{"id":353981,"date":"2024-02-27T08:58:36","date_gmt":"2024-02-27T08:58:36","guid":{"rendered":"\/forum\/forums\/topic\/fluent-heat-flow-solid-liquid-with-natural-convection\/"},"modified":"2024-02-27T09:04:24","modified_gmt":"2024-02-27T09:04:24","slug":"fluent-heat-flow-solid-liquid-with-natural-convection","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-heat-flow-solid-liquid-with-natural-convection\/","title":{"rendered":"Fluent: Heat flow (solid-liquid) with natural convection"},"content":{"rendered":"

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Hello,<\/p>\n

I have a heat sink in my system that I cannot trace and I hope that someone can tell me where I might have made a mistake!<\/p>\n

The system:<\/p>\n

\"\"<\/a><\/p>\n

– A solid with a constant heat source (red)
– A “container” with liquid water (blue)
– A solid body with poor thermal conductivity as “insulation” (yellow)<\/p>\n

As soon as I activate gravity to obtain natural convection, the heat flow balance is no longer correct (stationary simulation). About 95% of the generated heat goes into the water and does not leave it. The temperature of the water is very low.<\/p>\n

– I have defined the density of the water with “Boussinesq” or with my own expression (density graph looks good).
– Boundary conditions: constant temperature (or partial heat flow=0)
– The grid is quite finely resolved in the transitions (>1 million elements)
– Body: A component group in the DesignModeler (seems to be no mesh problems)<\/p>\n

The Flux Report confirms that something is wrong:<\/p>\n

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Where could the error be?<\/p>\n","protected":false},"template":"","class_list":["post-353981","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t