 The Wildland-Urban Fire Dynamics Simulator (WFDS) is an extension developed by the US Forest Service that is integrated into FDS and allows it to be used for wildfire modeling.It models vegetative fuel either by explicitly defining the volume of the vegetation or, for surface fuels such as grass, by assuming uniform fuel at the air-ground boundary.FDS is a Fortran program that reads input parameters from a text file, computes a numerical solution to the governing equations, and writes user-specified output data to files.