An asymptotic computational method (ACFD) to account for variable property effects is applied to a complex benchmark geometry. The method is based on the Taylor series expansion of all properties with respect to temperature and provides general results, applicable to specific problems with different fluids and heating rates. It can take into account the temperature dependence of all physical properties involved in momentum and heat transfer problems. The benchmark is a room which is ventilated by forced convection through inlet and outlet slit nozzles at the top and bottom of the side walls. Four heating elements standing on the ground floor add heat with constant heat flux density of variable strength. CFD solutions with the full coverage of all property temperature dependencies of air and SF6 are compared with the general ACFD results, applied to these fluids.

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