Physical phenomena occur in a wide range of mathematical applications: from fluid to solid mechanics, electromagnetic and electrical engineering. Engineers working toward an optimized modelling must develop their software and physical system together. This development follows a standard life-cycle with design, coding and test. Validation is become quite complex and is subdivided into several parts: unit, integration, functional and system. Each piece of validation brings its brick. Entire system is tested as per the requirements. They are about numerical results, performance, architecture and fault tolerance. We defined a distributed architecture for numerical computation based on the use of mobile agents. A group or space of agents manages a whole computation, from its registration until its validation. Their role is multiple: they prepare input data and operate tasks but above they administer distributed architecture. The main impact is failure management. Failure can concern not only software services but also material. Also, the completion of an execution can need task recovery, anomaly reporting or favourite configuration. All these details consist of a main report about validation of distributed application though simulation.