Collaboration diagram for Module for physical constants:

Modules
	Module for turbulence constants

Variables
double precision	tkelvi
	Temperature in Kelvin correponding to 0 degrees Celsius (= +273,15) More...

double precision	tkelvn
	Temperature in degrees Celsius corresponding to 0 Kelvin (= -273,15) More...

double precision	xcal2j
	Calories (1 cvar_al = xcal2j J) More...

double precision	stephn
	Stephan constant for the radiative module $\sigma$ in $W.m^{-2}.K^{-4}$ . More...

double precision	rair
	Perfect gas constant for air (mixture) More...

real(c_double), pointer, save	cs_physical_constants_r
	Perfect gas constant in . More...

real(c_double), pointer, save	gx
	Gravity. More...

real(c_double), pointer, save	gy

real(c_double), pointer, save	gz

integer(c_int), pointer, save	icorio
	Coriolis effects. More...

integer(c_int), pointer, save	ixyzp0
	Physical constants of the fluid filling xyzp0 indicator. More...

integer(c_int), pointer, save	ieos
	indicates the equation of state for compressible module. Only perfect gas with a constant adiabatic coefficient, ieos=1 is available, but the user can complete the file cs_cf_thermo.h, which is not a user source, to add new equations of state. More...

integer(c_int), pointer, save	icp
	isobaric specific heat More...

integer(c_int), pointer, save	icv
	isochoric specific heat More...

real(c_double), pointer, save	ro0
	reference density. Negative value: not initialized. Its value is not used in gas or coal combustion modelling (it will be calculated following the perfect gas law, with and ). With the compressible module, it is also not used by the code, but it may be (and often is) referenced by the user in user subroutines; it is therefore better to specify its value. More...

real(c_double), pointer, save	viscl0
	reference molecular dynamic viscosity. Negative value: not initialized. More...

real(c_double), pointer, save	p0
	reference pressure for the total pressure. except with the compressible module, the total pressure is evaluated from the reduced pressure so that is equal to p0 at the reference position $\vect{x}_0$ (given by xyzp0). with the compressible module, the total pressure is solved directly. always Useful More...

real(c_double), pointer, save	pred0
	reference value for the reduced pressure (see ro0). It is especially used to initialise the reduced pressure and as a reference value for the outlet boundary conditions. For an optimised precision in the resolution of , it is wiser to keep pred0 to 0. With the compressible module, the "pressure" variable appearing in the equations directly represents the total pressure. It is therefore initialized to p0 and not pred0 (see ro0). Always useful, except with the compressible module More...

real(c_double), dimension(:), pointer, save	xyzp0
	coordinates of the reference point $\vect{x}_0$ for the total pressure. More...

real(c_double), pointer, save	t0
	reference temperature. More...

real(c_double), pointer, save	cp0
	reference specific heat. More...

real(c_double), pointer, save	cv0
	Reference isochoric specific heat. More...

real(c_double), pointer, save	psginf
	Stiffened gas (ieos=2) limit pressure (Pa) Equal to zero in perfect gas. More...

real(c_double), pointer, save	gammasg
	Stiffened gas (ieos=2) polytropic coefficient (dimensionless) More...

real(c_double), pointer, save	xmasmr
	Molar mass of the perfect gas in (if ieos=1) More...

real(c_double), pointer, save	pther
	Uniform thermodynamic pressure for the low-Mach algorithm Thermodynamic pressure for the current time step. More...

real(c_double), pointer, save	pthera
	Thermodynamic pressure for the previous time step. More...

real(c_double), pointer, save	pthermax
	pthermax: Thermodynamic maximum pressure for user clipping, used to model a venting effect More...

Detailed Description

Variable Documentation

real(c_double), pointer, save cp0

reference specific heat.

Useful if there is 1 <= n <= nscaus, so that iscalt = n and itherm = 1 (there is a "temperature" scalar), unless the user specifies the specific heat in the user subroutine usphyv (icp > 0) with the compressible module or coal combustion, cp0 is also needed even when there is no user scalar.

Note: None of the scalars from the specific physics is a temperature.; When using the Graphical Interface, cp0 is also used to calculate the diffusivity of the thermal scalars, based on their conductivity; it is therefore needed, unless the diffusivity is also specified in usphyv.

real(c_double), pointer, save cs_physical_constants_r

Perfect gas constant in $J/mol/K$ .

real(c_double), pointer, save cv0

Reference isochoric specific heat.

