Collaboration diagram for Compressible models options:

Topics
	Homogeneous two-phase compressible model options

Data Types
struct	cs_cf_model_t
	Compressible model general options descriptor. More...

Variables
integer, save	ienerg = 0
	specific total energy for compressible algorithm
integer, save	itempk = 0
	temperature deduced from the specific total energy
int	ieos
int	ithvar
int	icfgrp
double	psginf
double	gammasg

Detailed Description

\ defgroup compressible Compressible models options

Variable Documentation

◆ gammasg

double gammasg

stiffened gas polytropic coefficient (dimensionless) for single phase model

◆ icfgrp

int icfgrp

indicator for hydrostatic balance in boundary conditions

In the cases where gravity is predominant, taking into account the hydrostatic pressure allows to get rid of perturbations which may appear near the horizontal walls when the flow is weakly convective.

Otherwise, when icfgrp=0, the pressure condition is calculated from the solution of the unidimensional Euler equations for a perfect gas near a wall, for the variables "normal velocity", "density" and "pressure":

Case of an expansion (M <= 0):

$\begin{align*} P_p &= 0 & \textrm{if } 1 + \displaystyle\frac{\gamma-1}{2}M<0 \\ P_p &= P_i \left(1 + \displaystyle\frac{\gamma-1}{2}M\right) ^{\frac{2\gamma}{\gamma-1}} & \textrm{otherwise} \end{align*}$

Case of a schock (M > 0):

$\begin{eqnarray*} P_p = P_i \left(1 + \displaystyle\frac{\gamma(\gamma+1)}{4}M^2 +\gamma M \displaystyle\sqrt{1+\displaystyle\frac{(\gamma+1)^2}{16}M^2}\right) \end{eqnarray*}$

with $M = \displaystyle\frac{\vect{u}_i \cdot \vect{n}}{c_i}$ , internal Mach number calculated with the variables taken in the cell.

◆ ienerg

integer, save ienerg = 0

specific total energy for compressible algorithm

◆ ieos

int ieos

indicator of equation of state

CS_EOS_IDEAL_GAS: ideal gas with a constant adiabatic coefficient
CS_EOS_STIFFENED_GAS: stiffened gas
CS_EOS_GAS_MIX: mix of ideal gas
CS_EOS_HOMOGENEOUS_TWO_PHASE: two-phase homogeneous model only, each phase follows a stiffened gas law.
CS_EOS_MOIST_AIR: moist air equation of state with condensable (mixture of two ideal gas)

◆ itempk

integer, save itempk = 0

temperature deduced from the specific total energy

◆ ithvar

int ithvar

indicator for thermodynamic variables initialization

◆ psginf

double psginf

stiffened gas limit pressure (zero in perfect gas) for single phase model in Pa

Topics

Data Types

Variables