09a06be1a4
Conflicts: src/thermophysicalModels/basic/derivedFvPatchFields/fixedEnthalpy/fixedEnthalpyFvPatchScalarField.C src/thermophysicalModels/basic/derivedFvPatchFields/gradientEnthalpy/gradientEnthalpyFvPatchScalarField.C src/thermophysicalModels/basic/derivedFvPatchFields/mixedEnthalpy/mixedEnthalpyFvPatchScalarField.C
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/*
|
|
freesteam - IAPWS-IF97 steam tables library
|
|
Copyright (C) 2004-2009 John Pye
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/*
|
|
Based on IAPWS Formulation 2008 for the Viscosity of Ordinary Water Substance
|
|
*/
|
|
|
|
#define FREESTEAM_BUILDING_LIB
|
|
#include "viscosity.h"
|
|
|
|
static double mu0(double tau);
|
|
static double mu1(double del, double tau);
|
|
|
|
#define VISCOSITY_MUSTAR 1.0e-6 /* Pa-s */
|
|
|
|
#include <math.h>
|
|
|
|
static double mu0(double tau){
|
|
// viscosity in the dilute-gas limit
|
|
const double H[4] = {1.67752, 2.20462, 0.6366564, -0.241605};
|
|
int i;
|
|
double sum = 0;
|
|
for (i = 0; i < 4; i++){
|
|
sum += H[i] * ipow(tau, i) ;
|
|
}
|
|
return 100.0 / (sqrt(tau) * sum);
|
|
}
|
|
|
|
|
|
|
|
static double mu1(double del, double tau){
|
|
// contribution to viscosity due to finite density
|
|
const double H[6][7] = {
|
|
{ 5.20094E-1, 2.22531E-1, -2.81378E-1, 1.61913E-1, -3.25372E-2, 0.0, 0.0},
|
|
{ 8.50895E-2, 9.99115E-1, -9.06851E-1, 2.57399E-1, 0.0, 0.0, 0.0},
|
|
{-1.08374, 1.88797, -7.72479E-1, 0.0, 0.0, 0.0, 0.0},
|
|
{-2.89555E-1, 1.26613, -4.89837E-1, 0.0, 6.98452E-2, 0.0, -4.35673E-3},
|
|
{ 0.0, 0.0, -2.57040E-1, 0.0, 0.0, 8.72102E-3, 0.0},
|
|
{ 0.0, 1.20573E-1, 0.0, 0.0, 0.0, 0.0, -5.93264E-4}
|
|
};
|
|
|
|
int i, j;
|
|
double sum = 0;
|
|
double tau1 = 0;
|
|
for (i = 0; i < 6; i++){
|
|
tau1 = ipow(tau - 1, i);
|
|
for (j = 0; j < 7; j++){
|
|
if(0==H[i][j])continue;
|
|
sum += H[i][j] * tau1 * ipow(del - 1, j);
|
|
}
|
|
}
|
|
return exp(del * sum);
|
|
}
|
|
|
|
double freesteam_mu_rhoT(double rho, double T){
|
|
double del = rho / IAPWS97_RHOCRIT;
|
|
double tau = IAPWS97_TCRIT / T;
|
|
|
|
const int mu2 = 1; // critical enhancement to viscosity not implemented for IF-97, set to 1
|
|
return VISCOSITY_MUSTAR * mu0(tau) * mu1(del,tau) * mu2;
|
|
}
|
|
|