Field models

KFX® is developed for 3D and transient fire and gas dispersion simulations. The governing equations that have to be solved are partially differential equations (PDE) describing the transient behavior of the different field variable in space. The PDE describing fluid flow are commonly referred to as transport equations because they have the same type of terms

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Turbulence

The nature of turbulent flow is irregular with rapid fluctuations in velocity, density, temperature, and composition. This fluctuating nature makes turbulent flow highly diffusive resulting in enhanced transport of momentum, mass, and energy.

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The Eddy Dissipation Concept (EDC) Combustion model

The EDC turbulence combustion model by Magnussen, is the combustion model used in KFX®.

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The EDC Soot Model

The Soot model used in KFX® is according to the EDC soot model by Magnussen. The soot formation model is based on the work by Tesner on soot formation in acetylene flames, which is generalized to handle different types of hydro carbons.

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Radiation model

The radiation model in KFX® is based on the Shah and Lockwood model. This model is often referred to as the Discrete Transfer model (DTM). The KFX® version of the model has many innovative extensions that enable efficient and accurate calculation of radiation exchange between gas and smoke and surrounding solid objects.

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The Spray model

During the lifetime of the droplets they interact with the surrounding gases. Seen from the gas phase the droplets cause a distributed source of mass, momentum and energy, while seen from the liquid phase the gas acts on the droplets moving them around and make them evaporate and loose their mass.

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The Pool model

The objective of the pool model used in KFX® is to have an evaporation model that is dependent on the heat fluxes generated by the fire. In addition a pool spread model is required such that a realistic pool development from a leak source is properly modelled.

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Boundary condition models

The KFX boundary models consists of 5 different models.

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