RANS turbulence model descriptor. More...

#include <cs_turbulence_model.h>

Collaboration diagram for cs_turb_rans_model_t:

Data Fields
int	irccor

int	itycor

int	idirsm

int	iclkep

int	igrhok

int	igrake

int	igrari

int	ikecou

int	reinit_turb

int	irijco

int	iddes

int	irijnu

int	irijrb

int	irijec

int	idifre

int	iclsyr

int	iclptr

double	xlomlg

Detailed Description

RANS turbulence model descriptor.

Members of this turbulence model are publicly accessible, to allow for concise syntax, as it is expected to be used in many places.

Field Documentation

◆ iclkep

iclkep

Indicates the clipping method used for $k$ and $\varepsilon$ , for the $k-\epsilon$ and v2f models

0: clipping in absolute value
1: coupled clipping based on physical relationships
Useful if and only if iturb = 20, 21 or 50 ( $k-\epsilon$ and v2f models). The results obtained with the method corresponding to iclkep =1 showed in some cases a substantial sensitivity to the values of the length scale almax.
The option iclkep = 1 is therefore not recommended, and, if chosen, must be used cautiously.

◆ iclptr

iclptr

partial implicitation of wall BCs of $\tens{R}$

1: true
0: false (default)

◆ iclsyr

iclsyr

partial implicitation of symmetry BCs of $\tens{R}$

1: true (default)
0: false

◆ iddes

iddes

delayed detached eddy simulation

1: true
0: false (default)

◆ idifre

idifre

whole treatment of the diagonal part of the diffusion tensor of $\tens{R}$ and $\varepsilon$

1: true (default)
0: simplified treatment

◆ idirsm

idirsm

turbulent diffusion model for second moment closure

0: scalar diffusivity (Shir model)
1: tensorial diffusivity (Daly and Harlow model, default model)

◆ igrake

igrake

Indicates if the terms related to gravity are taken into account in the equations of $k-\epsilon$ .

1: true (default if $\rho$ is variable)
0: false Useful if and only if iturb = 20, 21, 50 or 60 and (gravity) $\ne$ (0,0,0) and the density is not uniform.

◆ igrari

igrari

Indicates if the terms related to gravity are taken into account in the equations of $R_{ij}-\epsilon$ .

1: true (default if $\rho$ is variable)
0: false Useful if and only if iturb = 30 or 31 and (gravity) $\ne$ (0,0,0) ( $R_{ij}-\epsilon$ model with gravity) and the density is not uniform.

◆ igrhok

igrhok

Indicates if the term $\frac{2}{3}\grad \rho k$ is taken into account in the velocity equation.

1: true
0: false in the velocity Useful if and only if iturb = 20, 21, 50 or 60.
This term may generate non-physical velocities at the wall. When it is not explicitly taken into account, it is implicitly included into the pressure.

◆ ikecou

ikecou

Indicates if the coupling of the source terms of $k$ and $\epsilon$ or $k$ and $\omega$ is taken into account or not.

1: true,
0: false
If ikecou = 0 in $k-\epsilon$ model, the term in $\epsilon$ in the equation of is made implicit.
ikecou is initialised to 0 if iturb = 21 or 60, and to 1 if iturb = 20.
ikecou = 1 is forbidden when using the v2f model (iturb = 50).
Useful if and only if iturb = 20, 21 or 60 ( $k-\epsilon$ and $k-\omega$ models)

◆ irccor

irccor

activation of rotation/curvature correction for an eddy viscosity turbulence models

0: false
1: true

◆ irijco

irijco

coupled solving of Rij

1: true (default)
0: false

◆ irijec

irijec

Indicates if the wall echo terms in $R_{ij}-\epsilon$ LRR model are taken into account:

1: true,
0: false (default)
Useful if and only if iturb = 30 ( $R_{ij}-\epsilon$ LRR).
It is not recommended to take these terms into account: they have an influence only near the walls, their expression is hardly justifiable according to some authors and, in the configurations studied with Code_Saturne, they did not bring any improvement in the results.
In addition, their use induces an increase in the calculation time.
The wall echo terms imply the calculation of the distance to the wall for every cell in the domain. See icdpar for potential restrictions due to this.

◆ irijnu

irijnu

pseudo eddy viscosity in the matrix of momentum equation to partially implicit $\divv \left( \rho \tens{R} \right)$

1: true
0: false (default) The goal is to improve the stability of the calculation. The usefulness of irijnu = 1 has however not been clearly demonstrated.
Since the system is solved in incremental form, this extra turbulent viscosity does not change the final solution for steady flows. However, for unsteady flows, the parameter nswrsm should be increased.
Useful if and only if iturb = 30 or 31 ( $R_{ij}-\epsilon$ model).

◆ irijrb

irijrb

accurate treatment of $\tens{R}$ at the boundary (see condli)

1: true
0: false (default)

◆ itycor

itycor

type of rotation/curvature correction for an eddy viscosity turbulence models

1: Cazalbou correction (default when irccor = 1 and itytur = 2 or 5)
2: Spalart-Shur correction (default when irccor = 1 and iturb = 60 or 70)

◆ reinit_turb

reinit_turb

Advanced re-init for EBRSM and k-omega models

1: true
0: false (default)

◆ xlomlg

xlomlg

mixing length for the mixing length model

Useful if and only if iturb= 10 (mixing length).

The documentation for this struct was generated from the following files:

src/turb/cs_turbulence_model.h
src/turb/cs_turbulence_model.c

Data Fields