constants.H

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#ifndef CONSTANTS_H
#define CONSTANTS_H
 
#include "AMReX_REAL.H"
#include "AMReX_Math.H"
#include "AMReX_GpuQualifiers.H"
 
using namespace amrex::literals;
 
namespace amr_wind::constants {

static constexpr amrex::Real EPS =
    static_cast<amrex::Real>(std::numeric_limits<amrex::Real>::epsilon());

static constexpr amrex::Real TIGHT_TOL =
    std::numeric_limits<amrex::Real>::epsilon() * 1.0e3_rt;

static constexpr amrex::Real LOOSE_TOL =
    std::numeric_limits<amrex::Real>::epsilon() * 1.0e8_rt;

static constexpr amrex::Real LOW_NUM = static_cast<amrex::Real>(
    std::numeric_limits<amrex::Real>::lowest() * 1.0e-10_rt);

static constexpr amrex::Real LARGE_NUM = static_cast<amrex::Real>(
    std::numeric_limits<amrex::Real>::max() * 1.0e-10_rt);

AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE bool
is_close(const amrex::Real a, const amrex::Real b)
{
    return amrex::Math::abs(a - b) < EPS;
}

static constexpr amrex::Real BOLTZMANN_CONSTANT = 1.380649_rt * 1.0e-23_rt;

static constexpr amrex::Real AVOGADRO_CONSTANT = 6.02214076_rt * 1.0e23_rt;

static constexpr amrex::Real UNIVERSAL_GAS_CONSTANT =
    AVOGADRO_CONSTANT * BOLTZMANN_CONSTANT;

static constexpr amrex::Real HEAT_CAPACITY_RATIO = 1.4_rt;

static constexpr amrex::Real MOLAR_MASS_AIR = 0.02896492_rt;

static constexpr amrex::Real MOLAR_MASS_WATER_VAPOR = 0.01801528_rt;
 
} // namespace amr_wind::constants
#endif