Validating astrophysical simulation codes

The validating astrophysical simulations against experiments that probe fluid instabilities, nuclear burning and radiation transport are discussed. Varification and validation (V&V) is maturing as discipline due to its importance in fields such as computational fluid dynamics (CVD). Validation requires identifying the physical processes pertinent to events in questions and, for each one, finding or devising laboratory experiments with which to compare them to simulation code results. The physical relevant to astrophysical events, validation methodology and the results of validation test performed with codes modeling some of astrophysical processes is also discussed.