27#ifndef OPM_IAPWS_REGION4_HPP
28#define OPM_IAPWS_REGION4_HPP
50template <
class Scalar>
62 template <
class Evaluation>
65 static const Scalar n[10] = {
66 0.11670521452767e4, -0.72421316703206e6, -0.17073846940092e2,
67 0.12020824702470e5, -0.32325550322333e7, 0.14915108613530e2,
68 -0.48232657361591e4, 0.40511340542057e6, -0.23855557567849,
72 const Evaluation& sigma = temperature + n[8]/(temperature - n[9]);
74 const Evaluation& A = (sigma + n[0])*sigma + n[1];
75 const Evaluation& B = (n[2]*sigma + n[3])*sigma + n[4];
76 const Evaluation& C = (n[5]*sigma + n[6])*sigma + n[7];
78 Evaluation tmp = 2*C/(
sqrt(B*B - 4*A*C) - B);
93 template <
class Evaluation>
96 static const Scalar n[10] = {
97 0.11670521452767e4, -0.72421316703206e6, -0.17073846940092e2,
98 0.12020824702470e5, -0.32325550322333e7, 0.14915108613530e2,
99 -0.48232657361591e4, 0.40511340542057e6, -0.23855557567849,
102 const Evaluation& beta =
pow((pressure/1e6 ), (1./4.));
103 const Evaluation& beta2 =
pow(beta, 2.);
104 const Evaluation& E = beta2 + n[2] * beta + n[5];
105 const Evaluation& F = n[0]*beta2 + n[3]*beta + n[6];
106 const Evaluation& G = n[1]*beta2 + n[4]*beta + n[7];
108 const Evaluation& D = ( 2.*G)/(-F -
sqrt(
pow(F,2.) - 4.*E*G));
110 const Evaluation& temperature = (n[9] + D -
sqrt(
pow(n[9]+D , 2.) - 4.* (n[8] + n[9]*D)) ) * 0.5;
Implements the equations for region 4 of the IAPWS '97 formulation.
Definition: Region4.hpp:52
static Evaluation vaporTemperature(const Evaluation &pressure)
Returns the saturation temperature in of pure water at a given pressure.
Definition: Region4.hpp:94
static Evaluation saturationPressure(const Evaluation &temperature)
Returns the saturation pressure in of pure water at a given temperature.
Definition: Region4.hpp:63
Definition: Air_Mesitylene.hpp:34
Evaluation sqrt(const Evaluation &value)
Definition: MathToolbox.hpp:399
ReturnEval_< Evaluation1, Evaluation2 >::type pow(const Evaluation1 &base, const Evaluation2 &exp)
Definition: MathToolbox.hpp:416