GSP automatically determines the order of calculation the components in the gas path. The order is indicated by the Calc.Nr. (component number) field and also on top of the component icons in the Model panel, after the model has been initialized. Some elements of the calculation order can be user controlled. This is important for unlinked / non-gas path components such as Additional output parameter, Constant expression and Equation schedulers that depend on other component calculation results. The non-linked components for control are all automatically moved to the start since these are to control model inputs and parameters in expression input fields. The post-processing type components (Additional output parameter etc.) are put at the end since these are using calculated data from the other components.

Ordering unlinked components

Right-clicking the component icon in the model panel, enables the user to move the components forward or backward in the component array. This may be necessary if one component uses data calculation in another similar components. A good example is a series of Additional output parameter components where the next uses the value of the prior additional output parameter.

Inlet calculation order

The inlet calculation order may be important if multiple engines are simulated simultaneously or with multiple inlet engine systems. Inlet calculation order can be controlled by two different mechanisms.

•Use the "Inlet Nr" field in the design tab (the turbojet with the lowest Inlet Nr is calculated first) which takes precedence over the inlet exit station number. If two turbojets have identical "Inlet Nr", then the one with the lowest inlet exit station number is calculated first.

•I no precedence is determined by Inlet nr, you can instead set the inlet exit station number of the turbojet to be calculated first to a value lower than the other turbojet (i.e. if the inlet exit station number of the turbojet to be calculated first is "2", then the inlet exit station number of the other turbojet should be set to a value greater than this (e.g. 2.1, etc.)).