GGU-CONTAM-RW: "Start" menu item

After clicking this menu item or, alternatively, by pressing [F5], a dialog box opens showing the names of the output files.

• Record 1 ("plgw_ras.plw")
  contains all results from the rectangular array. So, during subsequent evaluation using the GGU-PLGW application, a rectangular triangle mesh is displayed.

• Record 2 ("plgw_fe.plw")
  contains the values from the rectangular array recalculated to fit the triangular mesh (FEM mesh).

Start your analysis by clicking "OK". Several basic parameters are first calculated. The following dialog box is subsequently displayed:

Generally, a flood of result values is generated during analysis. You can define an interval (i) for data output. In addition, you must also enter the end time for the analysis.

The precision of all numerical procedures is influenced by the size of the time step. More precise results can be achieved with small time steps, but modelling time increases correspondingly. The maximum allowable time step size can be derived from the "Courant criterion". You can modify this time value but should not increase the proposed time step.

You then enter the number of particles to be started and whose paths are to be traced. By activating the "Graphical representation of path lines" check box the path lines can be traced on the computer screen during analysis (very impressive, but also increases computation time).

Finally, you have the opportunity of suppressing output of data for recalculation of the array data to the triangular mesh (FEM mesh).

After selecting the "OK" button the calculation proper will begin. A dialog box with a "Cancel" button will inform you of analysis progress. If you select this button, analysis will not cease immediately, but instead you can edit specific program data and then carry on the analysis.

The record is generated for the evaluation application during modelling. If, after commencing modelling, you open the GGU-PLGW program, you can check and evaluate the current results while modelling is still in progress. The "Animation" function is particularly impressive here; it can be executed parallel to the running modelling process.