### 21.1.4. Transient Statistics Tab

The Trn Stats tab for the `Output Control` object contains settings that specify the transient statistics data to be included in the results files; for details, see Working with Transient Statistics.

#### 21.1.4.1. List Box

This list box is used to select `Transient Statistics` objects for editing or deletion. `Transient Statistics` objects can be created or deleted with the icons that appear beside the list box.

#### 21.1.4.2. [Transient Statistics Name]

##### 21.1.4.2.1. Option

The following statistics are evaluated at each node over the history of the simulation:

- `Arithmetic Average`

- `Minimum`

- `Maximum`

- `Standard Deviation`

- `Root Mean Square`

- `Full`

##### 21.1.4.2.2. Output Variables List

See Output Variables List.

If a selected output variable is a vector or a tensor, the selected operation Option is applied to each component of the variable separately. The result for each component is included in the results file. For example, if `Velocity` is selected as a variable, using the `Maximum` option, the results file will include the maximum value of each of the three velocity components. Note that the maximum value of each of the components will likely have occurred at different times during the simulation. Also note that the magnitude of the resulting velocity components will not be the same as the maximum of the velocity magnitude (the latter can be determined by using the `Maximum` option for an additional variable defined to be the velocity magnitude).

##### 21.1.4.2.3. Start Iteration List Check Box

This check box determines whether or not a Start Iteration List is used. If this check box is cleared, statistics will start (or continue, for restart runs) accumulation during the first timestep of the current run.

###### 21.1.4.2.3.1. Start Iteration List Check Box: Start Iteration List

Enter a comma-separated list of iteration numbers corresponding to the variables selected in the Output Variables List. If the start iteration list contains fewer entries than the Output Variables List, then the final start iteration in the list is applied for all remaining output variables.

The start iteration for a given transient statistic specifies the timestep index at which statistic accumulation begins. Prior to that timestep, statistics are initialized, as outlined in Working with Transient Statistics.

Note: In the case of restarted transient runs, iteration numbers are interpreted as the total accumulated timestep index rather than the index for the current run.

##### 21.1.4.2.4. Stop Iteration List Check Box

This check box determines whether or not a Stop Iteration List is used. If this check box is cleared, the statistics will continue accumulation until the end of the run.

###### 21.1.4.2.4.1. Stop Iteration List Check Box: Stop Iteration List

Enter a comma-separated list of iteration numbers corresponding to the variables selected in the Output Variables List. If the stop iteration list contains fewer entries than the Output Variables List, then the final stop iteration in the list is applied for all remaining output variables.

The stop iteration for a given transient statistic specifies the timestep index at which statistic accumulation ceases. After that timestep, statistics are simply not modified.

Note: In the case of restarted transient runs, start and stop iterations are interpreted as the total accumulated timestep index rather than the index for the current run.

Release 18.2 - © ANSYS, Inc. All rights reserved.