Our CFD software evaluates how geometries and terrain affect cloud dispersion and fires

KFX is a CFD software that harnesses the power of computational fluid dynamics (CFD) to precisely model dispersion and fires in various scenarios. 

Featuring computer-aided design (CAD) and topography import capabilities, KFX automatically converts geometries for seamless integration with the calculation models, ensuring an efficient and accurate representation of the impact of 3D geometries on the CFD simulations.

Screenshot from KFX software, showing dense gas dispersion in a terrain
Dispersion of dense gas taking into account terrain and topography

Assess the impact of fire mitigation measures and optimize passive fire protection (PFP)

The KFX software provides comprehensive simulations of water-based fire mitigation techniques, including deluge, monitors, mist and water curtains, in complex systems and congested areas while accounting for weather effects. 

Additionally, data from the KFX software can be used as input to USFOS, a simulation software dedicated to analysing structural response to accidental loads resulting from fires and explosions.

Screenshot from KFX software, showing the influence of a deluge system on a fire scenario
Heat flux to piping equipment with deluge system

Use KFX to optimize layout and facility siting

Advanced dispersion and fire modelling using the KFX software can predict dispersion cloud behaviour, helping to assess exposure to toxicity (for a toxic gas accidental release) or radiation (for a flammable gas accidental release) in open or enclosed areas. 

The KFX software simulates ventilation, whether natural or forced, and can therefore help with layout optimization.

Screenshot from KFX software, showing toxic cloud dispersion at an onshore facility
Toxic cloud dispersion at an onshore facility

Support for a safe energy transition with advanced CFD simulations

Our CFD software has been continuously developed for over 40 years through joint industry projects (JIPs), including to support transport and storage of hydrogen and ammonia and for carbon capture and storage (CCS). 

Learn more about our three ongoing CFD simulation software JIPs: Hydrogen CFD simulation software, Ammonia CFD simulation software and CO2 CFD simulation software

Screenshot from KFX software, showing the formation of a two-phase CO2 release from a pipeline
Two-phase CO2 release

From 7146 EUR per month

From 7146 EUR per month

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KFX software pricing and licencing

Licensing plans available for local installation on your PC or network for single / multiple concurrent users. 

Access available from 1 month to perpetual licence.


From 7146 EUR per month

From 7146 EUR per month

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KFX software training

We offer a technical software course to help you get the most out of our product. You can join us face to face, online or book a private training course.

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Join the organizations using KFX and EXSIM for computational fluid dynamics analysis

KFX and EXSIM - CFD simulation software for dispersion, fires and explosions - customer logos

Frequently asked questions

What are the principles and concepts behind the KFX software simulation?

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KFX utilises a finite volume technique to solve the Navier Stokes equations, incorporating three-dimensional (3D) and transient simulations. KFX utilises the porosity technique, enabling the resolution of objects smaller than the grid cells and making the code highly efficient. Moreover, the Eddy Dissipation Concept (EDC) serves as the foundation for combustion modelling in KFX.

How does KFX/EXSIM differentiate its software capabilities from other CFD software?

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KFX/EXSIM is specifically developed for safety-related applications, addressing scenarios such as gas dispersion, fires, explosions, and other industrial challenges. Its features include the porosity technique, Lagrangian model for droplet releases, the ability to handle multiple simultaneous releases in a single model, and seamless integration with Finite Element software for structural response analysis. 

Extensive usage and testing in numerous industry studies, both by DNV and external customers, have established KFX as a robust and stable simulator. Furthermore, the software has been developed in close collaboration with industry partners to best understand and address industrial needs efficiently and accurately. Notably, ongoing advancements include an advanced liquid CO2 release model that accounts for complex thermodynamics, two-phase releases, dry-ice formation and deposition, as well as obstacles, terrain, and wind conditions.

What are the unique selling points of KFX/EXSIM?

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The competence behind KFX/EXSIM is the result of four decades of focused research, continuous development of fire simulation software, and consultancy work within turbulent flow and combustion, with funding from industry and the Research Council of Norway. Widely used in the industry, KFX/EXSIM is a leading CFD simulator for dispersion, fire, and explosion simulations. Extensive validation has been conducted, ensuring accurate results, and ongoing validation is based on experiments carried out in DNV Spadedam and with industry partners. KFX includes advanced Lagrangian models for fire mitigation and extinction using various water systems. It is also seamlessly interfaced with the KFX Usfos finite element structure response code, enabling non-linear dynamic structural response analysis. Additionally, KFX offers powerful CAD and topography import capabilities, allowing for automatic conversion of CAD geometries and easy handling of electronic maps. DNV's collaboration with industry partners on Joint Industry Projects (JIPs) focused on hydrogen, ammonia, and CO2 safety further enhances the software, with research results from these projects being integrated into KFX.

What is computational fluid dynamics?

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Computational fluid dynamics (CFD) is the use of numerical methods to analyse fluid flows, helping predict flow patterns, heat transfer and chemical reactions. It leverages algorithms and computational resources to simulate how fluids interact with physical boundaries.

What is a CFD software?

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CFD software facilitates the simulation and analysis of fluid flow, allowing engineers to visualize and predict fluid dynamics in various environments. It includes tools for setting up simulations, solving fluid dynamics equations and visualizing the results for interpretation. 

What is PFP?

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Passive fire protection (PFP) refers to the use of materials and systems designed to prevent or slow the spread of fire, maintaining the structural integrity of equipment without active intervention. It includes coatings, fireproof cladding and insulation that provides thermal protection to maintain the equipment's functionality during a fire.

What is DNV's validation and verification process for KFX/EXSIM?

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Testing of the software includes:  

  1. Verification of the consequence models to ensure that the code correctly solves the associated mathematical model  
  2. Validation of the results against experimental data 
  3. Sensitivity analysis by varying a large number of parameters to ensure overall robustness of the code 

DNV has produced a document describing the verification and validation process for the KFX/EXSIM software. This is available upon request. 

What are the system requirements for KFX/EXSIM?

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The recommended specification for KFX/EXSIM is as follows: 


No Citrix, Microsoft, Oracle VirtualBox, VMware virtualization tools, e.g. XP mode on Windows7, are supported. 

Product information

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