{"id":367809,"date":"2024-05-21T10:06:03","date_gmt":"2024-05-21T10:06:03","guid":{"rendered":"\/forum\/forums\/reply\/367809\/"},"modified":"2024-05-21T10:06:03","modified_gmt":"2024-05-21T10:06:03","slug":"367809","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/367809\/","title":{"rendered":"Reply To: Laminar flow and pressure measurements"},"content":{"rendered":"<p>&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Beginning again&#8230; We have three cases:&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285935-blobid0.png\" width=\"641\" height=\"205\" \/>&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Essentially are the same (same inlet and outlet channels diameters, same initial velocity at the inlet).&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;The unique difference is the diameter of the circular internal duct (circular duct diameter of case #1 is the smallest).&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;The problem I see is that increasing the diameter of the internal circular duct, the average pressure is smaller (when I think should be bigger, because the velocity should decrease and the pressure increase).&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Here are new relations between the values gotten in the different cases:&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285937-blobid1.png\" width=\"378\" height=\"338\" \/>&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;As we can see, the average pressure decrease when circular duct diameter is bigger (it doesn&#8217;t have sense for me).&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Some images about the velocity and inlet profiles:&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Comparison between Case #1 (left) and Case #2 (right):&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285936-blobid2.png\" width=\"541\" height=\"285\" \/>&lt;\/p&gt;&lt;p lang=&#8221;es&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285936-blobid3.png\" width=\"541\" height=\"245\" \/>&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Comparison between Case #2 (left) and Case #3 (right):&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285937-blobid4.png\" width=\"539\" height=\"283\" \/>&lt;\/p&gt;&lt;p lang=&#8221;es&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/21-05-2024-1716285936-blobid5.png\" width=\"536\" height=\"282\" \/>&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p lang=&#8221;en-GB&#8221; style=&#8221;margin: 0in; font-family: Calibri; font-size: 11.0pt;&#8221;&gt;Thank you for your interest and best regards.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-367809","reply","type-reply","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=\"Beginning again... 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