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specmicp/src/physics/units.hpp
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units.hpp
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/*-------------------------------------------------------
- Module : Physics
- File : units.hpp
- Author : Fabien Georget
Copyright (c) 2014, Fabien Georget <fabieng@princeton.edu>, Princeton University
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Princeton University nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------*/
#ifndef SPECMICP_UNITS_UNITS
#define SPECMICP_UNITS_UNITS
#include "common.hpp"
//! \file units.hpp units conversion
namespace specmicp {
namespace units {
//! units used for length
enum class LengthUnit {
meter,
decimeter,
centimeter
};
//! units used for mass
enum class MassUnit {
kilogram,
gram
};
//! \brief Simple struct which contains the unit information
struct UnitsSet
{
MassUnit mass; //!< The unit to use for mass
LengthUnit length; //!< The unit to use for length (also area and volume)
//! \brief Defaults are the SI unit system
UnitsSet():
mass(MassUnit::kilogram),
length(LengthUnit::meter)
{}
};
//! \brief Base class that handles the units
//!
//! To be inherited by other classes that need units
class UnitBaseClass
{
public:
UnitBaseClass() {}
UnitBaseClass(UnitsSet units):
m_units(units)
{}
//! \brief Return the units
UnitsSet get_units() {return m_units;}
//! \brief Set the units
void set_units(UnitsSet units) {m_units = units;}
//! \brief Return the Mass unit
MassUnit mass_unit() const {return m_units.mass;}
//! \brief Return the Length unit
LengthUnit length_unit() const {return m_units.length;}
//! \brief Return the mass unit
MassUnit& mass_unit() {return m_units.mass;}
//! \brief Return the length unit
LengthUnit& length_unit() {return m_units.length;}
private:
UnitsSet m_units;
};
// Temperature
// -----------
//! Convert a temperature from Celsius to Kelvin
inline scalar_t celsius(scalar_t tc) {return tc + 273.15;}
//! Convert a temperature from Kelvin to Celsius
inline scalar_t to_celsius(scalar_t tk) { return tk - 273.15;}
// Volume
// ------
//! Convert liter to cubic meter
inline scalar_t liter(scalar_t vl) {return 1e-3*vl;}
//! convert cubic meter to liter
inline scalar_t to_liter(scalar_t vcm) {return 1e3*vcm;}
// Pressure
// --------
inline scalar_t convert_pressure(scalar_t pressure_si, LengthUnit length_unit)
{
switch (length_unit) {
case LengthUnit::meter:
return pressure_si;
break;
case LengthUnit::decimeter:
return 1e-2*pressure_si;
break;
case LengthUnit::centimeter:
return 1e-4*pressure_si;
}
}
} // end namespace units
} // end namespace specmicp
#endif // SPECMICP_UNITS_UNITS
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