at the inlet and outlet (surfaces spaced by 1 mm) and applied a mass flow rate of 20 kg\/s so that the flow at the outlet is the same as the flow in the inlet. When I set a pressure gradient of 0 Pa\/s and run the simulation, somehow a pressure gradient appears which is completely false as seen in the picture. I am not sure if I am using the right method to simulate the flow in a circulating water channel. How would you procede?&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/04-12-2024-1733354871-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/04-12-2024-1733354854-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396341","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["396341"],"_bbp_subscription":["348235","199"],"_bbp_author_ip":["2001:67c:10ec:574f:8000::fe"],"_bbp_last_reply_id":["396418"],"_bbp_last_active_id":["396418"],"_bbp_last_active_time":["2024-12-05 13:04:41"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["348235","199"],"_btv_view_count":["160"],"_bbp_topic_status":["unanswered"]},"test":"avillanuevastudent-ethz-ch"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396341","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\/396341\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}