{"id":389553,"date":"2024-10-14T17:25:00","date_gmt":"2024-10-14T17:25:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389553\/"},"modified":"2024-10-14T17:57:54","modified_gmt":"2024-10-14T17:57:54","slug":"389553","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389553\/","title":{"rendered":"Reply To: Reversed flows after switching inlet boundary conditions"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thanks Rob for your prompt response.&lt;\/p&gt;&lt;p&gt;Here I am referring the tank pressure as inlet pressure (gauge total pressure), which is set using the following scheme script.&lt;\/p&gt;&lt;div&gt;&nbsp;&lt;\/div&gt;&lt;div&gt;(define (change-inlet-boundary-to-pressure)&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; (if (&gt; (%rpgetvar &#8216;flow-time) 60)&nbsp;&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; (begin&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;; Set the boundary from mass-flow-inlet to pressure-inlet&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (ti-menu-load-string &#8220;define\/boundary-conditions\/zone-type inlet pressure-inlet&#8221;)&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;; Set the pressure inlet conditions: pressure = 45000 Pa (0.45 bar), temperature = 77 K&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (ti-menu-load-string &#8220;define\/boundary-conditions\/pressure-inlet inlet yes no 45000 no 0 no 77 no yes&#8221;)&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;; Output a message confirming the boundary change&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (display &#8220;Boundary condition switched to pressure inlet with pressure 45000 Pa and temperature 77 K.\\n&#8221;)&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; &nbsp; &nbsp; )&lt;\/div&gt;&lt;div&gt;&nbsp; &nbsp; )&lt;\/div&gt;&lt;div&gt;)&lt;\/div&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I created a report file to monitor gauge total pressure at the inlet so that I can adjust the set pressure in the scheme script accordingly. As for hydrogen properties, I extracted it from the REFPROP library available in Ansys into a RGP table and hook it up to the material section of hydrogen in Fluent. &nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389553","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=\"Thanks Rob for your prompt response.Here I am referring the tank pressure as inlet pressure (gauge total pressure), which is set using the following scheme script. 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