Heat transfer boundary conditions
 

I'm beginner using open foam and I try to model very simple heat transfer problem. Elbow with 2 inlets and one outlet .
Model works fine without heat tranfer. But when I solve with buoyantBoussinesqSimpleFoam I get following error message:


create time

Create mesh for time = 0


Reading g
Reading thermophysical properties

Reading field T

Reading field p_rgh

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Creating turbulence model

Selecting RAS turbulence model kEpsilon


--> FOAM FATAL ERROR: Invalid wall function specification
Patch type for patch inlet1 must be wall
Current patch type is patch

What patch type I should use for inlets and outlet? Seems bit strange to use wall for inlet. Is buoyantBoussinesqSimpleFoam solver right choice for this application?