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Convective and Radiative heat B.C. in Free surface modelling during solidification

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Old   July 9, 2017, 15:19
Question Convective and Radiative heat B.C. in Free surface modelling during solidification
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sebastian bergman
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I am trying to model solidification in an ingot. I am using a multiphase model with air and molten metal. I need to define the top surface as a free surface thus i did define the top surface as a pressure outlet boundary condition with 0 gauge pressure.

but now i need to define certain thermal boundary conditions also, such as convective and radiative heat loss from top of the melt. There isn't any option regarding that in fluent.
what can i do in this case? Do i have to write a udf for that?
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