Two turbulent Prandtl Number

#1 · March 4, 2026, 10:28 am

In the turbulence model, there are two types of turbulent Prandtl numbers: one for the internal field and another for the wall function. How are these applied in the OpenFOAM dictionary? And why is it necessary to use different val

#2 · March 4, 2026, 2:33 pm

Prt for internal field is set to constant/turbulenceProperties file.

Prt for wall function is set to 0/alphat file.

Near the wall, the turbulent flow structure differs from the bulk flow, so the Prt used in the wall function can be employed when correction of the wall heat flux is required.

When heat transfer at the wall is insignificant or in most typical industrial problems, using the same value is acceptable.