Example: turbulence_validation_demo
Figure 5.3 — Example: Turbulence Validation Demo
Crate: cfd-suite (workspace root)
Run: cargo run --example turbulence_validation_demo
Source: examples/turbulence_validation_demo.rs
What This Example Demonstrates
Runs the comprehensive turbulence validation suite for k-ε, k-ω SST, and
Spalart-Allmaras via run_turbulence_validation::<f64>().
| Validation | Method | Target |
|---|---|---|
| Homogeneous turbulence decay | Analytical k-ε decay | < 1 % error |
| Wall boundary conditions | Near-wall k, ω, νt | Match literature |
| Numerical stability | NaN/inf check over iteration | None |
| Convergence | Monotonic physical evolution | Pass |
Key Code Snippet
use cfd_2d::physics::turbulence::run_turbulence_validation;
// Runs all four validation passes in sequence
run_turbulence_validation::<f64>();Physics Background
Homogeneous turbulence decay follows k(t) = k₀ (1 + t/t₀)^(−n) where n
depends on the turbulence model constants. The k-ε model with standard
constants should reproduce n ≈ 1.2 – 1.4 over the initial decay period.
Near-wall boundary conditions: at the wall, k = 0 (no-slip),
ω_wall = 6ν / (β₁ Δy²) (k-ω SST), and νt_wall = 0.