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104 lines
4.6 KiB
C++
104 lines
4.6 KiB
C++
/*
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Copyright 2015 SINTEF ICT, Applied Mathematics.
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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 3 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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*/
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#ifndef OPM_FLOWDIAGNOSTICS_HEADER_INCLUDED
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#define OPM_FLOWDIAGNOSTICS_HEADER_INCLUDED
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#include <vector>
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#include <utility>
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#include <tuple>
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struct Wells;
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namespace Opm
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{
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/// \brief Compute flow-capacity/storage-capacity based on time-of-flight.
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///
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/// The F-Phi curve is an analogue to the fractional flow curve in a 1D
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/// displacement. It can be used to compute other interesting diagnostic
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/// quantities such as the Lorenz coefficient. For a technical description
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/// see Shavali et al. (SPE 146446), Shook and Mitchell (SPE 124625).
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///
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/// \param[in] pv pore volumes of each cell
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/// \param[in] ftof forward (time from injector) time-of-flight values for each cell
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/// \param[in] rtof reverse (time to producer) time-of-flight values for each cell
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/// \return a pair of vectors, the first containing F (flow capacity) the second
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/// containing Phi (storage capacity).
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std::pair<std::vector<double>, std::vector<double>>
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computeFandPhi(const std::vector<double>& pv,
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const std::vector<double>& ftof,
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const std::vector<double>& rtof);
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/// \brief Compute the Lorenz coefficient based on the F-Phi curve.
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///
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/// The Lorenz coefficient is a measure of heterogeneity. It is equal
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/// to twice the area between the F-Phi curve and the F = Phi line.
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/// The coefficient can vary from zero to one. If the coefficient is
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/// zero (so the F-Phi curve is a straight line) we have perfect
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/// piston-like displacement while a coefficient of one indicates
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/// infinitely heterogenous displacement (essentially no sweep).
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///
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/// Note: The coefficient is analogous to the Gini coefficient of
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/// economic theory, where the name Lorenz curve is applied to
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/// what we call the F-Phi curve.
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///
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/// \param[in] flowcap flow capacity (F) as from computeFandPhi()
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/// \param[in] storagecap storage capacity (Phi) as from computeFandPhi()
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/// \return the Lorenz coefficient
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double computeLorenz(const std::vector<double>& flowcap,
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const std::vector<double>& storagecap);
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/// \brief Compute sweep efficiency versus dimensionless time (PVI).
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///
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/// The sweep efficiency is analogue to 1D displacement using the
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/// F-Phi curve as flux function.
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///
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/// \param[in] flowcap flow capacity (F) as from computeFandPhi()
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/// \param[in] storagecap storage capacity (Phi) as from computeFandPhi()
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/// \return a pair of vectors, the first containing Ev (sweep efficiency)
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/// the second containing tD (dimensionless time).
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std::pair<std::vector<double>, std::vector<double>>
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computeSweep(const std::vector<double>& flowcap,
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const std::vector<double>& storagecap);
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/// \brief Compute volumes associated with injector-producer pairs.
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///
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/// \param[in] wells wells structure, containing NI injector wells and NP producer wells.
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/// \param[in] porevol pore volume of each grid cell
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/// \param[in] ftracer array of forward (injector) tracer values, NI per cell
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/// \param[in] btracer array of backward (producer) tracer values, NP per cell
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/// \return a vector of tuples, one tuple for each injector-producer pair,
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/// where the first and second elements are well indices for the
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/// injector and producer, and the third element is the pore volume
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/// associated with that pair.
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std::vector<std::tuple<int, int, double>>
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computeWellPairs(const Wells& wells,
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const std::vector<double>& porevol,
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const std::vector<double>& ftracer,
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const std::vector<double>& btracer);
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} // namespace Opm
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#endif // OPM_FLOWDIAGNOSTICS_HEADER_INCLUDED
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