ASME VVUQ 20.1-2024 PDF

Full title and description

ASME VVUQ 20.1-2024 — Multivariate Metric for Validation. This document is a supplement to ASME V&V 20-2009 and presents a multivariate validation metric that builds on the pointwise approach of V&V 20 to provide a global assessment of discrepancies between experimental and simulated validation variables (across space, time, and multiple variables), and that accommodates experimental, numerical, and input-parameter uncertainties.

Abstract

ASME VVUQ 20.1 defines a multivariate validation metric for computational modeling and simulation. The metric supports comparing multiple validation variables (same variable at different locations/times or different variables at the same location/time, or combinations thereof), and it handles independent or shared uncertainties among validation set points. It is intended to extend the pointwise validation approach of ASME V&V 20 into a global, multivariate framework for more comprehensive model validation.

General information

• Status: Current / Active.
• Publication date: 30 November 2024.
• Publisher: American Society of Mechanical Engineers (ASME).
• ICS / categories: Mechanical and thermal-fluid engineering; computational modeling and simulation; verification, validation, and uncertainty quantification (VVUQ).
• Edition / version: 2024 edition (VVUQ 20.1-2024; supplement to ASME V&V 20-2009).
• Number of pages: 73 pages (PDF/print).

Scope

This standard provides a formal multivariate metric and guidance for validating computational models against experimental data when multiple correlated validation variables are involved. It applies to validation activities where assessments must account for spatial and/or temporal sets of data points and where experimental, numerical, and input-parameter uncertainties may be independent or shared across validation points. The metric is intended for use as a supplement to the pointwise techniques in ASME V&V 20 and to improve global assessments of model–experiment discrepancies.

Key topics and requirements

• Definition and formulation of a multivariate validation metric that aggregates discrepancies across variables, locations, and time instants.
• Treatment of experimental, numerical, and input-parameter uncertainty in the multivariate comparison.
• Guidance on selecting validation set points (spatial/time sampling and variable selection) for the multivariate assessment.
• Instructions for combining independent and shared uncertainties across multiple validation points.
• Relationship and consistency requirements with ASME V&V 20 pointwise validation methods (supplemental material and examples illustrating use).

Typical use and users

Engineers and researchers who develop, verify, and validate computational models in fluid dynamics, heat transfer, and related thermal‑fluid systems; validation experiment designers; simulation analysts responsible for model qualification; regulatory reviewers and quality-assurance teams that require rigorous, quantitative validation evidence across multiple correlated outputs.

Related standards

ASME V&V 20-2009 (Standard for Verification and Validation in Computational Fluid Dynamics and Heat Transfer) — VVUQ 20.1 is explicitly a supplement to this standard. Other related ASME VVUQ standards include VVUQ 1-2022 (VVUQ terminology), VVUQ 10/V&V 10 series (computational solid mechanics), VVUQ 10.2-2021 (UQ in solid mechanics), VVUQ 30.1-2024, and V&V 40-2018 (credibility for medical devices).

Keywords

multivariate validation metric; verification; validation; uncertainty quantification (UQ); VVUQ; ASME V&V 20; computational fluid dynamics (CFD); heat transfer; model validation; experimental uncertainty; numerical uncertainty.

FAQ

Q: What is this standard?

A: ASME VVUQ 20.1-2024 is an ASME standard titled "Multivariate Metric for Validation" that defines a multivariate validation metric and guidance to extend ASME V&V 20’s pointwise validation into a global, multivariate assessment.

Q: What does it cover?

A: It covers formulation and application of a multivariate metric for comparing experimental and simulation results across multiple variables, spatial locations, and time instants, including how to account for experimental, numerical, and input-parameter uncertainties (independent or shared).

Q: Who typically uses it?

A: Model developers, verification & validation engineers, experimentalists designing validation tests, simulation analysts in CFD/thermal-fluid fields, and organizations performing model qualification and regulatory submission reviews.

Q: Is it current or superseded?

A: The 2024 edition (VVUQ 20.1-2024) is the current, active supplement; it revises/amends the validation approach in conjunction with ASME V&V 20-2009. Publication date is 30 November 2024.

Q: Is it part of a series?

A: Yes — it is part of the ASME VVUQ family of standards that address verification, validation, and uncertainty quantification across domains (VVUQ 1, VVUQ 10, VVUQ 20, VVUQ 30, VVUQ 40, etc.), and specifically supplements V&V 20 for multivariate validation needs.

Q: What are the key keywords?

A: Multivariate metric; validation; verification; uncertainty quantification; VVUQ; ASME V&V 20; CFD; heat transfer; model credibility.