Example: turbulence_models_demo
Figure 5.2 — Example: Turbulence Models Demo
Crate: cfd-suite (workspace root)
Run: cargo run --example turbulence_models_demo
Source: examples/turbulence_models_demo.rs
What This Example Demonstrates
Side-by-side demonstration of three RANS turbulence models on a 20×20 shear-flow grid, showing how eddy viscosity and closure behaviour differ.
| Model | API | Regime |
|---|---|---|
| Standard k-ε (two-equation) | KEpsilonModel | Industrial internal flows |
| k-ω SST (Menter) | KOmegaSSTModel | Adverse-pressure-gradient flows |
| Spalart-Allmaras (one-equation) | SpalartAllmaras | Aerospace boundary layers |
Key Code Snippet
use cfd_2d::physics::turbulence::{
KEpsilonModel, KOmegaSSTModel, SpalartAllmaras, TurbulenceModel,
};
use cfd_2d::grid::StructuredGrid2D;
let grid = StructuredGrid2D::<f64>::new(20, 20, 0.0, 2.0, 0.0, 2.0)?;
// Each model is exercised over the same grid and initial conditions
// so eddy-viscosity magnitudes can be compared directly.Physics Background
All three models solve transport equations for turbulent scalars that feed into
an eddy-viscosity νt used in the momentum equation as τ_ij = νt S_ij.
- k-ε: robust for free shear; over-predicts separation
- k-ω SST: blends near-wall and free-stream; best for separated flows
- SA: minimal CPU cost; designed for attached aerodynamic flows