{"id":372711,"date":"2024-07-19T10:29:12","date_gmt":"2024-07-19T10:29:12","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/"},"modified":"2024-07-19T10:29:12","modified_gmt":"2024-07-19T10:29:12","slug":"372711","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/","title":{"rendered":"Reply To: Strange Divergence in natural circulation simulation simulation using VOF"},"content":{"rendered":"<p>&lt;p&gt;Read the background for wall boiling models: you don&#8217;t want to overrefine the near wall region. The other problem you&#8217;ve got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they&#8217;re a liability in multiphase as they&#8217;re just a very high aspect ratio cell in precisely the wrong place.&nbsp;&lt;\/p&gt;&lt;p&gt;Now, if your domain is initially full of water, and you boil that. Where does the volume go\/come from in the model? In reality you may compress something or deform the casing, in CFD if you&#8217;ve not set material properties it&#8217;s not going to do what you expect.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-372711","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=\"Read the background for wall boiling models: you don&#039;t want to overrefine the near wall region. The other problem you&#039;ve got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they&#039;re a liability in multiphase as they&#039;re just a very high aspect ratio cell\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/\" \/>\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: Strange Divergence in natural circulation simulation simulation using VOF | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Read the background for wall boiling models: you don&#039;t want to overrefine the near wall region. The other problem you&#039;ve got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they&#039;re a liability in multiphase as they&#039;re just a very high aspect ratio cell\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-07-19T10:29:12+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-07-19T10:29:12+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Strange Divergence in natural circulation simulation simulation using VOF | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Read the background for wall boiling models: you don&#039;t want to overrefine the near wall region. The other problem you&#039;ve got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they&#039;re a liability in multiphase as they&#039;re just a very high aspect ratio cell\" \/>\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\\\/372711\\\/#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\\\/372711\\\/#listItem\",\"name\":\"Reply To: Strange Divergence in natural circulation simulation simulation using VOF\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372711\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Strange Divergence in natural circulation simulation simulation using VOF\",\"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\\\/372711\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372711\\\/\",\"name\":\"Reply To: Strange Divergence in natural circulation simulation simulation using VOF | Ansys Learning Forum\",\"description\":\"Read the background for wall boiling models: you don't want to overrefine the near wall region. The other problem you've got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they're a liability in multiphase as they're just a very high aspect ratio cell\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/372711\\\/#breadcrumblist\"},\"datePublished\":\"2024-07-19T10:29:12+00:00\",\"dateModified\":\"2024-07-19T10:29:12+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Reply To: Strange Divergence in natural circulation simulation simulation using VOF | Ansys Learning Forum","description":"Read the background for wall boiling models: you don't want to overrefine the near wall region. The other problem you've got now is the cell aspect ratio. Inflation is great for aero type models with no change in the streamwise gradients, they're a liability in multiphase as they're just a very high aspect ratio cell","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/#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\/372711\/#listItem","name":"Reply To: Strange Divergence in natural circulation simulation simulation using VOF"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/#listItem","position":2,"name":"Reply To: Strange Divergence in natural circulation simulation simulation using VOF","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\/372711\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/372711\/","name":"Reply To: Strange Divergence in natural circulation simulation simulation using VOF | Ansys Learning Forum","description":"Read the background for wall boiling models: you don't want to overrefine the near wall region. 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