30.9.2. User Inputs for the Residence Time

The procedure for specifying the calculation of the residence time is as follows:

  1. Create a new sub-task.

      Create a sub-task

    1. Select Postprocessor as the sub-task type.

        Postprocessor

    2. When prompted, enter a name for the postprocessor sub-task.

  2. In the F.E.M. Task Postprocessor menu, select Residence time.

      Residence time

    Ansys Polydata will tell you where the calculation will be performed. You can click OK to continue.

  3. Specify the residence time along all entry sections. By default, sections that have an inflow boundary condition have a zero value for residence time.

    Important:  You must specify at least one residence time boundary condition.

    1. To specify the residence time on an entry section, select the appropriate No condition menu item and click Modify.

    2. Select the Value imposed option.

    3. Enter values for the constants , , , and to satisfy the equation

      (30–4)

      1. To modify the value of a constant, select the appropriate Modify menu item.

      2. Enter a New value for the relevant constant and click OK.

    4. Repeat to specify the residence time on other boundaries (if required).