Field modeling is the branch of applied mathematical modeling that fire dynamics is concerned with. The analysis of the behavior of fire begins with the consideration of the fundamental laws of fluid mechanics and heat transfer as encapsulated in the laws of conservation mass, momentum, and energy. This, together with other concepts and equations that supplement the field modeling approach, is the fundamental basis of the field modeling of fire. Since most fires are gaseous by nature, the concern with the static and dynamic behavior of the gases as a continuous fluid with open boundaries is frequently encountered.
Practical fires are generally turbulent. Even at the present level of research computational capacity, it is still not feasible to solve the conservation equations directly to the required accuracy. Turbulent flows are extremely complex time-dependent flows, and to resolve such flows, the use of turbulence models has proven to be reasonably satisfactory. A variety of models are described in this chapter to differentiate their applicability and usefulness to field modeling.
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