Useful for the compressible module (J/kg/K)

real(c_double), pointer, save gammasg

Stiffened gas (ieos=2) polytropic coefficient (dimensionless)

real(c_double), pointer, save gx

Gravity.

real(c_double), pointer, save gy

real(c_double), pointer, save gz

integer(c_int), pointer, save icorio

Coriolis effects.

integer(c_int), pointer, save icp

isobaric specific heat $ C_p $

integer(c_int), pointer, save icv

isochoric specific heat $ C_v $

integer(c_int), pointer, save ieos

indicates the equation of state for compressible module. Only perfect gas with a constant adiabatic coefficient, ieos=1 is available, but the user can complete the file cs_cf_thermo.h, which is not a user source, to add new equations of state.

integer(c_int), pointer, save ixyzp0

Physical constants of the fluid filling xyzp0 indicator.

real(c_double), pointer, save p0

reference pressure for the total pressure. except with the compressible module, the total pressure $P$ is evaluated from the reduced pressure $P^*$ so that $P$ is equal to p0 at the reference position $\vect{x}_0$ (given by xyzp0). with the compressible module, the total pressure is solved directly. always Useful

real(c_double), pointer, save pred0

reference value for the reduced pressure $P^*$ (see ro0). It is especially used to initialise the reduced pressure and as a reference value for the outlet boundary conditions. For an optimised precision in the resolution of $P^*$ , it is wiser to keep pred0 to 0. With the compressible module, the "pressure" variable appearing in the equations directly represents the total pressure. It is therefore initialized to p0 and not pred0 (see ro0). Always useful, except with the compressible module

real(c_double), pointer, save psginf

Stiffened gas (ieos=2) limit pressure (Pa) Equal to zero in perfect gas.

real(c_double), pointer, save pther

Uniform thermodynamic pressure for the low-Mach algorithm Thermodynamic pressure for the current time step.

real(c_double), pointer, save pthera

Thermodynamic pressure for the previous time step.

real(c_double), pointer, save pthermax

pthermax: Thermodynamic maximum pressure for user clipping, used to model a venting effect

double precision rair

Perfect gas constant for air (mixture)

real(c_double), pointer, save ro0

reference density. Negative value: not initialized. Its value is not used in gas or coal combustion modelling (it will be calculated following the perfect gas law, with $P0$ and $T0$ ). With the compressible module, it is also not used by the code, but it may be (and often is) referenced by the user in user subroutines; it is therefore better to specify its value.

Always useful otherwise, even if a law defining the density is given by the user subroutines usphyv or uselph. indeed, except with the compressible module, CS does not use the total pressure $P$ when solving the Navier-Stokes equation, but a reduced pressure . $P^*=P-\rho_0\vect{g}.(\vect{x}-\vect{x}_0)+P^*_0-P_0$ . where $\vect{x_0}$ is a reference point (see xyzp0) and $P^*_0$ and $P_0$ are reference values (see pred0 and p0). Hence, the term $-\grad{P}+\rho\vect{g}$ in the equation is treated as $-\grad{P^*}+(\rho-\rho_0)\vect{g}$ . The closer ro0 is to the value of $\rho$ , the more $P^*$ will tend to represent only the dynamic part of the pressure and the faster and more precise its solution will be. Whatever the value of ro0, both $P$ and $P^*$ appear in the listing and the post-processing outputs.. with the compressible module, the calculation is made directly on the total pressure

double precision stephn

Stephan constant for the radiative module $\sigma$ in $W.m^{-2}.K^{-4}$ .

real(c_double), pointer, save t0

reference temperature.

Useful for the specific physics gas or coal combustion (initialization of the density), for the electricity modules to initialize the domain temperature and for the compressible module (initializations). It must be given in Kelvin.

double precision tkelvi

Temperature in Kelvin correponding to 0 degrees Celsius (= +273,15)

double precision tkelvn

Temperature in degrees Celsius corresponding to 0 Kelvin (= -273,15)

real(c_double), pointer, save viscl0

reference molecular dynamic viscosity. Negative value: not initialized.

Always useful, it is the used value unless the user specifies the viscosity in the subroutine usphyv

double precision xcal2j

Calories (1 cvar_al = xcal2j J)

real(c_double), pointer, save xmasmr

Molar mass of the perfect gas in $ kg/mol $ (if ieos=1)

Always useful

real(c_double), dimension(:), pointer, save xyzp0

coordinates of the reference point $\vect{x}_0$ for the total pressure.

When there are no Dirichlet conditions for the pressure (closed domain), xyzp0 does not need to be specified (unless the total pressure has a clear physical meaning in the configuration treated).
When Dirichlet conditions on the pressure are specified but only through stantard outlet conditions (as it is in most configurations), xyzp0 does not need to be specified by the user, since it will be set to the coordinates of the reference outlet face (i.e. the code will automatically select a reference outlet boundary face and set xyzp0 so that equals p0 at this face). Nonetheless, if xyzp0 is specified by the user, the calculation will remain correct.
When direct Dirichlet conditions are specified by the user (specific value set on specific boundary faces), it is better to specify the corresponding reference point (i.e. specify where the total pressure is p0). This way, the boundary conditions for the reduced pressure will be close to pred0, ensuring an optimal precision in the resolution. If xyzp0 is not specified, the reduced pressure will be shifted, but the calculations will remain correct..
With the compressible module, the "pressure" variable appearing in the equations directly represents the total pressure. xyzp0 is therefore not used..

Always useful, except with the compressible module.

Modules

Variables

Detailed Description

Variable Documentation