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 said volumes, dynamics of actuators, measurements, and rotor dynamics of the gas turbine simulated by said at least one dynamic sub model, wherein the at least one dynamic sub model includes at least one dynamic input sub model which models the dynamic influence of volumes and/or measurement systems, and generates an input variable for the at least one static sub model from a control variable of the gas turbine.