100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
//! @file vcs_TP.cpp
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#include "cantera/equil/vcs_solve.h"
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#include "cantera/equil/vcs_VolPhase.h"
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namespace Cantera
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{
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int VCS_SOLVE::vcs_TP(int ipr, int ip1, int maxit, double T_arg, double pres_arg)
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{
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/*
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* Store the temperature and pressure in the private global variables
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*/
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m_temperature = T_arg;
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m_pressurePA = pres_arg;
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/*
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* Evaluate the standard state free energies
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* at the current temperatures and pressures.
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*/
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int iconv = vcs_evalSS_TP(ipr, ip1, m_temperature, pres_arg);
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/*
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* Prepare the problem data:
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* ->nondimensionalize the free energies using
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* the divisor, R * T
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*/
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vcs_nondim_TP();
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/*
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* Prep the fe field
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*/
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vcs_fePrep_TP();
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/*
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* Decide whether we need an initial estimate of the solution
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* If so, go get one. If not, then
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*/
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if (m_doEstimateEquil) {
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int retn = vcs_inest_TP();
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if (retn != VCS_SUCCESS) {
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plogf("vcs_inest_TP returned a failure flag\n");
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}
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}
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/*
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* Solve the problem at a fixed Temperature and Pressure
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* (all information concerning Temperature and Pressure has already
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* been derived. The free energies are now in dimensionless form.)
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*/
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iconv = vcs_solve_TP(ipr, ip1, maxit);
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/*
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* Redimensionalize the free energies using
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* the reverse of vcs_nondim to add back units.
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*/
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vcs_redim_TP();
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/*
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* Return the convergence success flag.
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*/
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return iconv;
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}
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int VCS_SOLVE::vcs_evalSS_TP(int ipr, int ip1, double Temp, double pres)
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{
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/*
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* We need to special case VCS_UNITS_UNITLESS, here.
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* cpc_ts_GStar_calc() returns units of Kelvin. Also, the temperature
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* comes into play in calculating the ideal equation of state
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* contributions, and other equations of state also. Therefore,
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* we will emulate the VCS_UNITS_KELVIN case, here by changing
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* the initial Gibbs free energy units to Kelvin before feeding
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* them to the cpc_ts_GStar_calc() routine. Then, we will revert
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* them back to unitless at the end of this routine.
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*/
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for (size_t iph = 0; iph < m_numPhases; iph++) {
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vcs_VolPhase* vph = m_VolPhaseList[iph];
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vph->setState_TP(m_temperature, m_pressurePA);
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vph->sendToVCS_GStar(&m_SSfeSpecies[0]);
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}
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if (m_VCS_UnitsFormat == VCS_UNITS_UNITLESS) {
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for (size_t i = 0; i < m_numSpeciesTot; ++i) {
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m_SSfeSpecies[i] /= Temp;
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}
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}
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return VCS_SUCCESS;
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}
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void VCS_SOLVE::vcs_fePrep_TP(void)
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{
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for (size_t i = 0; i < m_numSpeciesTot; ++i) {
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/*
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* For single species phases, initialize the chemical
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* potential with the value of the standard state chemical
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* potential. This value doesn't change during the calculation
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*/
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if (m_SSPhase[i]) {
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m_feSpecies_old[i] = m_SSfeSpecies[i];
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m_feSpecies_new[i] = m_SSfeSpecies[i];
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}
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}
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}
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}
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