{"id":391728,"date":"2024-10-29T12:35:45","date_gmt":"2024-10-29T12:35:45","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cht-simulation-using-vof-model-steady-state\/"},"modified":"2024-10-29T12:35:45","modified_gmt":"2024-10-29T12:35:45","slug":"cht-simulation-using-vof-model-steady-state","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cht-simulation-using-vof-model-steady-state\/","title":{"rendered":"CHT Simulation Using VOF Model (Steady-State)"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I&#8217;m simulating fluid flow within a gearbox using Fluent. I have set up a Volume of Fluid (VOF) model comprising two phases: oil and air. The interface tension is constant at 0.027 N\/m. I&rsquo;m accounting for body forces in an implicit model and considering wall adhesion with a sharp\/dispersed configuration. Additionally, I&#8217;ve defined rotating walls and included a heat source in the system.&lt;\/p&gt;&lt;p&gt;Using the SST &lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;k-&omega;k\\text{-}\\omega&lt;\/span&gt;&lt;span class=&#8221;katex-html&#8221; aria-hidden=&#8221;true&#8221;&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;k&lt;\/span&gt;&lt;span class=&#8221;mord text&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;-&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;&omega;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt; turbulence model, the flow converges well, with a &lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;y+y^+&lt;\/span&gt;&lt;span class=&#8221;katex-html&#8221; aria-hidden=&#8221;true&#8221;&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;y&lt;\/span&gt;&lt;span class=&#8221;msupsub&#8221;&gt;&lt;span class=&#8221;vlist-t&#8221;&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;vlist&#8221;&gt;&lt;span class=&#8221;sizing reset-size6 size3 mtight&#8221;&gt;&lt;span class=&#8221;mbin mtight&#8221;&gt;+&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt; value under 5. I&#8217;ve also specified the oil viscosity as a function of temperature using an expression and assumed the air density to be that of an ideal, incompressible fluid. However, I&rsquo;m not observing any significant convective heat transfer to the oil.&lt;\/p&gt;&lt;p&gt;When I change the density from constant to temperature-dependent or assume the oil is an incompressible ideal fluid, the results seem counterintuitive. I don&#8217;t understand how this adjustment affects the thermal conductivity of the oil, which I&rsquo;ve set as constant.&lt;\/p&gt;&lt;p&gt;Could you please offer any tips on improving the convective heat transfer to the oil in this simulation?&lt;\/p&gt;&lt;p&gt;Best regards,&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391728","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=\"Hello,I&#039;m simulating fluid flow within a gearbox using Fluent. I have set up a Volume of Fluid (VOF) model comprising two phases: oil and air. The interface tension is constant at 0.027 N\/m. I\u2019m accounting for body forces in an implicit model and considering wall adhesion with a sharp\/dispersed configuration. 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