4.1.3 Calculation

Calculation

In the RWIND Simulation program, you can start the calculation with the following options:

• Select Start Calculation on the Simulation menu.
• Select Calculate Results in the panel.

You can follow the progression of the mesh generation and calculation in the panel.

The simulation iteratively determines the Residual Pressure until either the convergence criterion is satisfied or the maximum number of iterations is reached. Those limits are controlled by the Simulation Parameters settings (see the Chapter 'General').

You can interrupt the simulation at any time by clicking [Stop Calculation], for example to obtain the results at a specific residual pressure, or when there is no convergence. The results are then created for the current iteration (i.e. the next iteration after the interruption) and will be available for evaluation.

To proceed with the calculation, click [Continue Calculation] in the panel. This function is also available when the simulation was accomplished normally. In the Continue Calculation dialog box, you can then specify the new limit of iterations and/or convergence criterion.

This means that you can interrupt the calculation at any time, look at the intermediate results and continue the simulation if you wish. You can also increase the number of maximum iterations if the calculation was finished without having reached the stated residual. Note that the Continue Calculation function is not available after having closed the project.

If the [Stop Calculation] function does not terminate the calculation within 30 seconds, the text of the button is changed to [Cancel Calculation]. You can then use this button to abort the simulation. The Cancel Calculation function is also available in the Simulation menu. It immediately terminates all running calculation processes and deletes the temporary files. No results will then be available.

All calculation steps are recorded in a log file. To open this file, click the [Show Log Files] option, which is available in the Display Options of the panel or in the Simulation menu. The Log Files dialog box appears where you can check the details of each calculation step. If the calculation is running, the dialog contents and log files are continuously updated.

Pressing the [Open File Location] button opens the Windows File Explorer. The working directory where the log files are located is shown.

The calculation time largely depends on the global Mesh Density (see the Chapter 'Simulation Parameters') and the Level of Detail set for the simplified model (see the Chapter 'Edit Model').

For an effective and fast calculation, RWIND Simulation applies a parallel approach by using the cores of your computer in an optimal way. You can check the calculation settings in the Program Options dialog box which you can access via the Options menu.