Example: milestone12_ga

Figure 19.6 — Example: Milestone 12 GA

Source: crates/cfd-optim/examples/milestone12_ga.rs
Crate: cfd-optim

Overview

Genetic algorithm track for in-place Dean–serpentine refinement of Option 2 venturi designs. Inserts curved serpentine segments to exploit Dean instability.

Dean Number

De = Re · √(D_h / 2R_c)
```console

GA score rewards designs that co-localize Dean vortex focusing with venturi cavitation at bend apices.

## GA Mutations

1. **Branch width scaling** — shifts the Zweifach–Fung flow partition ratio
2. **Serpentine insertion** — adds curved segments for Dean secondary flow
3. **Venturi throat narrowing** (`×0.92`) — lowers σ for cavitation

## Run

```bash
cargo run -p cfd-optim --example milestone12_ga

Part Reference

Part VIII — Optimization