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https://github.com/OPM/opm-simulators.git
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220 lines
8.4 KiB
C++
220 lines
8.4 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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*
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* \copydoc Opm::NcpNewtonMethod
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*/
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#ifndef EWOMS_NCP_NEWTON_METHOD_HH
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#define EWOMS_NCP_NEWTON_METHOD_HH
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#include "ncpproperties.hh"
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#include <opm/common/Exceptions.hpp>
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#include <opm/models/nonlinear/newtonmethod.hh>
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#include <algorithm>
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namespace Opm::Properties {
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template <class TypeTag, class MyTypeTag>
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struct DiscNewtonMethod;
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} // namespace Opm::Properties
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namespace Opm {
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/*!
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* \ingroup NcpModel
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*
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* \brief A Newton solver specific to the NCP model.
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*/
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template <class TypeTag>
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class NcpNewtonMethod : public GetPropType<TypeTag, Properties::DiscNewtonMethod>
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{
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using ParentType = GetPropType<TypeTag, Properties::DiscNewtonMethod>;
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using EqVector = GetPropType<TypeTag, Properties::EqVector>;
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using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>;
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using Scalar = GetPropType<TypeTag, Properties::Scalar>;
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using Indices = GetPropType<TypeTag, Properties::Indices>;
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using Simulator = GetPropType<TypeTag, Properties::Simulator>;
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using SolutionVector = GetPropType<TypeTag, Properties::SolutionVector>;
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using GlobalEqVector = GetPropType<TypeTag, Properties::GlobalEqVector>;
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enum { numEq = getPropValue<TypeTag, Properties::NumEq>() };
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enum { numPhases = getPropValue<TypeTag, Properties::NumPhases>() };
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enum { numComponents = getPropValue<TypeTag, Properties::NumComponents>() };
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enum { fugacity0Idx = Indices::fugacity0Idx };
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enum { saturation0Idx = Indices::saturation0Idx };
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enum { pressure0Idx = Indices::pressure0Idx };
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enum { ncp0EqIdx = Indices::ncp0EqIdx };
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public:
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/*!
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* \copydoc FvBaseNewtonMethod::FvBaseNewtonMethod(Problem& )
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*/
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NcpNewtonMethod(Simulator& simulator) : ParentType(simulator)
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{}
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protected:
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friend ParentType;
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friend NewtonMethod<TypeTag>;
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void preSolve_(const SolutionVector&,
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const GlobalEqVector& currentResidual)
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{
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const auto& constraintsMap = this->model().linearizer().constraintsMap();
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this->lastError_ = this->error_;
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// calculate the error as the maximum weighted tolerance of
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// the solution's residual
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this->error_ = 0;
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for (unsigned dofIdx = 0; dofIdx < currentResidual.size(); ++dofIdx) {
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// do not consider auxiliary DOFs for the error
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if (dofIdx >= this->model().numGridDof() || this->model().dofTotalVolume(dofIdx) <= 0.0)
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continue;
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// also do not consider DOFs which are constraint
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if (this->enableConstraints_()) {
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if (constraintsMap.count(dofIdx) > 0)
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continue;
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}
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const auto& r = currentResidual[dofIdx];
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for (unsigned eqIdx = 0; eqIdx < r.size(); ++eqIdx) {
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if (ncp0EqIdx <= eqIdx && eqIdx < Indices::ncp0EqIdx + numPhases)
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continue;
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this->error_ =
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std::max(std::abs(r[eqIdx]*this->model().eqWeight(dofIdx, eqIdx)),
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this->error_);
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}
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}
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// take the other processes into account
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this->error_ = this->comm_.max(this->error_);
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// make sure that the error never grows beyond the maximum
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// allowed one
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if (this->error_ > Parameters::Get<Parameters::NewtonMaxError<Scalar>>())
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throw Opm::NumericalProblem("Newton: Error "+std::to_string(double(this->error_))+
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+ " is larger than maximum allowed error of "
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+ std::to_string(Parameters::Get<Parameters::NewtonMaxError<Scalar>>()));
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}
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/*!
