{"id":392748,"date":"2024-11-05T10:07:22","date_gmt":"2024-11-05T10:07:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392748\/"},"modified":"2024-11-05T10:07:22","modified_gmt":"2024-11-05T10:07:22","slug":"392748","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392748\/","title":{"rendered":"Reply To: turbulent viscosity ratio and convergence issues"},"content":{"rendered":"<p>&lt;p&gt;VOF may be less stable as you&#8217;re tracking a free surface as opposed to a volume fraction. You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow.&nbsp;&lt;\/p&gt;&lt;p&gt;Stick with PISO, it&#8217;s better for transient models. I know SIMPLEC has been improved over the years, but still tend not to use it.&nbsp;&lt;\/p&gt;&lt;p&gt;Turbulent viscosity ratio is a warning, but may give you some idea of where the problems are being triggered. Have a look at the local flow field.&nbsp;&lt;\/p&gt;&lt;p&gt;Simple geometry tends to suggest a simple mesh, and far fewer opportunities for poor quality cells, or poor mesh. A complex geometry typically has regions where things need far more care.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392748","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=\"VOF may be less stable as you&#039;re tracking a free surface as opposed to a volume fraction. You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it&#039;s better for transient models. I know SIMPLEC has been improved\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392748\/\" \/>\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: turbulent viscosity ratio and convergence issues | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"VOF may be less stable as you&#039;re tracking a free surface as opposed to a volume fraction. You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it&#039;s better for transient models. I know SIMPLEC has been improved\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392748\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-05T10:07:22+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-05T10:07:22+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: turbulent viscosity ratio and convergence issues | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"VOF may be less stable as you&#039;re tracking a free surface as opposed to a volume fraction. You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it&#039;s better for transient models. 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You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it's better for transient models. 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You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it's better for transient models. I know SIMPLEC has been improved","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392748\/","article:published_time":"2024-11-05T10:07:22+00:00","article:modified_time":"2024-11-05T10:07:22+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: turbulent viscosity ratio and convergence issues | Ansys Learning Forum","twitter:description":"VOF may be less stable as you're tracking a free surface as opposed to a volume fraction. You may also be building up pockets of liquid to then slug: Eulerian may be more suitable to handle the regime change in the flow. Stick with PISO, it's better for transient models. 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