We are proud to announce that Dymola 2025x Refresh 1 will be generally available on 18 April 2025. 

Simulation

• Simplified parameter optimization user interface
• Enhanced Monte-Carlo simulation
• Improved generation of analytic Jacobian

Model development

• Further improved unit checking
• No code generation that does not affect outputs (optional)
• More accurate parallelization for external functions

Environment

• Download and install libraries from GitHub
• Meta data to support creating the Commands menu in Dymola

https://youtu.be/CZlOMEUdaLI?si=w-yEV9yIhReFh4Cm

Parameter optimization

A new user interface for parameter optimization is available in Dymola 2025x Refresh 1. It uses simple drag-and-drop to set up tuner parameters, criteria variables and the optimization algorithm.

Up to three parameters can be optimized with the standard Dymola license, more require the Optimization option (DOZ-x).

Monte Carlo simulation

Monte Carlo simulation in Dymola has been enhanced to allow analysis of the entire simulation trajectory, plotting mean value, standard deviation and the prediction interval.

We have also implemented box plots of the observed variable and general sensitivity analysis with Sobol Indices. In addition, an improved random number generator with Latin Hypercube sampling is used by default.

Install libraries from GitHub

Dymola allows you to directly browse and install Modelica libraries from GitHub.

• Type search keyword to get selection of libraries.
• Select a release.
• Install.