{"id":395586,"date":"2024-11-27T18:31:15","date_gmt":"2024-11-27T18:31:15","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/periodic-boundary-condition-vof-multiphase\/"},"modified":"2024-11-27T18:31:15","modified_gmt":"2024-11-27T18:31:15","slug":"periodic-boundary-condition-vof-multiphase","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/periodic-boundary-condition-vof-multiphase\/","title":{"rendered":"Periodic Boundary Condition VoF multiphase"},"content":{"rendered":"<p>&lt;p&gt;Hi&lt;\/p&gt;&lt;p&gt;I am trying to simulate air-water flow in a straight pipe with periodic left and right boundaries with Volume of Fluid. After making the boundaries periodic, there is no option to specify mass flow rate, only pressure gradient option is there. I want to specify the mass flow rate at the inlet. How will I initialise the problem? Will it be through normal Initialisation? I am slightly confused-any help is greatly appreciated..thanks!&lt;\/p&gt;&lt;p&gt;AB&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395586","topic","type-topic","status-publish","hentry","topic-tag-periodic-bc-1","topic-tag-volume-of-fluid-vof"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"HiI am trying to simulate air-water flow in a straight pipe with periodic left and right boundaries with Volume of Fluid. After making the boundaries periodic, there is no option to specify mass flow rate, only pressure gradient option is there. I want to specify the mass flow rate at the inlet. How will I\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/periodic-boundary-condition-vof-multiphase\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Periodic Boundary Condition VoF multiphase | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"HiI am trying to simulate air-water flow in a straight pipe with periodic left and right boundaries with Volume of Fluid. After making the boundaries periodic, there is no option to specify mass flow rate, only pressure gradient option is there. I want to specify the mass flow rate at the inlet. 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