Constants.hpp

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#ifndef OPENSWMM_CONSTANTS_HPP
#define OPENSWMM_CONSTANTS_HPP
 
namespace openswmm {
 
// ============================================================================
// Physical constants
// ============================================================================
 
namespace constants {
 
constexpr double GRAVITY       = 32.2;
 
constexpr double SQRT_GRAVITY     = 5.67450438786;  // sqrt(32.2)
 
constexpr double INV_SQRT_GRAVITY = 0.17622692584;  // 1.0 / sqrt(32.2)
 
constexpr double PI            = 3.141592654;
 
constexpr double PHI           = 1.486;
 
constexpr double MEXP          = 5.0 / 3.0;
 
constexpr double VISCOS        = 1.1e-5;
 
constexpr double SEC_PER_DAY   = 86400.0;
 
constexpr double FT_PER_IN     = 1.0 / 12.0;
 
constexpr double IN_PER_FT     = 12.0;
 
// ============================================================================
// Numerical thresholds and tolerances
// ============================================================================
 
constexpr double FUDGE         = 0.0001;
 
constexpr double MIN_SURFAREA  = 12.566;  // 4*pi
 
constexpr double MIN_DELTA_Z   = 0.001;
 
constexpr double XTOL          = 0.001;
 
constexpr double TINY          = 1.0e-6;
 
static constexpr double MISSING = -1.0e10;
 
// ============================================================================
// Dynamic wave solver constants
// ============================================================================
 
constexpr double OMEGA         = 0.5;
 
constexpr double DEFAULT_HEAD_TOL  = 0.005;
 
constexpr int    DEFAULT_MAX_TRIALS = 8;
 
constexpr double MAX_VELOCITY  = 50.0;
 
constexpr double MIN_TIMESTEP  = 0.001;
 
constexpr double EXTRAN_CROWN_CUTOFF = 0.96;
 
constexpr double SLOT_CROWN_CUTOFF   = 0.985257;
 
constexpr double SLOT_WIDTH_FACTOR   = 0.001;
 
// ============================================================================
// ODE solver constants (RK45 Cash-Karp)
// ============================================================================
 
namespace ode {
 
constexpr int    MAX_STEPS     = 10000;
 
constexpr double ODE_TINY      = 1.0e-30;
 
constexpr double SAFETY        = 0.9;
 
constexpr double PGROW         = -0.2;
 
constexpr double PSHRNK        = -0.25;
 
constexpr double ERRCON        = 1.89e-4;
 
constexpr double GWTOL         = 0.0001;
 
constexpr double ODETOL        = 0.0001;
 
} // namespace ode
 
// ============================================================================
// Hydraulic structure constants
// ============================================================================
 
constexpr double MIN_LINK_FLOW = 0.001;
 
// ============================================================================
// Cross-section constants
// ============================================================================
 
constexpr double RECT_ALFMAX   = 0.97;
 
constexpr double TRAP_ALFMAX   = 0.98;
 
constexpr int    N_TRANSECT_TBL = 51;
 
constexpr int    MAX_SHAPES    = 26;
 
// ============================================================================
// Data structure constants
// ============================================================================
 
constexpr int    N_FLOW_CLASSES = 7;
 
constexpr int    MAX_PAST_RAIN = 48;
 
constexpr int    N_TIME_BINS   = 5;
 
constexpr int    DATE_DELTA    = 693594;
 
} // namespace constants
} // namespace openswmm
 
#endif // OPENSWMM_CONSTANTS_HPP