K location, index for specifying

(see KMON integer, Group 6)

K-Epsilon turbulence model

(also referred to as KE-EP)

KOND

KND2

KELIN

----- PIL integer; default=0; group 17 --- -

KELIN....is a parameter determining which linearization practice is used for the source terms of KE and EP. Although these practices make no difference to the final solution, they can considerably alter the rate at which the solution is achieved.

KELIN can take the values 0 (the default), 1, 2 and 3.

KELIN=1 is contrived so that it anticipates the effects of walls (near which production of turbulence approximately equals dissipation), and turbulent decay in shear-free zones.

KELIN=2 has proved of use in confined flows in which the turbulence level otherwise increases without control.

KELIN=3 is a strict Newton-Raphson linearization based on the presumption that the local length scale changes only slowly.

The FORTRAN embodiment of these linearizations is in Subroutine GXKESO of the open-source file GXTURB.FOR.

For KELIN=0, 1 and 2 the source terms per unit mass of fluid in the cell are given by:

  S_k = C_k (V_k-k)   and   S_e = C_e (V_e - e) 

where the values of C_k, V_k, C_e, and V_e are defined below: 

KELIN=0

C_k = n_t C_d /(L_m² C_m)                 V_k = E L_m² C_m/C_d               

C_e = C_2e C_d n_t /(C_m L_m²)             V_e = C_1e n_t E/C_2e

KELIN=1

C_k = C_2e C_m C_d k/n_t + n_t E/(2k)      

V_k = [(C_2e - 1) C_m C_d k²/n_t + 3n_t E/2 ]/ C_k

C_e = (2C_2e - 1) C_mC_d k/n_t               

V_e = [C_1e n_t E + (C_2e - 1) e ]/ (2C_2e - 1)

KELIN=2

C_k = C_mC_d k/n_t                  V_k = E n_t²/(kC_mC_d)                 

C_e = C_2eC_mC_d k/n_t               V_e = C_1e n_t E/C_2e

KELIN=3

For this option, the source terms per unit mass of fluid in the cell are given by:

S_k = C_k (V_k-k) + n_t E    and   S_e = C_e (V_e - e)  + C_1e e n_t E/k

where

   C_k = 3e /2k             V_k = k/3

   C_e = 4C_2e e/(3k)       V_e = e/4      

The setting of KELIN=3 automatically triggers whole-field storage of EPKE, the turbulent frequency e/k of the large-scale turbulent motion.

In the foregoing source-term expressions, L_m is the mixing length (provided in the store LEN1) and E is the mean rate of strain (provided in the store GEN1) defined by E= (U_i,j + U_j,i)² /2.                                          

K-Omega turbulence model

(also referred to as KE-OMEG)

See PHENC entry: K-Omega turbulence model

KE-EP

See K-EPSILON

KE-VO

See PHENC entry: Saffman-Spalding KE-VO model

Kinematic viscosity

(see VISL and VIST integer names, Group 7)

Kinetic-heating sources

KINETIC-heating sources for TEM1 & TEM2.

If TERMS(TEM1,Y,.... or TERMS(TEM2,Y,...., the kinetic- heating source terms become active in the same way as for enthalpy.

Warning: This may not always be desirable, for example when stress-analysis is being simulated and the velocity variables have the significance of displacements.

KMON

------ PIL integer; default=1; group 6 ----

KMON....index for specifying K location ( in BFC nomenclature ) at which the coordinates XC(IMON,JMON,KMON), YC(IMON,JMON,KMON), ZC(IMON,JMON,KMON) are displayed for sweep-by-sweep monitoring in the course of grid generation by the "Laplace solver", MAGIC(L).

KTFR

------- PIL integer; Default=0 ------------

Read only.

Zero location in F array for the storage of time distribution. It is used in SATLIT FORTRAN for accessing time distribution information.

KXFR

------- PIL integer; Default=0 ------------

Read only.

Zero location in F array for the storage of X direction grid distribution. It is used in SATLIT FORTRAN for accessing grid information.

KYFR

------- PIL integer; Default=0 ------------

Read only.

Zero location in F array for the storage of Y direction grid distribution. It is used in SATLIT FORTRAN for accessing grid information.

KZFR

------- PIL integer; Default=0 ------------

Read only.

Zero location in F array for the storage of Z direction grid distribution. It is used in SATLIT FORTRAN for accessing grid information.