33.17 Run Calculation Task Page

The Run Calculation task page allows you to start the solver iterations. See Sections  26.11 and 26.12 for details about the items below.

Controls

Check Case...   opens the Case Check dialog box.

Preview Mesh Motion...   opens the Mesh Motion dialog box.

Number of Iterations   (for steady flow calculations) sets the number of iterations to be performed. (For unsteady calculations using the explicit unsteady formulation, this will specify the number of time steps, since each iteration will be a time step.)

Time Stepping Method   (for transient flow calculations) contains options for how the time step is determined.

Fixed   selects a fixed time step, equal to the specified Time Step Size.

Adaptive   selects a time step that is initially equal to the specified Time Step Size, but gets modified by ANSYS FLUENT as the calculation proceeds. See Section  26.12.2 for details.

Variable   enables variable time stepping method. The inputs are same as for the adaptive time stepping method, with the exception of specifying a global Courant number. Variable is selectable when the VOF multiphase model is enabled. See Section  26.12.3 for details.

Settings...   opens either the Adaptive Time Step Settings dialog box when Adaptive is selected as the Time Stepping Method, or the Variable Time Step Settings dialog box when Variable is selected as the Time Stepping Method.

Time Step Size(s)   (for transient flow calculations) sets the magnitude of the (physical) time step $\Delta t$.

Time Step Size for Acoustic Data Export   determines the highest frequency that the acoustic analysis reproduces. This is available when the FW-H acoustics model is enabled.

Number of Time Steps   (for transient flow calculations) sets the number of time steps to be performed.

Options   contains options related to unsteady calculations.

Extrapolate Variables   instructs ANSYS FLUENT to predict the solution variable values for the next time step and then input that predicted value as an initial guess for the inner iterations of the current time step.

Data Sampling for Time Statistics   enables the sampling of data during an unsteady calculation. See Sections  26.12.1 and 26.12.4 for details.

Sampling Interval   allows you to specify the frequency of the Data Sampling for Time Statistics.

Sampling Options...   opens the Sampling Options dialog box for the Data Sampling for Time Statistics.

Max Iterations/Time Step   for unsteady flow calculations using an implicit unsteady formulation) sets the maximum number of iterations to be performed per time step. If the convergence criteria are met before this number of iterations is performed, the solution will advance to the next time step. See Section  26.12.1 for details.

Reporting Interval   sets the number of iterations that will pass before convergence monitors will be printed and plotted. The default is 1 (i.e., reports will be updated after each iteration).

Profile Update Interval   sets the number of iterations that will pass before user-defined functions for boundary profiles, properties, etc. will be updated.

Solution Steering   allows you to set parameters that will help ANSYS FLUENT guide the calculations to a converged solution (available only for steady-state flows in the density-based implicit solver). See Section  26.19 for more information. When enabled, the following options are available:

Flow Type   allows you to select the flow type that best describes the flow in the solution domain. Five choices are available: incompressible, subsonic, transonic, supersonic, and hypersonic.

Use FMG Initialization   allows for full multigrid initialization.

First to Higher Order Blending   allows you to reduce the desired solution accuracy by selecting a blending factor less than 100%. The default setting is 100%. See this section in the separate Theory Guide for more information. The blending factor will be grayed out if Second Order Upwind discretization for the Flow equations is not selected in the Solution Methods task page. The solution accuracy may be reduced (typical values are 75% or 50%) if it is not possible to obtain a converged solution with the maximum second-order accuracy (i.e. blending = 100%)

More Settings...   opens the Solution Steering dialog box.

Courant Number   is a non-adjustable field displaying the current CFL number, which allows you to view it during the calculation.

Data File Quantities...   opens the Data File Quantities dialog box.

Acoustic Signals...   opens the Acoustic Signals dialog box. This button is only available when the acoustics model is enabled.

Calculate   starts the calculations. While the calculation is in progress, a Working dialog box will appear. Clicking the Cancel button or typing <Control-C> in the console window will interrupt the calculation (as soon as it is safe to stop).