SET_GES_VERSION

This command enables switching between the two versions of the Gibbs Energy System (GES) calculation engine. As of Thermo‑Calc version 2019b, GES6 is the default. Also see About the Gibbs Energy System (GES) Module.

GES6 is a re-write and new implementation of the Gibbs Energy System module of Thermo‑Calc and it is the default engine. The previous version, GES5, is still available and will continue to work in the background of the program where necessary. The main purpose of GES6 is to support faster development of new features. However, not all GES5 functionality is implemented in GES6. In such cases (except for the POURBAIX module), GES6 falls back silently and uses functionality from GES5 in the background.

Syntax	SET_GES_VERSION
Prompt	USE GES VERSION 5 OR 6 /6/: The default is version 6. If you change the version to GES5, it is set for the current session of Thermo‑Calc only. If you launch a new Console window, the version resets to GES6.
	To globally set the default from GES6 back to GES5, go to the Tools → Options →Global General Settings tab and click Version 5 for the Preferred Gibbs Energy System setting. This is useful if you are using the PARROT module (optimization) or if you have a custom database that is not compatible with GES6.

Syntax

SET_GES_VERSION

Prompt

USE GES VERSION 5 OR 6 /6/:

The default is version 6. If you change the version to GES5, it is set for the current session of Thermo‑Calc only. If you launch a new Console window, the version resets to GES6.

To globally set the default from GES6 back to GES5, go to the Tools → Options →Global General Settings tab and click Version 5 for the Preferred Gibbs Energy System setting. This is useful if you are using the PARROT module (optimization) or if you have a custom database that is not compatible with GES6.

Contact Thermo‑Calc Software AB at info@thermocalc.com for more information about the changes or if you encounter any issues you think are related to the new version of the calculation engine.