{"id":389527,"date":"2024-10-14T15:31:15","date_gmt":"2024-10-14T15:31:15","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reversed-flows-after-switching-inlet-boundary-conditions\/"},"modified":"2024-10-14T15:31:15","modified_gmt":"2024-10-14T15:31:15","slug":"reversed-flows-after-switching-inlet-boundary-conditions","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reversed-flows-after-switching-inlet-boundary-conditions\/","title":{"rendered":"Reversed flows after switching inlet boundary conditions"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone,&lt;\/p&gt;&lt;p&gt;I am modeling hydrogen storage in a tank with adsorbent materials using Ansys 2023R1.&lt;\/p&gt;&lt;p&gt;The inlet boundary condition is initially a mass flow inlet, which automatically switches to a pressure inlet after 1 minute through a scheme command. However, Fluent crashes (floating point exception) when the set pressure at the inlet is slightly higher than the tank pressure at that time. It only accepts set pressures equal to or lower than the tank pressure. While the simulation continues to run, I observe severe reversed flow (40%-80%) at the pressure inlet boundary after the switch. I have tried reducing the time step size from 0.1s to 0.01s and lowering relaxation factors, but the issue persists. I suspect the pressure gradient caused by the heat of adsorption is affecting the solver&rsquo;s ability to handle the new boundary conditions.&lt;\/p&gt;&lt;p&gt;I appreciate your advice and insights on this.&nbsp;&lt;\/p&gt;&lt;p&gt;Thank you.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389527","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 am modeling hydrogen storage in a tank with adsorbent materials using Ansys 2023R1.The inlet boundary condition is initially a mass flow inlet, which automatically switches to a pressure inlet after 1 minute through a scheme command. 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