{"id":373701,"date":"2024-07-26T01:50:37","date_gmt":"2024-07-26T01:50:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373701\/"},"modified":"2024-07-26T01:50:37","modified_gmt":"2024-07-26T01:50:37","slug":"373701","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373701\/","title":{"rendered":"Reply To: Volume Fraction too Low. How to Improve?"},"content":{"rendered":"<p>&lt;p&gt;Hi Rob,&nbsp;&lt;\/p&gt;&lt;p&gt;I am expecting atleast 60% of liquid VF in simulation. it is a simple setup and next step is to simulate condensation over multiple tubes.&nbsp;&lt;\/p&gt;&lt;p&gt;Regarding choice of VOF model, majority of papers have used VOF to simulate condensation that&#8217;s the reason i am using.&lt;\/p&gt;&lt;p&gt;By thermal wall boundary condition, did you mean coupled wall or using heat flux? this is the condition i have applied.&lt;\/p&gt;&lt;p&gt;Also at cell zone&gt;tubewall&gt;fixed terms &gt; 273.15K. just to make sure the tube pipe will remain subcooled for condensation.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/26-07-2024-1721958516-mceclip4.png\" width=\"544\" height=\"403\" \/>&lt;\/p&gt;&lt;p&gt;let me also share the mesh of this geometry, as i am also not confident on the mesh too.&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/26-07-2024-1721957879-mceclip0.jpg\" width=\"300\" height=\"425\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/26-07-2024-1721957897-mceclip1.jpg\" width=\"465\" height=\"255\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/26-07-2024-1721957924-mceclip2.jpg\" width=\"446\" height=\"407\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/26-07-2024-1721957943-mceclip3.jpg\" width=\"546\" height=\"410\" \/>&lt;\/p&gt;&lt;p&gt;for the volumetric mesh, min size = 0.3mm, max size is 9.6mm , inflation layers 25 with first layer at 0.005mm and growth of 1.1. orthognal quality of 0.2.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-373701","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=\"Hi Rob, I am expecting atleast 60% of liquid VF in simulation. it is a simple setup and next step is to simulate condensation over multiple tubes. 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