WindSim - CFD Laboratory

Phase D / Post-Processing & Visualization

This lab executes a deterministic LBM D3Q19 CPU Reference Kernel. Voxelization is handled on CPU for ground-truth consistency. Runs are persistent across reloads.

Phase D active Performance Grade: Standard

Geometry Domain Boundary Solver Run Inspect

Select and confirm a geometry to unlock the domain stage.

> Geometry Sphere

Sphere

r = 0.6, ~2500 faces

Cube

1.0 × 1.0 × 1.0

Cylinder

r = 0.4, h = 1.2

NACA 0012

chord = 2.0, span = 1.0

Ahmed Body

simplified bluff body

+ Import Custom Mesh

Phase D ready - STL, GLB, or Three.js Geometry

> Domain 6.0 x 6.0 x 6.0

Span X 6.0 m

Span Y 6.0 m

Span Z 6.0 m

Domain sizing is live in Phase D and drives the viewport shell immediately.

> Boundary Conditions

Inlet Velocity 0.080 lu/ts

Velocity in lattice units per timestep. Keep below 0.15 for stability.

Inlet Direction

> Solver Settings

Grid Resolution

Solver Mode

LES adds deterministic eddy viscosity inside the existing LBM step. It does not change bounce-back or MEM force logic.

Relaxation Time (τ) 0.600

Controls viscosity. Lower = less viscous, faster flow. τ > 0.5 required for stability.

Steps per Frame 4

More steps = faster convergence but heavier GPU load.

> Visualization

Field Variable

Color Map

Slice Axis

Position 0.00 m

Map Range Auto

Show Geometry

Domain: 6.0 × 6.0 × 6.0 m
Object: Sphere (r=0.6)
Grid: 64 × 64 × 64
Workflow: Geometry pending

Aerodynamic Performance

Drag (lu)

—

Lift (lu)

—

Side (lu)

—

Drag (N)

—

Lift (N)

—

Side (N)

—

Ref Area: — m² (—)
Dyn Pres: — Pa
Force Scale ($C_F$): — N/lu
Anchors: 10 m/s, 1.225 kg/m³
Re (Target): —
Re (Actual): —
Status: —
Reason: —

Convergence

Mass Error

—

Status

Locked

Validation Log

Simulation Regime & Advice

Regime

LAMINAR

Calibration

—

Re Class

—

Coefficient Capability

SETTLING

—

Summary: —
Rec. Grid: —
Rec. Modes: —
Blocks: none

Simulation Capability

Recommended Grid

—

Max Safe Grid

—

Solver Advice

—

Coefficient Support

—

Warnings

none

Solver Info

Phase: Phase D — Post-Processing
System Grade: Standard Performance
Target Method: LBM D3Q19
Solver: CPU LBM Reference (JS)
Mode: LAMINAR
Effective ν: --
Effective τ: --
LES Clamps: 0 step / 0 total
Smagorinsky Cs: --
Graphics: WebGPU (Visualization Only)
Geometry Path: CPU Voxelization
Exportability: JSON Logs / Field Buffers

About

This page is currently the Phase D CFD Lab. It implements a deterministic LBM solver core with full observability, divergence checks, and state persistence.