In FDS, an obstruction is a three-dimensional solid object that blocks flow. In addition, there are constraints on the geometry of the obstruction when calculating heat transfer through an obstruction. The one-dimensional assumption does introduce limits.įor example, local heating of an obstruction will not spread radially and heating one side of an obstruction will not heat adjacent sides. One-dimensional Heat ConductionĪ common point of confusion when discussing heat conduction in FDS is that FDS only performs a transient, one-dimensional calculation of heat transfer.įor most fire simulation situations, this is a computationally fast and appropriate approximation of real heat conduction.įor example, the surface temperature of a hollow wall constructed of gypsum board is well represented by transient, one-dimensional heat conduction through the gypsum board with an assumed air gap boundary condition on the back of the gypsum board. This post demonstrates heat transfer through obstructions, including radiative and convective fluxes on the surface. With proper modeling, you can couple the front and back face temperatures of an obstruction so that heat flows through the obstruction. IntroductionįDS assumes one-dimensional heat conduction into the surfaces of solid obstructions. To follow along with this tutorial, download the relevant files here. Created with software version: 2020.1 Table of Contents
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