Figure 23-21 Second CPMatch

•Click CPTransform

•When the child process has finished, click Finish

Figure 23-22 ELSA Star Controls > Assembly panel

Combustion

The default combustion model coefficients are suitable for this case (see Figure 23-23).

Figure 23-23 ELSA Star Controls > Combustion panel

Initialization

In the Initialization view of the Star Controls panel (see Figure 23-24):

•Set Velocity to Constant Omega

•Set Omega to 2000 rpm

•Set Pressure to 14.602 and select bar from the drop-down menu

•Set Turbulence Energy to 10 m2/s2

•Set Turbulence Dissipation to 2500 m2/s3

•Select the Temperature from trapped mass toggle button and make sure that the Model length unit is set to mm

Figure 23-24 ELSA Star Controls > Initialization panel

Boundary Conditions

Typically, es-ice identifies the cyclic boundaries in a sector model automatically when loading the model into pro-STAR. However, this case has an added static mesh (injector zone) whose cyclic boundaries must be defined manually.

In the Boundary conditions view of the Star Controls panel (see Figure 23-30):

•Use the drop-down menu to set the boundary type of all cylinder regions to

Fixed

•For the Combustion dome, set the Temperature to 450

•For the Piston crown, set the Temperature to 450

•For the Cylinder wall, set the Temperature to 400

•For the Cyclic regions, click Define lead

•In the Plot Tool, select the Fill toggle button

•In the Boundary Tool, click Display all

•Click Keep picked and pick the lead cyclic boundary as shown in Figure 23-25. Note that the angle between cyclic boundaries is defined in a clockwise direction.

Lead Cyclic Boundary

Figure 23-25 Lead cyclic boundary

•In the Boundary Tool, click Define

•For the Cyclic regions, click Define trail

•In the Boundary Tool, click Display all

•Click Keep picked and pick the trailing cyclic boundary as shown in Figure 23-26

Trailing Cyclic Boundary

Figure 23-26 Trailing cyclic boundary

•In the Boundary Tool, click Define

•Select the Extra regions toggle button and use the regions up/down scroll arrows to increase the number to 2 regions

•For Region 1, set the Name to Nozzle

•Set the type to Inlet. No other boundary conditions are defined here as this boundary will be fully defined in pro-STAR.

•Click Define to open the Boundary Tool

•In the Boundary Tool, click Display All and zoom into the area around the nozzle, as shown in Figure 23-27

Figure 23-27 Boundary view of the nozzle area

•Click Split by edge and draw an edge around the circumference of the nozzle. When complete, the nozzle area will become Patch 63 and is shown in Figure 23-28.

Figure 23-28 Nozzle patch

•Press q on the keyboard to exit the pick mode

•Click Keep picked and select the newly created patch

•Press q on the keyboard to exit the pick mode

•Click Define to define the displayed patch as the nozzle

•Use a technique similar to the one described above to define the injector wall (see Figure 23-29) and assign the following properties to it:

•Region Number: 2

•Name: Injector Wall

•Type: Adiabatic Wall

Injector Wall

Figure 23-29 Patches for extra regions

Figure 23-30 ELSA Star Controls > Boundary controls panel for the Cylinder

Next, choose Angelberger as the wall function model and combine all patches for a given boundary type into a single boundary region (see Figure 23-31):