Web-based scientific simulation tools for E-ELT instruments

In the frame of the EAGLE phase A study, we have developed a scientific simulator which has been used to constrain the instrument high level specifications. This simulator was coupled to a web interface to allow an easier access by the EAGLE science team, and run specific simulations covering the EAGLE scientific objectives. We give a functional description of this simulator, and illustrate how it was used in practice to derive a specification on the Ensquared Energy of EAGLE. Given the success of the EAGLE simulator, we developed other telescope/instrument simulators, including a general image/datacube simulator which is now freely accessible on the web.