FLACS 25.4 is now live
FLACS 25.4 focuses on improving workflow quality, model behaviour and overall performance across the software, with a strong emphasis on how users run and manage large, study-based simulation work in practice.
At the centre of the release is a major workflow update: the standalone FLACS-Risk module is now deprecated.
Risk workflows are now fully integrated into the core FLACS applications. Studies are set up using the MultiScenario feature in CASD, the FLACS modelling environment where users build facility layouts and define scenarios. Results and risk calculations are then analysed in Flowvis, the FLACS environment for visualising and interpreting simulation results.
Risk workflows are now part of the core FLACS workflow
From FLACS 25.4 onwards, MultiScenario becomes the default workflow for projects that involve setting up and running multiple scenarios together.
In practical terms, this means:
- No loss of existing risk calculation capability
- More flexibility for different workflows and sensitivity studies
- Scenario generation, aggregation and post-processing remain fully supported
- Improved usability and stability for large and complex studies
By moving risk workflows directly into the main FLACS applications, users can manage scenario setup and result analysis more consistently within a single environment.
Model improvements and performance updates across the platform
Alongside the workflow changes, FLACS 25.4 delivers a range of improvements to the platform’s calculation models, physical modelling and overall performance.
Key updates include:
- Improved water spray modelling
- Fixes to inert solver edge cases
- Automatic detonation transition now supported for ethylene
- New output to track detonation activation
- Faster radiation model performance
These updates further strengthen the reliability and efficiency of consequence modelling for fire, gas dispersion and explosion studies.
Enhancements to MultiScenario workflows
MultiScenario has been extended to better support study setup, data handling and large scenario sets:
- 3D view now auto-updates when geometry or grid changes
- Improved leak handling
- Clearer and more detailed error reporting
- New autogrid configuration options
- Ability to reuse autogrid setups across multiple exports
- Option to generate unique job numbers
- Table search and filtering
- Support for user-defined species
These changes aim to reduce manual rework and improve transparency when managing complex scenario libraries.
Expanded automation support through the Python API
Automation capabilities have also been strengthened in FLACS 25.4:
- Python modules are now installable via pip
- Improved support for common development environments
- Tooltips and code completion to assist scripting and workflow automation
This makes it easier to integrate FLACS into internal workflows and automated study pipelines.
Performance and usability improvements
Several updates focus on faster interaction and smoother handling of large projects:
- Faster 3D plotting in Flowvis
- Reduced file loading times
Cloud workflow updates
For users running studies in cloud environments, FLACS 25.4 introduces:
- Bulk delete functionality
- CPU usage reporting
- Support for external compute nodes
These updates improve resource visibility and operational efficiency when running large simulation campaigns.
Autogrid updates
Autogrid has also been enhanced with:
- General user interface improvements
- Experimental blast guidelines
- Multi-directional leak support
Get access to FLACS 25.4
Existing users will be able to download the new software update by clicking on the button below.
