Module gpu_lbm 

GPU-accelerated Lattice Boltzmann Method (D2Q9) — CPU mock backend.

Implements the D2Q9 velocity set with BGK collision, periodic streaming, macroscopic quantity recovery, and diagnostic utilities for vorticity and divergence fields.

Structs

D2Q9Weights

Lattice weight set and direction set for the D2Q9 velocity model.

GpuLbmDispatch

High-level dispatcher that couples a GpuLbmGrid with per-cell boundary conditions and orchestrates time-stepping.

GpuLbmGrid

2-D D2Q9 LBM grid (CPU mock of a GPU backend).

LbmCell

A single D2Q9 LBM cell holding incoming and outgoing distribution functions.

LbmDiagnostics

Diagnostic utilities for LBM simulations.

Enums

LbmBoundary

Boundary condition type for a cell or face.

Constants

D2Q9_DIRS

D2Q9 discrete velocity directions [cx, cy].

D2Q9_OPPOSITE

Opposite (bounce-back) indices for D2Q9.

D2Q9_Q

Number of discrete velocities in the D2Q9 velocity set.

D2Q9_WEIGHTS

Standard D2Q9 lattice weights.

Functions

bgk_equilibrium

Compute the BGK equilibrium distribution for one velocity direction.

relaxation_from_viscosity

Compute the BGK relaxation parameter ω from kinematic viscosity and cs².