## Concentration / Run Model

Once the Concentration Setup menu has been closed with the Save button, the changes to the simulation parameters are copied to default_conc. Clicking on the Run Standard Model menu tab first copies default_conc to CONTROL and then runs the trajectory model executable, hycs_std. The executable, by default, attempts to open a file named CONTROL to read all the required input parameters. If not found, the model will prompt to standard output for values from standard input. This condition should not occur running the model through the GUI.

In the situation where the namelist file SETUP.CFG has been created through the Advanced/Configuration menu tab, the message shown below will appear. If the intent was to run using this file, then continue, otherwise one can delete the file and run, or terminate the simulation. The situation may arise that the namelist file was created for a previous simulation and is not needed this time.

When the model execution starts, output messages are written to a special window. Successful completion of a simulation will show a message similar to the example shown in the illustration below:

Additional run-time diagnostic messages and other error messages are always written to a file called MESSAGE. This file may be viewed through one of the Advanced Menu tabs. Depending upon the nature of the error message, perhaps a failure in the model initialization process, error messages may also appear in above window. Once the model has completed, press Exit to close the window.

Sometimes a configuration (long duration, very fine grid, too many particles) will lead to extremely long run times, perhaps requiring the model to be terminated prematurely. Closing the GUI will not terminate the simulation because it always runs in background. In this situation it is necessary to use the cntl-alt-del key combination (Windows) to find and kill the hycs_std executable.

Table of Contents