  We study the evacuation dynamics of a crowd evacuating from a complex
geometry in the presence of a fire as well as of a slowly spreading smoke
curtain. The crowd is composed of two kinds of individuals: those who know the
layout of the building, and those who do not and rely exclusively on
potentially informed neighbors to identify a path towards the exit. We aim to
capture the effect the knowledge of the environment has on the interaction
between evacuees and their residence time in the presence of fire and evolving
smoke. Our approach is genuinely multiscale - we employ a two-scale model that
is able to distinguish between compressible and incompressible pedestrian flow
regimes and allows for micro and macro pedestrian dynamics. Simulations
illustrate the expected qualitative behavior of the model. We finish with
observations on how mixing evacuees with different levels of knowledge impacts
important evacuation aspects.
