{"id":392264,"date":"2024-10-31T14:49:17","date_gmt":"2024-10-31T14:49:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\/"},"modified":"2024-10-31T14:49:17","modified_gmt":"2024-10-31T14:49:17","slug":"correct-cfx-pre-setup-to-avoid-isolated-fluid-regions","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\/","title":{"rendered":"Correct CFX Pre Setup to avoid isolated fluid regions"},"content":{"rendered":"<p>&lt;p&gt;I am trying to simulate external and internal flow however whenever I try to setup my simulation (including setting a wall on all of the other interior volume&#8217;s faces besides the inlet\/outlet) I always get an error saying there are two isolated fluid regions and the solver cannot compute. In my initial CFX-Pre window, it says my domain has two fluid-fluid interfaces. I go to those and under non-overlap conditions I set these interfaces to a no-slip wall. I then set the rest of my boundary conditions as normal (velocity inlet and 0Pa opening for the bounding box and the internal volume and no-slip walls for all other surfaces). What am I missing in my setup that causes this error?<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/31-10-2024-1730386129-Screenshot 2024-10-31 104511.png\" alt=\"\" \/>&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392264","topic","type-topic","status-publish","hentry","topic-tag-ansys-cfx","topic-tag-interface"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to simulate external and internal flow however whenever I try to setup my simulation (including setting a wall on all of the other interior volume&#039;s faces besides the inlet\/outlet) I always get an error saying there are two isolated fluid regions and the solver cannot compute. In my initial CFX-Pre window, it\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\/\" \/>\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=\"Correct CFX Pre Setup to avoid isolated fluid regions | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am trying to simulate external and internal flow however whenever I try to setup my simulation (including setting a wall on all of the other interior volume&#039;s faces besides the inlet\/outlet) I always get an error saying there are two isolated fluid regions and the solver cannot compute. In my initial CFX-Pre window, it\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-31T14:49:17+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-31T14:49:17+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Correct CFX Pre Setup to avoid isolated fluid regions | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am trying to simulate external and internal flow however whenever I try to setup my simulation (including setting a wall on all of the other interior volume&#039;s faces besides the inlet\/outlet) I always get an error saying there are two isolated fluid regions and the solver cannot compute. In my initial CFX-Pre window, it\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/interface\\\/#listItem\",\"name\":\"interface\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/interface\\\/#listItem\",\"position\":3,\"name\":\"interface\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/interface\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\\\/#listItem\",\"name\":\"Correct CFX Pre Setup to avoid isolated fluid regions\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\\\/#listItem\",\"position\":4,\"name\":\"Correct CFX Pre Setup to avoid isolated fluid regions\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/interface\\\/#listItem\",\"name\":\"interface\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/correct-cfx-pre-setup-to-avoid-isolated-fluid-regions\\\/\",\"name\":\"Correct CFX Pre Setup to avoid isolated fluid regions | Ansys Learning Forum\",\"description\":\"I am trying to simulate external and internal flow however whenever I try to setup my simulation (including setting a wall on all of the other interior volume's faces besides the inlet\\\/outlet) I always get an error saying there are two isolated fluid regions and the solver cannot compute. 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