Computer model, computational model, computer simulation

A computer-generated way to visualise something especially something quite complex[1] – like a complicated process or a system[2]

Terms definitions
1. complex. In senior Technology programmes, the term “complex” is used to identify curriculum level 8 (NCEA Level 3) specialist knowledge and skills. Further explanation can be found in the explanatory notes of the subject specific standards. The progression is from “basic” (curriculum level 6) to “advanced” (curriculum level 7) through to “complex” (curriculum level 8).
2. system. A set of interconnected parts designed to transform, store, transport or control materials, energy and/or information.