TURBULENCE_MODEL_PARAMETERS

Specifies constants and parameters for turbulence models.

Type

AcuSolve Command

Syntax

TURBULENCE_MODEL_PARAMETERS {parameters...}

Qualifier

This command has no qualifier.

Parameters

spalart_allmaras_cb1 (real) >=0 [=0.1355]
Spalart-Allmaras model constant.
spalart_allmaras_cb2 (real) >=0 [=0.622]
Spalart-Allmaras model constant.
spalart_allmaras_sigma (real) >=0 [=0.66666666667]
Spalart-Allmaras model constant.
spalart_allmaras_cw1 (real) >=0 [=3.23906781678]
Spalart-Allmaras model constant.
spalart_allmaras_cw2 (real) >=0 [=0.3]
Spalart-Allmaras model constant.
spalart_allmaras_cw3 (real) >=0 [=2]
Spalart-Allmaras model constant.
spalart_allmaras_cv1 (real) >=0 [=7.1]
Spalart-Allmaras model constant.
spalart_allmaras_rotation_curvature (boolean) [=on]
Turn on/off rotation-curvature correction (SA-RC).
spalart_allmaras_cr1 (real) >=0 [=1]
Spalart-Allmaras rotation-curvature correction (SA-RC) constant.
spalart_allmaras_cr2 (real) >=0 [=12]
Spalart-Allmaras rotation-curvature correction (SA-RC) constant.
spalart_allmaras_cr3 (real) >=0 [=1]
Spalart-Allmaras rotation-curvature correction (SA-RC) constant.
spalart_allmaras_qcr (boolean) [=off]
Turn on/off Spalart-Allmaras Quadratic Constitutive Relation (SA-RC) model.
spalart_allmaras_qcr_cr1 (real) >=0 [=0.3]
Spalart-Allmaras Quadratic Constitutive Relation (SA-RC) constant.
spalart_allmaras_qcr_cr2 (real) >=0 [=2.5]
Spalart-Allmaras Quadratic Constitutive Relation (SA-QCR) constant.
spalart_allmaras_des_type (enumerated) [=ddes]
Spalart-Allmaras Detached Eddy Simulation (SA-DES) model type.
des97
Spalart's Detached Eddy Simulation model.
ddes
Delayed DES model.
iddes
Improved Delayed DES (IDDES) model.
spalart_allmaras_des_constant (real) >=0 [=0.25]
SA-DES model constant applicable to des97 and ddes model types.
spalart_allmaras_iddes_cl >=0 [=3.55] (real)
SA-IDDES model constant.
spalart_allmaras_iddes_ct >=0 [=1.63] (real)
SA-IDDES model constant.
spalart_allmaras_iddes_cw (real) >=0 [=0.15]
SA-IDDES model constant.
sst_a1 (real) >=0 [=0.31]
Shear-Stress Transport (SST) model constant.
sst_betastar (real) >=0 [=0.09]
SST model constant.
sst_sigmak1 (real) >=0 [=0.85]
SST model constant.
sst_sigmak2 (real) >=0 [=1]
SST model constant.
sst_sigmao1 (real) >=0 [=0.5]
SST model constant.
sst_sigmao2 (real) >=0 [=0.856]
SST model constant.
sst_beta1 (real) >=0 [=0.075]
SST model constant.
sst_beta2 (real) >=0 [=0.0828]
SST model constant.
sst_gamma1 (real) >=0 [=0.55555555556]
SST model constant.
sst_gamma2 (real) >=0 [=0.44]
SST model constant.
sst_des_constant_1 (real) >=0 [=0.78]
SST-DES model constant.
sst_des_constant_2 (real) >=0 [=0.61]
SST-DES model constant.
sst_production_type (enumerated) [=sst_2003]
SST Production term type.
sst_2003
SST model based on Menter et al., 2003.
sst_rotation_curvature (boolean) [=off]
Turn on/off rotation curvature correction for SST model.
sst_des_type (enumerated) [=ddes]
SST DES model type.
zonal
Zonal DES model.
ddes
Delayed DES model.
iddes
Improved Delayed DES (IDDES) model.
sst_wall_function_type (enumerated) [=all_yplus]
Wall function type.
all_yplus
Wall y+ independent wall function.
k_epsilon_cmu (real) >=0 [=0.09]
Standard K-Epsilon model constant.
k_epsilon_ce1 (real) >=0 [=1.44]
