Step 2: General Settings

General

1.   Check the mesh.

General Check

   ANSYS FLUENT will perform various checks on the mesh and report the progress in the console. Make sure that the reported minimum volume is a positive number.

2.   Examine the mesh (Figure  9.2).

Figure 9.2: Mesh Display for the Disk Cavity

Extra:   You can use the right mouse button to check which zone number corresponds to each boundary. If you click the right mouse button on one of the boundaries in the graphics window, information will be displayed in the ANSYS FLUENT console about the associated zone, including the name of the zone. This feature is especially useful when you have several zones of the same type and you want to distinguish between them quickly.

3.   Define new units for angular velocity and length.

General Units...

  In the problem description, angular velocity and length are specified in rpm and cm, respectively, which is more convenient in this case. These are not the default units for these quantities.

(a)   Select angular-velocity from the Quantities list, and rpm in the Units list.

(b)   Select length from the Quantities list, and cm in the Units list.

(c)   Close the Set Units dialog box.

4.   Specify the solver formulation to be used for the model calculation and enable the modeling of axisymmetric swirl.

General

(a)   Retain the default selection of Pressure-Based in the Type list.

(b)   Retain the default selection of Absolute in the Velocity Formulation list.

  For a rotating reference frame, the absolute velocity formulation has some numerical advantages.

(c)   Select Axisymmetric Swirl in the 2D Space list.