SHARED cut-fraction primitive (cut-cell / embedded boundary). More...

#include <pops/core/foundation/types.hpp>

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Classes
struct	pops::detail::CutFraction
	Geometric result of crossing a cut cell: 4 cut distances per face, the 4 apertures alpha_f normalized in [0, 1] (alpha_f = face_distance / h), and the volume fraction kappa of the cell (share of the cell in the active domain). More...

struct	pops::detail::ShortleyWellerWeights
	Shortley-Weller weights (5-point cut-cell stencil) from the 4 cut distances. More...

Namespaces
namespace	pops

namespace	pops::detail

Functions
POPS_HD Real	pops::detail::cut_distance (Real lc, Real ln, Real h)
	Cut distance of ONE face along a direction, starting from the active center (ls < 0).

template<class LevelSet >
POPS_HD CutFraction	pops::detail::cut_fraction (const LevelSet &ls, Real xc, Real yc, Real dx, Real dy)
	Computes the cut geometry of an ACTIVE cell (center (xc, yc) with ls < 0) from a level-set `ls` evaluated at the center and at the 4 cardinal neighbors at distance `dx` / `dy`.

POPS_HD ShortleyWellerWeights	pops::detail::shortley_weller (const CutFraction &cf)

Detailed Description

SHARED cut-fraction primitive (cut-cell / embedded boundary).

A SINGLE face-crossing computation shared between:

the elliptic solver (geometric_mg.hpp: Shortley-Weller weights of the Poisson wall),
the future EB transport (FV aperture of the disc faces). Both MUST read the SAME aperture geometry so the FV aperture is bit-consistent with the elliptic wall (the "Cartesian ring edge" lock: the FV aperture and the elliptic wall must agree on the same disc-of-radius-R boundary; cf. docs/HOFFART_FIDELITY.md for the validation fidelity table).

The canonical level-set is detail::DiscDomain::level_set (numerics/embedded_boundary.hpp): ls(x, y) = hypot(x - cx, y - cy) - R, < 0 INSIDE, sign of the boundary. This primitive is header-only, POPS_HD (device-safe) and STATELESS: it takes a level-set callback by value and the cell, and returns purely geometric distances/aperture.

include/pops/numerics/elliptic/eb/cut_fraction.hpp File Reference¶

Classes

Namespaces

Functions

Detailed Description