{"id":394180,"date":"2024-11-19T07:27:47","date_gmt":"2024-11-19T07:27:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cht-simulation-steady-state\/"},"modified":"2024-11-19T07:27:47","modified_gmt":"2024-11-19T07:27:47","slug":"cht-simulation-steady-state","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cht-simulation-steady-state\/","title":{"rendered":"CHT-Simulation (Steady-state)"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221;&gt;Hi Everyone,&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;I could use some assistance here.&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;I am simulating &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;heat transfer in&lt;\/span&gt; a gearbox using the Conjugate Heat Transfer (CHT) method &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;with two fluid phases with VoF&lt;\/span&gt;. I&rsquo;ve already defined all interfaces as one-to-one pairings with coupled walls, ensuring they don&rsquo;t act as insulators. The heat sources are defined as volumetric heat sources (coupled).&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;I am &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;showing&lt;\/span&gt; the static temperature &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;at three different iteration numbers&lt;\/span&gt; (Steady-State Simulation&lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;) and plotting select temperatures over iterations.&lt;\/span&gt; While the temperature solution converges overall, &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;especially&lt;\/span&gt; the &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;marked&lt;\/span&gt; cylindrical regions remain relatively cold, &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;colder than their surroundings even, which is unrealistic for the stationary state&lt;\/span&gt;.&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;The temperature plot looks converged and there isn&rsquo;t any progress anymore,&lt;\/span&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;mso-ansi-language: EN-US;&#8221;&gt; &lt;span style=&#8221;background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;&#8221;&gt;but obviously fluid that is colder than all its surroundings is not &ldquo;converged&lt;\/span&gt;&rdquo;. Could you please provide any advice on how to address this issue?&lt;br&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/19-11-2024-1732001175-mceclip0.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/19-11-2024-1732001224-mceclip1.png\" \/>&lt;br&gt;&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394180","topic","type-topic","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 Everyone,I could use some assistance here.I am simulating heat transfer in a gearbox using the Conjugate Heat Transfer (CHT) method with\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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