V&V in Simulation: How to Prove Your Ansys Results are Correct

 Beyond Colorful Pictures: The Rigorous Path to Certified Engineering Results in 2026

In 2026, anyone can produce "colorful pictures" in a solver. However, the true value of a simulation engineer lies in Verification and Validation (V&V). Without a rigorous V&V process, an Ansys simulation is just a guess. In high-stakes industries like Aerospace, Nuclear, and Medical Devices, V&V is the law.

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1. Verification: The Math Check

Verification is the process of determining that a model implementation accurately represents the developer's conceptual description and solution. It’s all about the mathematics.

• Code Verification: Ensuring the software (Ansys) solves the equations without bugs (usually handled by Ansys QA).
• Solution Verification: Estimating the numerical error. This includes checking Iterative Convergence (residuals) and Grid Convergence (using GCI - Grid Convergence Index).

Key Metric: Are your residuals below 1e-5? Is your mass balance error under 0.1%?

2. Validation: The Physics Check

Validation is the process of determining the degree to which a model is an accurate representation of the real world from the perspective of the intended uses of the model.

The Golden Rule: You cannot validate a simulation without experimental data. Whether it is wind tunnel testing, a pressure gauge on a pipe, or a strain gauge on a bracket, you must compare CFD/FEA results to physical reality.

3. Professional V&V Checklist for 2026

Follow this checklist before presenting your results to a client or manager:

Step	Action Required
Mesh Study	Perform a Grid Convergence Index (GCI) analysis.
Sensitivity	Test sensitivity to turbulence models (e.g., k-epsilon vs. SST k-omega).
Comparison	Plot simulation data against experimental test points with error bars.
Reporting	Document all assumptions, boundary conditions, and solver settings.

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Frequently Asked Questions (FAQ)

Q: What is the most common error in Validation?
A: Incorrect Boundary Conditions. Often, the experimental setup has "hidden" factors (like pressure losses in pipes or real-world turbulence intensity) that are not matched in the simulation.

Q: Does Ansys provide V&V documentation?
A: Yes, the Ansys Verification Manual contains hundreds of cases where Ansys results are compared to analytical solutions and experimental data.

Check our Meshing Guide for Grid Convergence details.

Numerical errors often hide in these convergence issues.

Use Python to automate your V&V reporting.

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