ASME V&V Standards — V&V 10, 20, 40 & FDA Guidance
ASME V&V 10 (solid mechanics), V&V 20 (CFD validation), V&V 40 (medical devices), FDA simulation credibility framework, and GCI requirements.
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Quick Explainer
What does ASME V&V 20 require for a CFD validation study?
ASME V&V 20 requires: (1) Numerical uncertainty estimation via grid and time step convergence with GCI reporting. (2) Physical model uncertainty from key input parameters. (3) Comparison between simulation and experimental data with proper uncertainty analysis. (4) A validation metric demonstrating agreement within experimental uncertainty. It does not prescribe specific mesh sizes — it requires demonstrating numerical errors are smaller than comparison uncertainty.
How does V&V 40 for medical devices differ from other V&V standards?
V&V 40 emphasizes risk-based credibility assessment. The level of V&V rigor must match the intended use and consequence of model failure. A simulation used to optimize a catheter shape (low risk) needs less V&V than one used to determine device fatigue life for regulatory clearance (high risk, replacing physical testing). This risk-based tiering distinguishes V&V 40 from purely technical verification standards.