OpenFOAM has two solvers (chtMultiRegionFoam and chtMultiRegionSimpleFoam ) for simulation of heat transfer across different materials. When a solver has the keyword simple in it’s name in OpenFOAM, it means it uses SIMPLE algorithm for pressure-velocity decouple, Moreover, it represent it is an steady solver.
here, i mention two conjugate heat transfer problems i’ve done using these solvers:
- transient heat transfer between two co-center pipes.

- air flow over heated obstacles are simulated based on Ref [1]. The velocity contour and solid temperature is shown blow

References
- Young, T.J. and Vafai, K., 1998. Convective flow and heat transfer in a channel containing multiple heated obstacles. International Journal of Heat and Mass Transfer, 41(21), pp.3279-3298.