Most　of　the　expressions　describing　fire　plumes　reported　in　the　literature　are　known　to　be　based　on　experiments.　Due　to　different　experimental　methods,　the　geometry　of　the　fire　sources,　fuel　types　and　surrounding　conditions,　it　is　difficult　to　derive　a　comprehensive　picture　of　a　plume　with　its　temperature　and　velocity　fields　on　the　basis　of　existing　theoretical　work.　Computational　Fluid　Dynamics　(CFD),　which　is　regarded　as　a　practical　engineering　tool　in　fire　engineering　by　the　experts,　is　sure　to　be　able　to　give　more　details　of　the　plume　behavior　under　various　situations.　Aerodynamics　for　thermally-induced　plumes　will　be　studied　numerically　with　CFD.　Four　typical　axisymmetric　plume　equations　will　be　assessed　in　this　paper,　and　investigations　will　be　useful　for　fire　engineers　in　designing　smoke　management　systems　in　an　affordable　fashion.　This　is　a　critical　point　in　implementing　engineering　performance-based　fire　code.