The specification of turbulent boundary conditions for the RSM is the same as
for the other turbulence models for all boundaries except at boundaries where
flow enters the domain. Additional input methods are available for these
boundaries and are described here.
When you choose to use the RSM, the default inlet boundary condition inputs
required are identical to those required when the

model is active. You
can input the turbulence quantities using any of the turbulence specification
methods described in Section
7.2.2.
FLUENT then uses the specified
turbulence quantities to derive the Reynolds stresses at the inlet from the
assumption of isotropy of turbulence:
(12.201)
(12.202)
where
is the normal Reynolds stress component in each
direction. The boundary condition for
is determined in the same
manner as for the

turbulence models (see Section
7.2.2). To use this
method, you will select
K or Turbulence Intensity as the
ReynoldsStress Specification Method in the appropriate boundary
condition panel.
Alternately, you can directly specify the Reynolds stresses by selecting
ReynoldsStress Components as the
ReynoldsStress Specification
Method in the boundary condition panel. When this option is enabled, you
should input the Reynolds stresses directly.
You can set the Reynolds stresses by using constant values, profile
functions of coordinates (see Section
7.26), or userdefined
functions (see the separate
UDF Manual).
Figure 12.20.1: Specifying Inlet Boundary Conditions for the Reynolds Stresses