553cdf948c
Delegate uniform-grid PML faces to stretch_with_scpml, using physical-thickness scaling and electric-center/magnetic-edge samples. Cover disabled axes, touching faces, real profiles, and final stretch caps. Validation: 200 focused tests passed; Ruff passed.
1.4 KiB
fdfd
::: meanas.fdfd
Core operator layers
::: meanas.fdfd.functional
::: meanas.fdfd.operators
::: meanas.fdfd.solvers
::: meanas.fdfd.scpml
::: meanas.fdfd.farfield
SCPML conventions
stretch_with_scpml now uses -1 for the low-index face and +1 for the
high-index face, matching CPML and propagation conventions. It returns copied
widths by default; pass copy=False to request mutation explicitly.
Both SCPML builders accept kappa_function(depth) for real stretching and
max_imag_ratio to limit the final dimensionless abs(Im(s))/Re(s). Start a
mode-solver convergence study with max_imag_ratio=1.0: overly strong imaginary
stretching can produce above-light-line PML artifacts. The cap is not a general
spectral guarantee, and weaker absorption can increase boundary reflections.
Check domain size, PML thickness, strength, mode localization, and residuals.
The general scattering profile remains uncapped by default.
uniform_grid_scpml builds unit widths by applying stretch_with_scpml to
both faces of each enabled axis. Both builders divide imaginary grading by
physical layer thickness and sample electric widths at cell centers and
magnetic widths at cell edges. This corrects the uniform builder's previous
thickness-independent strength and reversed E/H sample offsets; retune existing
uniform-builder profiles using domain/PML convergence checks.