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adding function computeConnectionDensities to StandardWell

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which is copied from WellDensitySegmented, while avoid using of the
Wells struct.

TODO: find a better place to put these long functions.
This commit is contained in:
Kai Bao
2017-06-23 15:54:05 +02:00
parent 20c36d19c1
commit 9514e44d13
2 changed files with 106 additions and 0 deletions
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98
opm/autodiff/StandardWell_impl.hpp
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@@ -1524,4 +1524,102 @@ namespace Opm
}
}
template<typename TypeTag>
void
StandardWell<TypeTag>::
computeConnectionDensities(const std::vector<double>& perfComponentRates,
const std::vector<double>& b_perf,
const std::vector<double>& rsmax_perf,
const std::vector<double>& rvmax_perf,
const std::vector<double>& surf_dens_perf)
{
// Verify that we have consistent input.
const int np = numberOfPhases();
const int nperf = numberOfPerforations();
const int num_comp = numComponents();
const PhaseUsage* phase_usage = phase_usage_;
// 1. Compute the flow (in surface volume units for each
// component) exiting up the wellbore from each perforation,
// taking into account flow from lower in the well, and
// in/out-flow at each perforation.
std::vector<double> q_out_perf(nperf*num_comp);
// TODO: investigate whether we should use the following techniques to calcuate the composition of flows in the wellbore
// Iterate over well perforations from bottom to top.
for (int perf = nperf - 1; perf >= 0; --perf) {
for (int component = 0; component < num_comp; ++component) {
if (perf == nperf - 1) {
// This is the bottom perforation. No flow from below.
q_out_perf[perf*num_comp+ component] = 0.0;
} else {
// Set equal to flow from below.
q_out_perf[perf*num_comp + component] = q_out_perf[(perf+1)*num_comp + component];
}
// Subtract outflow through perforation.
q_out_perf[perf*num_comp + component] -= perfComponentRates[perf*num_comp + component];
}
}
// 2. Compute the component mix at each perforation as the
// absolute values of the surface rates divided by their sum.
// Then compute volume ratios (formation factors) for each perforation.
// Finally compute densities for the segments associated with each perforation.
const int gaspos = phase_usage->phase_pos[BlackoilPhases::Vapour];
const int oilpos = phase_usage->phase_pos[BlackoilPhases::Liquid];
std::vector<double> mix(num_comp,0.0);
std::vector<double> x(num_comp);
std::vector<double> surf_dens(num_comp);
std::vector<double> dens(nperf);
for (int perf = 0; perf < nperf; ++perf) {
// Find component mix.
const double tot_surf_rate = std::accumulate(q_out_perf.begin() + num_comp*perf,
q_out_perf.begin() + num_comp*(perf+1), 0.0);
if (tot_surf_rate != 0.0) {
for (int component = 0; component < num_comp; ++component) {
mix[component] = std::fabs(q_out_perf[perf*num_comp + component]/tot_surf_rate);
}
} else {
// No flow => use well specified fractions for mix.
for (int phase = 0; phase < np; ++phase) {
mix[phase] = compFrac()[phase];
}
// intialize 0.0 for comIdx >= np;
}
// Compute volume ratio.
x = mix;
double rs = 0.0;
double rv = 0.0;
if (!rsmax_perf.empty() && mix[oilpos] > 0.0) {
rs = std::min(mix[gaspos]/mix[oilpos], rsmax_perf[perf]);
}
if (!rvmax_perf.empty() && mix[gaspos] > 0.0) {
rv = std::min(mix[oilpos]/mix[gaspos], rvmax_perf[perf]);
}
if (rs != 0.0) {
// Subtract gas in oil from gas mixture
x[gaspos] = (mix[gaspos] - mix[oilpos]*rs)/(1.0 - rs*rv);
}
if (rv != 0.0) {
// Subtract oil in gas from oil mixture
x[oilpos] = (mix[oilpos] - mix[gaspos]*rv)/(1.0 - rs*rv);;
}
double volrat = 0.0;
for (int component = 0; component < num_comp; ++component) {
volrat += x[component] / b_perf[perf*num_comp+ component];
}
for (int component = 0; component < num_comp; ++component) {
surf_dens[component] = surf_dens_perf[perf*num_comp+ component];
}
// Compute segment density.
perf_densities_[perf] = std::inner_product(surf_dens.begin(), surf_dens.end(), mix.begin(), 0.0) / volrat;
}
}
}