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Buoyancy force term in Fluent

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Old   August 23, 2021, 02:45
Default Buoyancy force term in Fluent
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I am modeling laser melting of a solid. Above the melting point, a Buoyancy force should act. Do I need to add this Buoyancy force separately through a UDF? I understand that gravity is there in the momentum equation. Above the melting point, a Buoyancy force is added. So, is it automatically added by Fluent or I need to add is using an external source term in the UDF?
I am using VOF with Solidification/Melting in FLUENT.
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Old   August 27, 2021, 12:49
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Quote:
Originally Posted by Cooper24 View Post
Above the melting point, a Buoyancy force is added.
Why do we need to add a separate buoyancy force as a source term in the above melting point cases?
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Old   August 27, 2021, 17:58
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Hi, I am not sure. I am asking whether we need to add it separately using a UDF or FLUENT automatically adds it. I am confused because I haven't given coefficient of volumetric expansion in the properties section.
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buoyancy driven flow, solidification/melting, volume of fluid

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