Applying Boundary and Interface Conditions for Conjugate Heat Transfer

To allow the fluid to enter and leave the domain, set the fluid flow properties at the inflow and outflow boundaries. The CHT analysis also requires you to specify the inflow and the outflow fluid temperature. For the solid boundaries that generate or dissipate the heat, Simcenter STAR-CCM+ provides you with thermal specifications such as heat flux, heat source or temperature.

To apply the fluid boundary conditions:

Expand the Regions > [fluid region] > Boundaries > [boundary] node, set the Type of the boundary and specify the flow condition and the temperature.

To apply thermal boundary conditions at fluid and solid walls:

Select the Solid > [fluid/solid region] > Boundaries > [boundary] > Physics Conditions > Thermal Specification node and set Condition to one of the following:
- Adiabatic
- Convection
- Heat Flux
- Heat Source
- Temperature

See Thermal Specification

Define interface settings, depending on the selected solid energy model:

Solid Energy Model	Steps
Segregated Solid Energy Coupled Solid Energy	If you want to specify additional heat transfer at the interface, select the Interfaces > [interface] > Physics Condition node and set Energy Source Option to either Heat Flux or Heat Source. Select the Thermal Specification and make sure that the Condition is set to Conjugate Heat Transfer. If you want to add a thermal contact resistance at the interface, for example a thin layer of paint, select [interface] > Physics Values > Contact Resistance and specify a resistance.
Finite Element Solid Energy	Select the relevant Interfaces > [interface] node and set Type to Mapped Contact Interface. This type of interface supports explicit coupling, allowing for exchange of thermal data between the non-conformal finite volume and finite element regions.

Solid Energy Model

Steps

Segregated Solid Energy
Coupled Solid Energy

If you want to specify additional heat transfer at the interface, select the Interfaces > [interface] > Physics Condition node and set Energy Source Option to either Heat Flux or Heat Source.
Select the Thermal Specification and make sure that the Condition is set to Conjugate Heat Transfer.
If you want to add a thermal contact resistance at the interface, for example a thin layer of paint, select [interface] > Physics Values > Contact Resistance and specify a resistance.

Finite Element Solid Energy

Select the relevant Interfaces > [interface] node and set Type to Mapped Contact Interface.
This type of interface supports explicit coupling, allowing for exchange of thermal data between the non-conformal finite volume and finite element regions.