Quick start basics - Your first simulation session .

Often, "parameter sweeps" are applied to determine the relation between engine performance and a specific parameter, for example fuel flow from idle to max power. Therefore, steady state operating point calculations are required over a wide operating range. GSP's "steady state series calculations" offers a flexible way to apply input parameter sweeps using input tables of e.g. controls.

Again, let's take the fuel flow to perform a parameter sweep.

1.	Click in the Project tree panel on the "TJET_Config" node to load the original configuration. Now add a new case model (name it "Off-design sweep case") and set the case type to St.St. Series (confirm to save changes).

2.	Double-click the manual fuel control icon of the model panel, or alternately right click on the icon and select Edit from the pop-up menu. The component data window for the manual fuel control component is now open.

3.	Click the St. St. OD Series tab sheet. Check if a check mark is placed in the Active option to enable series.

Here the Point-function table for fuel flow is visible. At the top row at Point 0 the design fuel flow should be specified (0.38 kg/s)

4.	Click button A in to add a line and enter 10 as point value.

5.	Enter 0.1 in the fuel flow column Wf[kg/s] in the last row (click on it to edit) and click OK.

Now a fuel flow range has been specified from maximum thrust down to near-idle thrust.

6.	Click button X in to clear the steady state output table (click OK in the optional Confirm window).

It is always recommended to clear the output table before restarting a simulation (the reason for this will become clear later in graphical output).

7.	Run the simulation to perform the parameter sweep calculation (click OK in the set start time window to confirm the starting point 0).

The steady state output table is filled with the subsequent operating point data at each step (output and calculation interval can be set in Transient/Series options).

8.	Optionally click Graph to obtain a graphical presentation of the results, see graphical output.

9.	Repeat the process for similar parameter sweeps with other input parameters.

For example, click Amb.Cond.

, select St. St. OD Series, specify a Mach number parameter sweep and perform similar actions as above.

Hint: you may want to Reinitialize the model prior to a steady-state series simulation in order to bring the model state back to Design point before new input is specified.