When your
FLUENT model includes turbulence you need to activate
the relevant model and options, and supply turbulent boundary conditions.
These inputs are described in this section.
The procedure for setting up a turbulent flow problem is described below. (Note
that this procedure includes only those steps necessary for the turbulence model
itself; you will need to set up other models, boundary conditions, etc. as
usual.)
 1.
To activate the turbulence model, select
SpalartAllmaras,
kepsilon,
komega,
Reynolds Stress,
Detached Eddy Simulation (3D), and
Large Eddy Simulation (LES) (3D) under
Model in the
Viscous
Model panel (Figure
12.12.1).
Define
Models
Viscous...
Figure 12.12.1: The
Viscous Model Panel

If you choose the
kepsilon model, select
Standard,
RNG,
or
Realizable under
kepsilon Model.
If you choose the
komega model, select
Standard
or
SST under
komega Model.


The
Detached Eddy Simulation and the
Large Eddy Simulation (LES) models are available only for 3D cases.

 2.
If the flow involves walls, and you are using one of the

models or the RSM, choose one of the following options for the
NearWall Treatment in the
Viscous Model panel:

Standard Wall Functions

NonEquilibrium Wall Functions

Enhanced Wall Treatment

UserDefined Wall Functions
These nearwall options are described in detail in Section
12.10.
By default, the standard wall function is enabled.
The nearwall treatment for the SpalartAllmaras,

, and LES models is
defined automatically, as described in
Sections
12.3.7,
12.5.3, and
12.9.4,
respectively.
 3.
Enable the appropriate turbulence modeling options in the
Viscous Model panel. See Section
12.19 for details.
 4.
Specify the boundary conditions for the solution variables.
Define
Boundary Conditions...
See Section
12.20 for details.
 5.
Specify the initial guess for the solution variables.
Solve
Initialize
Initialize...
See Section
12.21 for details.
Note that Reynolds stresses are automatically initialized using
, and
therefore need not be initialized.
Previous:
12.11.1 NearWall Mesh Guidelines
Up:
12. Modeling Turbulence
Next:
12.13 Setting Up the
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