{"id":391983,"date":"2024-10-30T11:35:34","date_gmt":"2024-10-30T11:35:34","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391983\/"},"modified":"2024-10-30T11:35:34","modified_gmt":"2024-10-30T11:35:34","slug":"391983","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391983\/","title":{"rendered":"Reply To: Components of flow direction"},"content":{"rendered":"<p>&lt;p&gt;The mass flow boundary (and if it&#8217;s constant density use a velocity bc) has direction vector options as you&#8217;ve seen. The component values are for you to decide, but for swirl I&#8217;d tend to favour axial and angular components over axial and tangential. Tangential velocity would need a profile whilst angular may be constant over the radial profile.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391983","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=\"The mass flow boundary (and if it&#039;s constant density use a velocity bc) has direction vector options as you&#039;ve seen. The component values are for you to decide, but for swirl I&#039;d tend to favour axial and angular components over axial and tangential. Tangential velocity would need a profile whilst angular may be constant over\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391983\/\" \/>\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=\"Reply To: Components of flow direction | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The mass flow boundary (and if it&#039;s constant density use a velocity bc) has direction vector options as you&#039;ve seen. The component values are for you to decide, but for swirl I&#039;d tend to favour axial and angular components over axial and tangential. Tangential velocity would need a profile whilst angular may be constant over\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391983\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-30T11:35:34+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-30T11:35:34+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Components of flow direction | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The mass flow boundary (and if it&#039;s constant density use a velocity bc) has direction vector options as you&#039;ve seen. The component values are for you to decide, but for swirl I&#039;d tend to favour axial and angular components over axial and tangential. Tangential velocity would need a profile whilst angular may be constant over\" \/>\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\\\/reply\\\/391983\\\/#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\\\/forums\\\/reply\\\/391983\\\/#listItem\",\"name\":\"Reply To: Components of flow direction\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/391983\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Components of flow direction\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@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\\\/reply\\\/391983\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/391983\\\/\",\"name\":\"Reply To: Components of flow direction | Ansys Learning Forum\",\"description\":\"The mass flow boundary (and if it's constant density use a velocity bc) has direction vector options as you've seen. The component values are for you to decide, but for swirl I'd tend to favour axial and angular components over axial and tangential. 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The component values are for you to decide, but for swirl I'd tend to favour axial and angular components over axial and tangential. 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