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Merge pull request #5342 from atgeirr/nldd-domain-solves-newton-damping

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Add Newton update damping when domain solution oscillates.
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Bård Skaflestad 2024-06-06 14:52:25 +02:00 committed by GitHub
commit bc48a2e955
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1 changed files with 23 additions and 0 deletions
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opm/simulators/flow/BlackoilModelNldd.hpp
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@ -33,6 +33,7 @@
#include <opm/simulators/flow/countGlobalCells.hpp>
#include <opm/simulators/flow/partitionCells.hpp>
#include <opm/simulators/flow/priVarsPacking.hpp>
#include <opm/simulators/flow/NonlinearSolver.hpp>
#include <opm/simulators/flow/SubDomain.hpp>
#include <opm/simulators/linalg/extractMatrix.hpp>
@ -353,6 +354,7 @@ public:
}
private:
//! \brief Solve the equation system for a single domain.
std::pair<SimulatorReportSingle, ConvergenceReport>
solveDomain(const Domain& domain,
@ -411,6 +413,10 @@ private:
// Local Newton loop.
const int max_iter = model_.param().max_local_solve_iterations_;
const auto& grid = modelSimulator.vanguard().grid();
double damping_factor = 1.0;
std::vector<std::vector<Scalar>> convergence_history;
convergence_history.reserve(20);
convergence_history.push_back(resnorms);
do {
// Solve local linear system.
// Note that x has full size, we expect it to be nonzero only for in-domain cells.
@ -420,6 +426,9 @@ private:
detailTimer.start();
this->solveJacobianSystemDomain(domain, x);
model_.wellModel().postSolveDomain(x, domain);
if (damping_factor != 1.0) {
x *= damping_factor;
}
report.linear_solve_time += detailTimer.stop();
report.linear_solve_setup_time += model_.linearSolveSetupTime();
report.total_linear_iterations = model_.linearIterationsLastSolve();
@ -447,7 +456,9 @@ private:
// Check for local convergence.
detailTimer.reset();
detailTimer.start();
resnorms.clear();
convreport = this->getDomainConvergence(domain, timer, iter, logger, resnorms);
convergence_history.push_back(resnorms);
// apply the Schur complement of the well model to the
// reservoir linearized equations
@ -459,6 +470,18 @@ private:
const double tt2 = detailTimer.stop();
report.assemble_time += tt2;
report.assemble_time_well += tt2;
// Check if we should dampen. Only do so if wells are converged.
if (!convreport.converged() && !convreport.wellFailed()) {
bool oscillate = false;
bool stagnate = false;
const int numPhases = convergence_history.front().size();
detail::detectOscillations(convergence_history, iter, numPhases, 0.2, 1, oscillate, stagnate);
if (oscillate) {
damping_factor *= 0.85;
logger.debug(fmt::format("| Damping factor is now {}", damping_factor));
}
}
} while (!convreport.converged() && iter <= max_iter);
modelSimulator.problem().endIteration();