Struct VgfPoisson 

pub struct VgfPoisson { /* private fields */ }

Vico–Greengard–Ferrando isolated Poisson solver.

Convolves the density with a truncated Green’s function whose Fourier transform G_hat(k) = -(1 - cos(kR)) / (2π k²) is smooth, giving spectral accuracy without the real-space singularity regularization required by Hockney-Eastwood.

The kernel is computed analytically in Fourier space — no FFT of a real-space Green’s function is needed.

Implementations

impl VgfPoisson

pub fn new(domain: &Domain) -> Self

Create a new VGF solver from the simulation domain.

Precomputes FFT plans and the truncated Green’s function kernel analytically in Fourier space on a (2N)^3 padded grid.

Trait Implementations

impl PoissonSolver for VgfPoisson

fn set_progress(&mut self, p: Arc<StepProgress>)

Attach a shared progress handle for intra-step reporting.

fn solve(&self, density: &DensityField, g: f64) -> PotentialField

Solve the Poisson equation for the given density field.

Zero-pads rho into (2N)^3, convolves with the VGF kernel in Fourier space, and extracts the N^3 potential sub-grid.

fn compute_acceleration(&self, potential: &PotentialField) -> AccelerationField

Compute the gravitational acceleration via second-order finite differences.