I purchased two documents that explain how to validate a simulation model in the area of Structural Mechanics.

ASME V&V 10.1-2012 “An Illustration of the Concepts of V&V in Computational Solid Mechanics” and

ASME V&V 10-2006 "Guide for Verification and Validation in Computational Solid Mechanics".

These documents have been endorsed by the FDA for studies that might be submitted as part of a 510(k) PMA.

The 10.1 Illustration is much more useful and readable than the Guide. The pdf files have Digital Rights Management embedded so you can only open them on the computer that you installed the DRM software into your PDF viewer to read them, but you can also print the documents.