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Opm::unit Namespace Reference

Definition of various units. More...

## Namespaces

namespace | convert
| Unit conversion routines.

## Functions

Common powers
constexpr double | square (double v)
constexpr double | cubic (double v)

## Variables

constexpr const double | mol = 1
constexpr const double | ppm = 1. / prefix::mega
Length
constexpr const double | meter = 1
constexpr const double | inch = 2.54 * prefix::centi*meter
constexpr const double | feet = 12 * inch
Time
constexpr const double | second = 1
constexpr const double | minute = 60 * second
constexpr const double | hour = 60 * minute
constexpr const double | day = 24 * hour
constexpr const double | year = 365 * day
constexpr const double | ecl_year = 365.25 * day
Volume
constexpr const double | gallon = 231 * cubic(inch)
constexpr const double | stb = 42 * gallon
constexpr const double | liter = 1 * cubic(prefix::deci*meter)
Mass
constexpr const double | kilogram = 1
constexpr const double | gram = 1.0e-3 * kilogram
constexpr const double | pound = 0.45359237 * kilogram
Energy
constexpr const double | joule = 1
constexpr const double | btu = 1054.3503*joule
Standardised constant
constexpr const double | gravity = 9.80665 * meter/square(second)
Force
constexpr const double | Newton = kilogram*meter / square(second)
constexpr const double | dyne = 1e-5*Newton
constexpr const double | lbf = pound * gravity
Pressure
constexpr const double | Pascal = Newton / square(meter)
constexpr const double | barsa = 100000 * Pascal
constexpr const double | atm = 101325 * Pascal
constexpr const double | psia = lbf / square(inch)
Temperature. This one is more complicated
because the unit systems used by Eclipse (i.e. degrees Celsius and degrees Fahrenheit require to add or subtract an offset for the conversion between from/to Kelvin
constexpr const double | degCelsius = 1.0
constexpr const double | degCelsiusOffset = 273.15
constexpr const double | degFahrenheit = 5.0/9.0
constexpr const double | degFahrenheitOffset = 459.67*degFahrenheit
Viscosity
constexpr const double | Pas = Pascal * second
constexpr const double | Poise = prefix::deci*Pas
Permeability
A porous medium with a permeability of 1 darcy permits a flow (flux) of of a fluid with viscosity ( ) under a pressure gradient of acting across an area of .
constexpr const double | darcy = perm_details::darcy

## Detailed Description

Definition of various units.

All the units are defined in terms of international standard units (SI). Example of use: We define a variable `k` which gives a permeability. We want to set `k` to .

using namespace Opm::unit
double k = 0.001*darcy;
Opm::unit
Definition of various units.
Definition Units.hpp:84

We can also use one of the prefixes defined in Opm::prefix

using namespace Opm::unit
using namespace Opm::prefix
double k = 1.0*milli*darcy;
Opm::prefix
Conversion prefix for units.
Definition Units.hpp:59