{"id":318954,"date":"2023-11-22T05:30:31","date_gmt":"2023-11-22T05:30:31","guid":{"rendered":"\/forum\/forums\/reply\/318954\/"},"modified":"2023-11-22T06:25:29","modified_gmt":"2023-11-22T06:25:29","slug":"318954","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/318954\/","title":{"rendered":"Reply To: VOF evaporation problem"},"content":{"rendered":"<p>&lt;p&gt;Reverted back to 2D model to allow refinement at the center of the domain. Here&rsquo;s the mesh structure around inlet, with size of 0.006 m.&lt;\/p&gt;&lt;p&gt;&nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/22-11-2023-1700630492-mesh.png\" alt=\"\" width=\"568\" height=\"403\" \/>&lt;\/p&gt;&lt;p&gt;The simulation worked well at first (I used small time step of 0.0001 and adaptive time step to speed up the calculation later on), which was sufficient for a while), until the vaporization stated to kick in. As soon as some vapor built up, the Courant number shot up to above 250 (perhaps due to sudden surge of vapor formation?), as well as the residuals, which resulted in the simulation to crash.&lt;\/p&gt;&lt;p&gt;Is there any way to automatically decrease the time step as soon as the solver detects such sudden changes (so I don&#8217;t need to stick to something like fixed very small time step, which may take a very long computational time), or any other workaround in this case?&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/22-11-2023-1700630764-vapor fraction.png\" alt=\"\" width=\"641\" height=\"325\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/22-11-2023-1700630784-residuals.png\" alt=\"\" width=\"631\" height=\"297\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-318954","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=\"Reverted back to 2D model to allow refinement at the center of the domain. Here\u2019s the mesh structure around inlet, with size of 0.006 m. The simulation worked well at first (I used small time step of 0.0001 and adaptive time step to speed up the calculation later on), which was sufficient for a while), until\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/318954\/\" \/>\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: VOF evaporation problem | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Reverted back to 2D model to allow refinement at the center of the domain. 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