Injector Cavitation CFD Benchmark

Schnerr–Sauer overpredicts vapor volume at injector throttle

Falsifiable claim: For a 0.2 mm diesel injector orifice at 150 MPa rail pressure, 300 K fuel, and cavitation number σ=1.2, a Schnerr–Sauer mass-transfer model with n=1e13 nuclei/m³ yields centerline vapor-volume fraction α_v > 0.85 at x/D=4, while the same mesh with Merkle (C_prod=C_dest=80) yields α_v < 0.55. The claim is false if a mesh-independent reproduction (y+<1, ≥8M cells) shows |α_v,SS − α_v,Merkle| < 0.10 at that station, or if either model matches X-ray void-fraction data within 0.10 RMSE.