
Overview
The shearstress transport (SST)  model was developed by Menter [ 237] to effectively blend the robust and accurate formulation of the  model in the nearwall region with the freestream independence of the  model in the far field. To achieve this, the  model is converted into a  formulation. The SST  model is similar to the standard  model, but includes the following refinements:
Transport Equations for the SST

Model
The SST

model has a similar form to the standard

model:
Modeling the Effective Diffusivity
The effective diffusivities for the SST

model are given by
(12.534)  
(12.535) 
(12.537)  
(12.538) 
Modeling the Turbulence Production
Production of
The term
represents the production of turbulence kinetic energy, and is
defined as:
(12.544) 
Production of
The term
represents the production of
and is
given by
(12.545) 
(12.546) 
(12.547)  
(12.548) 
Modeling the Turbulence Dissipation
Dissipation of
The term
represents the dissipation of turbulence kinetic energy, and is
defined in a similar manner as in the standard

model
(see Section
12.5.1). The difference is in the way the term
is evaluated. In the standard

model,
is
defined as a piecewise function. For the SST

model,
is
a constant equal to 1. Thus,
(12.549) 
Dissipation of
The term
represents the dissipation of
, and is defined in a
similar manner as in the standard

model (see
Section
12.5.1). The difference is in the way the terms
and
are evaluated. In the standard

model,
is defined as a constant (0.072) and
is defined in
Equation
12.524. For the SST

model,
is a constant equal to
1. Thus,
(12.550) 
(12.551) 
CrossDiffusion Modification
The SST

model is based on both the standard

model and the
standard

model. To blend these two models together, the standard

model has been transformed into equations based on
and
, which
leads to the introduction of a crossdiffusion term (
in
Equation
12.533).
is defined as
Model Constants