Standard K-Epsilon model constant.
k_epsilon_ce2 (real) >=0 [=1.92]
Standard K-Epsilon model constant.
k_epsilon_sigmak (real) >=0 [=1]
Standard K-Epsilon model constant.
k_epsilon_sigmae (real) >=0 [=1.3]
Standard K-Epsilon model constant.
rng_k_epsilon_cmu (real) >=0 [=0.0845]
ReNormalization Group (RNG) K-Epsilon model constant.
rng_k_epsilon_ce1 (real) >=0 [=1.42]
RNG K-Epsilon model constant.
rng_k_epsilon_ce2 (real) >=0 [=1.92]
RNG K-Epsilon model constant.
rng_k_epsilon_sigmak (real) >=0 [=0.7194]
RNG K-Epsilon model constant.
rng_k_epsilon_sigmae (real) >=0 [=0.7194]
RNG K-Epsilon model constant.
rng_k_epsilon_eta0 (real) >=0 [=4.38]
RNG K-Epsilon model constant.
rng_k_epsilon_beta (real) >=0 [=0.012]
RNG K-Epsilon model constant.
Realizable_k_epsilon_ce1 (real) >=0 [=0.43]
Realizable K-Epsilon model constant.
Realizable_k_epsilon_ce2 (real) >=0 [=1.9]
Realizable K-Epsilon model constant.
Realizable_k_epsilon_sigmak (real) >=0 [=1]
Realizable K-Epsilon model constant.
Realizable_k_epsilon_sigmae (real) >=0 [=1.2]
Realizable K-Epsilon model constant.
Realizable_k_epsilon_eta0 (real) >=0 [=5]
Realizable K-Epsilon model constant.
Realizable_k_epsilon_a0 (real) >=0 [=4.04]
Realizable K-Epsilon model constant.
k_epsilon_twolayer_restar (real) >=0 [=200]
K-Epsilon two-layer wall-function model constant controlling blending layer location.
k_epsilon_twolayer_redelta (real) >=0 [=20]
K-Epsilon two-layer wall-function model constant controlling blending thickness.
k_epsilon_wall_function_type (enumerated) (=two_layer)
Wall function type.
standard
Standard wall-function with first-layer y+ in the log-layer only.
two_layer
Wolfstein two-layer wall-function with all y+ first-layer height.
k_epsilon_realizability_constraint boolean [=on]
Turn on/off Durbin's realizability constraint. Corrects the stagnation point anomaly and improves robustness.
k_omega_alpha (real) >=0 [=0.52]
Wilcox k-omega model constant.
k_omega_betao (real) >=0 [=0.0708]
Wilcox k-omega model constant.
k_omega_clim (real) >=0 [=0.875]
Wilcox k-omega model constant.
k_omega_sigmak (real) >=0 [=0.6]
Wilcox k-omega model constant.
k_omega_sigmao (real) >=0 [=0.5]
Wilcox k-omega model constant.
k_omega_sigmado (real) >=0 [=0.125]
Wilcox k-omega model constant.
k_omega_rotation_curvature (boolean) [=off]
Turn on/off rotation-curvature correction for Wilcox k-omega model.
k_omega_des_constant (real) >=0 [=0.61]
K-omega DES model constants.
bsl_betastar (real) >=0 [=0.09]
Menter's baseline (BSL) K-omega model constant.
bsl_sigmak1 (real) >=0 [=0.5]
BSL K-omega model constant.
bsl_sigmak2 (real) >=0 [=1]
BSL K-omega model constant.
bsl_sigmao1 (real) >=0 [=0.5]
BSL K-omega model constant.
bsl_sigmao2 (real) >=0 [=0.856]
BSL K-omega model constant.
bsl_beta1 (real) >=0 [=0.075]
BSL K-omega model constant.
bsl_beta2 (real) >=0 [=0.0828]
BSL K-omega model constant.
bsl_gamma1 (real) >=0 [=0.55555555556]
BSL K-omega model constant.
bsl_gamma2 (real) >=0 [=0.44]
BSL K-omega model constant.
smagorinsky_constant (real) >=0 [=0.04]
Smagorinsky constant used in Large Eddy Simulation (LES) model.
dynamic_subgrid_model_type (enumerated) [=mij]
Dynamic Subgrid Model type.
kolmogorov
Kolmogorov model.
mij
Mij model.
synthetic_turbulence_input_type or synles (enumerated) (=none)