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* \copydoc FvBaseNewtonMethod::updatePrimaryVariables_
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*/
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void updatePrimaryVariables_(unsigned globalDofIdx,
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PrimaryVariables& nextValue,
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const PrimaryVariables& currentValue,
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const EqVector& update,
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const EqVector&)
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{
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// normal Newton-Raphson update
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nextValue = currentValue;
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nextValue -= update;
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////
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// put crash barriers along the update path
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////
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// saturations: limit the change of any saturation to at most 20%
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Scalar sumSatDelta = 0.0;
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Scalar maxSatDelta = 0.0;
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for (unsigned phaseIdx = 0; phaseIdx < numPhases - 1; ++phaseIdx) {
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maxSatDelta = std::max(std::abs(update[saturation0Idx + phaseIdx]),
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maxSatDelta);
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sumSatDelta += update[saturation0Idx + phaseIdx];
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}
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maxSatDelta = std::max(std::abs(- sumSatDelta), maxSatDelta);
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if (maxSatDelta > 0.2) {
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Scalar alpha = 0.2/maxSatDelta;
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for (unsigned phaseIdx = 0; phaseIdx < numPhases - 1; ++phaseIdx) {
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nextValue[saturation0Idx + phaseIdx] =
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currentValue[saturation0Idx + phaseIdx]
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- alpha*update[saturation0Idx + phaseIdx];
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}
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}
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// limit pressure reference change to 20% of the total value per iteration
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clampValue_(nextValue[pressure0Idx],
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currentValue[pressure0Idx]*0.8,
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currentValue[pressure0Idx]*1.2);
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// fugacities
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for (unsigned compIdx = 0; compIdx < numComponents; ++compIdx) {
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Scalar& val = nextValue[fugacity0Idx + compIdx];
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Scalar oldVal = currentValue[fugacity0Idx + compIdx];
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// get the minimum activity coefficient for the component (i.e., the activity
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// coefficient of the phase for which the component has the highest affinity)
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Scalar minPhi = this->problem().model().minActivityCoeff(globalDofIdx, compIdx);
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// Make sure that the activity coefficient does not get too small.
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minPhi = std::max(0.001*currentValue[pressure0Idx], minPhi);
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// allow the mole fraction of the component to change at most 70% in any
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// phase (assuming composition independent fugacity coefficients).
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Scalar maxDelta = 0.7 * minPhi;
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clampValue_(val, oldVal - maxDelta, oldVal + maxDelta);
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// make sure that fugacities do not become negative
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val = std::max(val, 0.0);
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}
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// do not become grossly unphysical in a single iteration for the first few
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// iterations of a time step
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if (this->numIterations_ < 3) {
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// fugacities
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for (unsigned compIdx = 0; compIdx < numComponents; ++compIdx) {
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Scalar& val = nextValue[fugacity0Idx + compIdx];
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Scalar oldVal = currentValue[fugacity0Idx + compIdx];
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Scalar minPhi = this->problem().model().minActivityCoeff(globalDofIdx, compIdx);
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if (oldVal < 1.0*minPhi && val > 1.0*minPhi)
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val = 1.0*minPhi;
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else if (oldVal > 0.0 && val < 0.0)
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val = 0.0;
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}
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// saturations
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for (unsigned phaseIdx = 0; phaseIdx < numPhases - 1; ++phaseIdx) {
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Scalar& val = nextValue[saturation0Idx + phaseIdx];
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Scalar oldVal = currentValue[saturation0Idx + phaseIdx];
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if (oldVal < 1.0 && val > 1.0)
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val = 1.0;
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else if (oldVal > 0.0 && val < 0.0)
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val = 0.0;
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}
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}
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}
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private:
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void clampValue_(Scalar& val, Scalar minVal, Scalar maxVal) const
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{ val = std::max(minVal, std::min(val, maxVal)); }
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};
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} // namespace Opm
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#endif
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