Figure 23-46 Nozzle scalar definition

Setting up analysis controls

The ELSA model is a complex simulation that requires tighter residuals and lower under-relaxation settings, to be defined in this section. You must also specify the run’s post-processing requirements.

Define the solution method, differencing scheme and scalar residual tolerance:

•In the pro-STAR Model Guide, select Analysis Controls > Solution Method

(see Figure 23-47) and set the panel parameters as follows:

•Maximum Residual Tolerance — 1e-05

•Maximum Number of Corrector Stages — 500

•Under-Relaxation for Pressure Correction — 0.3

•Click Apply

Figure 23-47 Solution Method panel

•In the pro-STAR Model Guide, select Analysis Controls > Primary Variables (see Figure 23-48)

•In the Differencing Scheme tab, set the Differencing Scheme to UD for U-Momentum, V-Momentum and W-Momentum

•Set Differencing Scheme to UD for Turbulence KE and Turbulence Diss.

•Click Apply

Figure 23-48 Differencing Schemes panel

•In the pro-STAR Model Guide, select Analysis Controls > Additional Scalars (Controls) (see Figure 23-49)

•In the Scalar table, select Scalar Number 48 and set the Residual Tolerance to 1e-12

•Click Apply

•Select Scalar Number 49 and set the Residual Tolerance to 1e-12

•Click Apply

Figure 23-49 Scalar residual tolerances

Specify the analysis controls for post-processing:

•In the pro-STAR Model Guide, select Analysis Controls > Analysis Output

•Select the Post tab (see Figure 23-50) and set the panel parameters as follows:

•Output Frequency — 100

•Backup Frequency — 600

•Click Apply

Figure 23-50 Analysis Output > Post panel

•Select the Transient tab (see Figure 23-51) and set the panel parameters as follows:

•Starting at time (degCA) — 680

•Output interval (degCA) — 2

•In the displayed list of available output data, select LIQM_ELSA and click the Post check box

•Repeat the previous step for the following variables:

•LIQV_ELSA

•Temperature

•Click Apply