boundary condiiton for chtMultiRegionSimpleFoam model
 

Hello,
I am trying to setup a case using chtMultiRegionSimpleFoam which contains a solid and a liquid regions. The solid is totally immersed in the liquid. The liquid is flowing at certain speed. Now I would like to apply a boundary condition of temperature on 1 surface of solid (heated higher than the environment) and calculate the heat flux taken away by the fluid. At last, I would like to calculate the heat transfer coefficient between solid and fluid.

The surface type of the solid is set to mappedWall and compressible::turbulentTemperatureCoupledBaffleMix ed in 0/T as initial condition. The temperature is set to the needed value after with this type, while the contacted surface of fluid is set to environment temperature. But when I start to run the case, the temperature of the heated surface is not corrected.
On the other hand, I tried with fixed value boundary condition for both solid and fluid, the heat flux between them is then 0, surely.

So, how should I set the boundary condition for my case? Any suggestion is highly valued. Thanks!