The latest software version
- 28 Jul 2025
- 1 Minute to read
The latest software version
- Updated on 28 Jul 2025
- 1 Minute to read
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FLACS 25.2 expands the modelling capabilities engineers rely on for accurate, reliable consequence analysis.
This release introduces a major new feature: a dynamic water spray/curtain model with fully coupled Lagrangian droplet tracking. This enables detailed evaluation of water-based mitigation systems for toxic and flammable gas dispersion, and includes absorption of ammonia into the water stream.
It also reintroduces inert stream support, allowing users to model the injection of an inert gas in addition to air and fuel releases. Through significant performance and memory improvements, FLACS 25.2 delivers a faster, more capable CFD tool.
Dynamic water spray model
Simulates water sprays using Lagrangian particle methods.
Fully coupled with the flow to capture impact on gas dispersion.
Includes ammonia absorption into water droplets.
Enables direct analysis of water curtain systems for mitigation of toxic gas releases.
Supports safety case development and design verification of mitigation systems.
Allows testing of system effectiveness in real geometry, wind, and release conditions.
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Results showing water droplet velocities
This enables users to:
Evaluate and optimise water spray and curtain systems in detail.
Support compliance with mitigation requirements in risk assessments.
Reduce conservative assumptions by modelling mitigation directly.
Improve credibility and transparency of safety studies.
Inert stream support
Re-introduced capability to model an inert gas stream alongside air and fuel.
Supports both cloud and leak scenarios.
Enables simulation of inerting systems to suppress explosions or limit flammable cloud formation.
Allows analysis of dilution effectiveness under site-specific conditions.
Enabling users to:
Assess the impact of inert gas systems in reducing explosion risk.
Support more realistic, less conservative design options.
Justify mitigation measures to regulators and stakeholders.
Performance improvements
Significant reduction in memory usage and faster execution for cases with large meshes or many control volumes (over one million).
Optimised restart dump writing to reduce simulation overhead.
Resulting in:
Enabling larger, more complex models without hardware bottlenecks.
More efficient studies with many scenarios or high-resolution grids.
Reduced costs and time in project delivery.
FLACS Geometry Calculator (FGC) improvements
Reduced memory consumption for geometries with many small meshes.
Improved porosity calculator accuracy.
Fixed blockage errors in complex structures such as tunnels and caves.
Enabling:
Modelling of complex industrial layouts more reliably.
Reduced manual correction and quality assurance workload.
Improved confidence in blockage and porosity data for explosion modelling.
CASD improvements
Minor usability refinements, including ongoing multi-scenario improvements.
Incremental changes supporting easier model setup.
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