Large Eddy Simulation (LES) synthetic turbulence inflow type.
none
Deactivate synthetic turbulence flow.
k_omega
Provide k profiles and omega profiles at synthetic inflow.
k_epsilon
Provide k profiles and epsilon profiles at synthetic inflow.
film_coefficient_yplus (real) > 0 [=100]
Value of y+ used to evaluate non-dimensional temperature in surface_film_coefficient.
von_karman_constant (real) >=0 [=0.41]
Von Kármán constant used in logarithmic law describing a turbulent boundary layer's velocity profile.
intermittency_ctu1 (real) [=100]
Intermittency equation constant for Gamma transition model.
intermittency_ctu2 (real) [=1000]
Intermittency equation constant for Gamma transition model.
intermittency_ctu3 (real) [=1]
Intermittency equation constant for Gamma transition model.
intermittency_cpg1 (real) [=14.68]
Intermittency equation constant for Gamma transition model.
intermittency_cpg2 (real) [=-7.34]
Intermittency equation constant for Gamma transition model.
intermittency_cpg3 (real) [=0]
Intermittency equation constant for Gamma transition model.
retheta_critical_type (enumerated) [=default]
Critical Re-Theta correlation type.
default
Default value.
user_function
User-defined function.
retheta_critical_user_function (string) [=]
Name of the user-defined function. Used when retheta_critical_type = user_function.
retheta_critical_user_values (array) [={ }]
Array of values to be passed to the user-defined function. Used with retheta_critical_user_function type.
retheta_critical_user_strings (array) [={ }]
Array of strings to be passed to the user-defined function. Used with retheta_critical_user_function type.
flength_type (enumerated) [=default]
F-Length correlation type.
default
Default value.
user_function
User-defined function.
flength_user_function (string) [=]
Name of the user-defined function. Used when flength_type = user_function.
flength_user_values (array) [={ }]
Array of values to be passed to the user-defined function. Used with flength_user_function type.
flength_user_strings (array) [={ }]
Array of strings to be passed to the user-defined function. Used with flength_user_function type.

Description

This command modifies the turbulence model constants and parameters to the user desired quantity or option from the default selection. For example,
TURBULENCE_MODEL_PARAMETERS {
    k_epsilon_cmu = 0.1
}

modifies the standard k-epsilon turbulence model constant c μ from its default value of 0.09 to 0.1.

Similarly, for Boolean options, example:
TURBULENCE_MODEL_PARAMETERS {
    sst_rotation_curvature = on
}

turns on rotation-curvature correction for the SST model.

The synthetic turbulence feature accepts two types of inflow profiles: K-Omega and K-Epsilon. For example,
TURBULENCE_MODEL_PARAMETERS {
    Synthetic_turbulence_input_type = k_omega
}

This command is only active when large_eddy_simulation or dynamic_model is chosen at the turbulence command and inflow type is set to velocity or atmospheric. If the k_omega option is set, then corresponding turbulent kinetic energy and turbulent eddy frequency profiles (or values) need to be specified at inflow to generate synthetic turbulence. If k-epsilon is chosen, then turbulent kinetic energy and turbulent dissipation rate profiles (or values) are required to be set at inflow.