7a3755926b
the motivation for this is the 'TSTEP' eclipse keyword. the reason why this dimension is not simply called 'Time' is that in eclipse, different keywords might use different units, e.g. one keyword could use seconds, another could use years while a third uses days. As an added bonus, the used time units may be different for different scales but identical in others (e.g., for one keyword times might be specified in 'days' for the metric as well as for the labscale, but in 'days' and 'hours' for another second keyword.)
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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Copyright 2013 Statoil ASA.
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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 CONVERSION_FACTORS_HPP
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#define CONVERSION_FACTORS_HPP
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/**
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The unit sets emplyed in ECLIPSE, in particular the FIELD units,
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are quite inconsistent. Ideally one should choose units for a set
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of base quantities like Mass,Time and Length and then derive the
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units for e.g. pressure and flowrate in a consisten manner. However
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that is not the case; for instance in the metric system we have:
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[Length] = meters
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[time] = days
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[mass] = kg
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This should give:
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[Pressure] = [mass] / ([length] * [time]^2) = kg / (m * days * days)
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Instead pressure is given in Bars. When it comes to FIELD units the
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number of such examples is long.
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*/
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namespace Opm {
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namespace Metric {
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const double Pressure = 100000;
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const double Length = 1.0;
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const double Time = 86400;
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const double Mass = 1.0;
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const double Permeability = 9.869233e-16;
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const double DissolvedGasRatio = 1.0;
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const double FlowVolume = 1.0;
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const double Density = 1.0;
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const double Viscosity = 0.001; // cP -> Pa s
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const double Timestep = 24*60*60; // days -> s
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}
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namespace Field {
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const double Pressure = 6894.76;
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const double Length = 0.3048;
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const double Time = 86400;
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const double Mass = 0.45359237;
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const double Permeability = 9.869233e-16;
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const double DissolvedGasRatio = 178.1076; // Mscf / stb -> m^3/m^3
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const double FlowVolume = 0.158987294; // STB -> m^3
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const double Density = 16.01846; // lb/ft^3 -> kg / m^3
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const double Viscosity = 0.001; // cP -> Pa s
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const double Timestep = 24*60*60; // days -> s
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}
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}
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#endif
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