# Software limitations

22/07/2017 11:49

The software is based on a semi-empirical analytical approach. The semi empirical equations are used to calculate the following:

Many different numerical schemes are used in the software to obtain convergence of the equations. There may be some cases where numerical instabilities may occur and the solution process will fail. There are, however, corrective measures implemented in the code that automatically prevents these instabilities. It must be stressed that these cases are very rare. A user familiar with the software can solve the numerical instabilities when they occur by changing the solution control parameters. This is similar to steps taken to ensure stable solutions in CFD software packages.

- Airflow loss coefficients through the different components of the tower.
- Transfer characteristics (Merkel Numbers) in the different transfer zones and especially in the rain zone.

Many different numerical schemes are used in the software to obtain convergence of the equations. There may be some cases where numerical instabilities may occur and the solution process will fail. There are, however, corrective measures implemented in the code that automatically prevents these instabilities. It must be stressed that these cases are very rare. A user familiar with the software can solve the numerical instabilities when they occur by changing the solution control parameters. This is similar to steps taken to ensure stable solutions in CFD software packages.