[UMIE]

Good day,

I am trying to control the heat flux at a fluid-solid interface.

Inlet Conditions:

• Velocity = 4 m/s
• Temperature 353 K

Fluid-solid interface Initial Condition:

• Initial Solid temp = 300 K

I would like to have air flow over solid and transfer heat to solid using coupling until interface reaches 320 K. When it reaches 320K I would like to stop any more heat from being transferred to solid for a certain amount of time. After that time is reached I want to continue transferring heat from 353K air to the solid using coupling. How do I do this?

I read that DEFINE_HEAT_FLUX should only be used for external walls and not internal walls. Which udf macro can i use to do this?