CFD TOPIC HUB · VERIFICATION & VALIDATION
CFD verification and validation: prove the result is credible.
Use this hub when you need evidence that a CFD result is numerically resolved, physically defensible and suitable for an engineering decision, report, thesis or journal paper.
Start from the decision the CFD model has to support.
Verification asks whether the equations are being solved with adequate numerical resolution. Validation asks whether the model represents the physical system well enough for the intended use.
Use these checks before adding model complexity.
- Separate iterative convergence, mesh sensitivity, timestep sensitivity and physical validation.
- Use quantities of interest rather than residuals alone to judge numerical stability.
- Report uncertainty and sensitivity where the engineering conclusion depends on them.
Already have a CFD model that behaves incorrectly?
Start from the symptom and follow the Technical Case diagnostic sequence before tuning unrelated solver controls.
Browse Technical Cases →Build the modelling decision from the underlying physics.
Use the guides for definitions, assumptions, workflow design and evidence requirements.
Mesh-Independence Study for a Journal Paper
Three-grid studies, refinement and GCI
Open resource →ENGINEERING GUIDECFD Verification vs Validation
Separate numerical and physical evidence
Open resource →ENGINEERING GUIDECFD Sensitivity & Uncertainty Analysis
Identify influential assumptions and inputs
Open resource →ENGINEERING GUIDECFD Time-Step Independence Study
Demonstrate temporal resolution
Open resource →ENGINEERING GUIDECompare CFD with Experimental Data
Structure a fair CFD-to-test comparison
Open resource →ENGINEERING GUIDEValidate CFD Without Experimental Data
Use hierarchy, conservation and independent evidence
Open resource →Diagnose the failure mode when the solved model disagrees.
Technical Cases are organized around symptoms, likely causes, diagnostic order and controlled fixes.
Grid-Independence Study Does Not Converge
Diagnose non-monotonic or non-asymptotic mesh trends
Open resource →TECHNICAL CASECFD Converged but Results Look Wrong
Challenge false confidence in low residuals
Open resource →TECHNICAL CASECFD Time-Step Sensitivity
Connect temporal resolution to engineering signals
Open resource →TECHNICAL CASECFD Results Do Not Match Experiment
Separate test, input, numerical and model-form error
Open resource →Challenge the CFD with transparent engineering checks.
Independent calculations help reveal whether the problem is in the physics, inputs, numerical resolution or interpretation.
Grid Convergence Index Calculator
Quantify three-grid convergence evidence
Open resource →ENGINEERING TOOLCFD Verification Workflow
Connect mesh, timestep, conservation and validation checks
Open resource →ENGINEERING TOOLCourant Number Calculator
Screen transient resolution before a sensitivity study
Open resource →Continue with the same engineering context.
Move into structured training when you need the complete methodology, or engineering support when the answer depends on the actual project.
CFD Verification & Troubleshooting
Learn convergence, conservation, mesh sensitivity, timestep sensitivity and validation as one credibility workflow.
Open resource →ENGINEERING SUPPORTCFD Troubleshooting & Model Review
Use independent review when a project decision depends on numerical credibility.
Open resource →Connect adjacent modelling decisions.
Complex CFD problems often cross more than one topic cluster. Continue into the governing issue rather than searching by software menu alone.