1. A numerical modeling system of a gas turbine for transient and steady state simulation, producing at least one process parameter, the system comprising: a computer or controller, and a memory device accessible by the computer or controller; and a numerical model stored in the memory device comprising at least one dynamic sub model which simulates a dynamic influence of volumes, actuators, and/or measurement systems, and/or rotor dynamics, and at least one static sub model which simulates the gas turbine disregarding volumes, dynamics of actuators, measurements, and rotor dynamics of the gas turbine.