Page 185 - ansys

ANSYS CFD

The steps for standard initialization are as follows:

1. Select Standard Initialization as the Initialization Method.

2. Set the initial values.

3. To initialize the flow field using the values set for a particular zone, select the zone name in the
Compute from drop-down list. All values under the Initial Values heading will automatically be
computed and updated based on the conditions defined at the selected zone.

4. To initialize the flow field using computed average values, select all-zones in the Compute from
drop-down list. ANSYS Fluent will compute and update the Initial Values based on the conditions
defined at all boundary zones.

5. If you want to change one or more of the values, you can enter new values manually in the fields
next to the appropriate variables. If you prefer to enter all values manually, you can do so without
selecting a zone in the Compute from list.

6. If your problem involves moving reference frames or sliding meshes, indicate whether the initial
velocities are absolute velocities or velocities relative to the motion of each cell zone by selecting
Absolute or Relative to Cell Zone under Reference Frame. (If no zone motion occurs in the
problem, the two options are equivalent.) The default reference frame for velocity initialization in
ANSYS Fluent is relative. If the solution in most of your domain is rotating, using the relative
option may be better than using the absolute option.

After you are satisfied with the Initial Values displayed in the task page, you can click the

Initialize button to initialize the flow field. If solution data already exist (that is, if you have

already performed some calculations or initialized the solution), you must confirm that it is OK
to overwrite those data.

178