Verification and Validation Defined

In everyday life, if they are used at all, the words verification and validation tend to be used interchangeably. In technical circles, however, they have specific definitions, which are related, but not the same.

Validation has to do with whether or not the correct equations have been chosen for the task at hand. For example, you shouldn't be trying to solve the Euler equations if you want a good measure of skin friction. In that case, you must solve a set of equations with viscous terms, such as the Navier-Stokes equations, or possibly the boundary layer equations.

Verification, on the other hand, has to do with whether or not the chosen equations are being solved correctly. Verification procedures address such things as whether or not you have sufficient grid resolution, whether or not a solution is converged, and whether or not the algorithm has been coded correctly.

So, now that you have the definitions, let's learn more about verification and validation at the main V & V page .

Or, return to the Innovative CFD home page and browse one of the other topics.

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