openswmm::hydkernels Namespace Reference

Classes
struct	CulvertCurve
	Inlet-control curve coefficients for one culvert type code. More...

Functions
OPENSWMM_KERNEL_FN double	fricSlopeHW (double velocity, double hyd_rad, double c_hw) noexcept
OPENSWMM_KERNEL_FN double	fricSlopeDW (double velocity, double hyd_rad, double roughness) noexcept
OPENSWMM_KERNEL_FN double	culvertInflow (double q_proposed, double head, double y_full, double a_full, double slope, const CulvertCurve &cc, bool mitered, double &dqdh) noexcept
	Inlet-controlled discharge for one culvert.

Variables
constexpr double	kViscosity = 1.1e-5
constexpr double	kGravity = 32.2
	Gravity in internal units, matching constants::GRAVITY.

Function Documentation

culvertInflow()

OPENSWMM_KERNEL_FN double openswmm::hydkernels::culvertInflow ( double q_proposed, double head, double y_full, double a_full, double slope, const CulvertCurve & cc, bool mitered, double & dqdh )

noexcept

Inlet-controlled discharge for one culvert.

Three regimes, keyed on the relative headwater h/D: unsubmerged (≤ 0.95) Q = A·√D · (h/D / K)^(1/M) submerged (≥ y₂) Q = A·√D · √((h/D − Y + scf) / C) between linear interpolation of the two

with the slope correction factor scf = −7·S for a mitered inlet and +0.5·S otherwise. Returns q_proposed unchanged when the inlet does not control.

Parameters

cc	the type code's coefficients (see culvert::getCoeffs)
mitered	whether the type code is a mitered inlet (5, 37, 46)

Here is the caller graph for this function:

fricSlopeDW()

OPENSWMM_KERNEL_FN double openswmm::hydkernels::fricSlopeDW ( double velocity, double hyd_rad, double roughness )

noexcept

Darcy-Weisbach friction slope, with the Swamee-Jain explicit approximation to Colebrook-White above the laminar range. S_f = f·v²/(2·g·D), D = 4R

Here is the caller graph for this function:

fricSlopeHW()

OPENSWMM_KERNEL_FN double openswmm::hydkernels::fricSlopeHW ( double velocity, double hyd_rad, double c_hw )

noexcept

Hazen-Williams friction slope. S_f = (v / (1.318·C·R^0.63))^(1/0.54)

Here is the caller graph for this function:

Variable Documentation

kGravity

double openswmm::hydkernels::kGravity = 32.2

inlineconstexpr

Gravity in internal units, matching constants::GRAVITY.

kViscosity

double openswmm::hydkernels::kViscosity = 1.1e-5

inlineconstexpr

Kinematic viscosity of water, ft²/s. Spelled here rather than included so the header stays dependency-free for the plugin build; it must equal constants::VISCOS, and a static_assert in ForceMain.cpp holds it to that.