{"id":380677,"date":"2024-08-27T13:51:23","date_gmt":"2024-08-27T13:51:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/asymmetric-flow-potential-causes\/"},"modified":"2024-08-27T13:51:23","modified_gmt":"2024-08-27T13:51:23","slug":"asymmetric-flow-potential-causes","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/asymmetric-flow-potential-causes\/","title":{"rendered":"Asymmetric Flow &#8211; potential causes?"},"content":{"rendered":"<p>&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Hi,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;I am working on modelling the melting and solidification heat transfer behaviour of a phase change material (PCM) in different shaped containers.&lt;span class=&#8221;Apple-converted-space&#8221;&gt; The designs are modelled in 2-D.&nbsp;&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;For designs with curved surfaces, after some time into the melting simulations, the flow becomes asymmetric when the emerging liquid phase comes into contact with the curved surface (see images below). The flow remains asymmetric, often keeping to one side- what would be the cause of this asymmetry? This is a 2-D transient simulation, where the flow is modelled as laminar, and the magnitude of velocity is very small (max. 10^-3).&lt;span class=&#8221;Apple-converted-space&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;I have tried mesh refinement, and also gradient adaption, but the flow is still asymmetric after coming into contact with the curved surface. The solution achieves convergence within 20 iterations, and at a time step that is still above the minimum that I have set (I am using adaptive time-stepping), so I&#8217;m not sure what the problem may be.&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;I would like to know\/understand what may be the causes of the asymmetry that I am seeing. Any help would be greatly appreciated.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Many thanks,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Jada&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Velocity contours:&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/27-08-2024-1724765792-mceclip0.png\" width=\"225\" height=\"183\" \/> &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/27-08-2024-1724765917-mceclip4.png\" width=\"217\" height=\"181\" \/> &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/27-08-2024-1724765858-mceclip3.png\" width=\"215\" height=\"181\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-380677","topic","type-topic","status-publish","hentry","topic-tag-multiphase_models-1","topic-tag-2d-simulation-1","topic-tag-fluent","topic-tag-transient"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi,I am working on modelling the melting and solidification heat transfer behaviour of a phase change material (PCM) in different shaped containers. 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