{"id":382509,"date":"2024-09-12T16:20:14","date_gmt":"2024-09-12T16:20:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unrealistic-velocity-at-the-entrance-of-the-pipe-orifice\/"},"modified":"2024-09-12T16:20:14","modified_gmt":"2024-09-12T16:20:14","slug":"unrealistic-velocity-at-the-entrance-of-the-pipe-orifice","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unrealistic-velocity-at-the-entrance-of-the-pipe-orifice\/","title":{"rendered":"unrealistic velocity at the entrance of the pipe (orifice)"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone,&lt;\/p&gt;&lt;p&gt;I have a pipe flow as shown in the image. The air enters the pipe through an orifice (supposed to be a hole in actual pipe). I created a regiuon around the orifice to create a real flow situation from all around the pipe. The air is being sucked from outlet using a negative pressure generated by fan. Please let me know what can i improve in the design (what i think is the problem) to improve the flow. Please find attached images. BC (0 Pa pressure inlet, -100Pa pressure outlet, can&#8217;t change bc to velocity inlet, this is the correct bc). SIMPLE scheme, steady state. the area around the orifce is given 0Pa (inlet).&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/12-09-2024-1726157876-mceclip1.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/12-09-2024-1726157860-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-382509","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello everyone,I have a pipe flow as shown in the image. 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The air enters the pipe through an orifice (supposed to be a hole in actual pipe). I created a regiuon around the orifice to create a real flow situation from all around the pipe. 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