Lance Kim

Thank you for the tip! But can a time series be used to specify a heat-flux BC that is dependent on surface temperature? I would like to model the effects of a buried point heat source on ground surface temperature in the presence of radiation cooling.

Is it possible to set a temperature-dependent radiation heat-flux boundary condition? I defined an expression for the "Heat-flux BC" to all surface nodes of a simple flat plate using the expression editor as follows with temperatures in Kelvin

Current=0.8*5.67E-8 (T@(Time)^4 - 276^4)

The resultant top surface temperature is nearly identical to the constant temperature boundary condition of the lower surface. Inspecting the boundary condition shows a heat flux of around 0.006W/m2 when it should be more like 500W/m2 at a surface temperature of approximately 90degC.