•Select Global settings from the drop-down menu at the top of the panel

•Check that the Wall function model is set to Angelberger

•Click Check regions to ensure that all regions are valid

•Make sure the consistently toggle button is selected and then click Join regions

Figure 23-31 ELSA Star Controls > Boundary Conditions panel for the Global settings

Time step control

Following the ELSA spray model recommendations, use the following settings for the time step size:

•A range between 1×10–6 and 1×10–5 seconds during the compression and expansion phases

•A minimum of 1×10–8 seconds when the rate of injection changes rapidly (i.e. during the start or end of injection)

•A maximum of 1×10–7 seconds when the rate of injection is relatively constant

In the Time step control view of the Star Controls panel (see Figure 23-32):

•Use the time step up/down scroll arrows to increase the number to 6 time steps

•Set the step size applicability range (in terms of crank angle) and magnitude as follows:

•Time step 1: Set Angle to 680 and Step to 0.15

•Time step 2: Set Angle to 699.75 and Step to 0.003

•Time step 3: Set Angle to 700 and Step to 0.000198

•Time step 4: Set Angle to 700.5 and Step to 0.00198

•Time step 5: Set Angle to 721.2 and Step to 0.0198

•Time step 6: Set Angle to 731.2 and Step to 0.075

Figure 23-32 ELSA Star Controls > Time step control panel

Write data

In the Write data view of the Star Controls panel (see Figure 23-33):

•Deselect the Bcdefi toggle button as the nozzle inlet boundary conditions will be defined in pro-STAR

•Click Write data

Figure 23-33 ELSA Star Controls > Write data panel