Table 1 Initial conditions used in ANSYS models. Temperature 27 °C Inlet Velocity inlet (1.5 m/s) Exhaust Pressure outlet (0 atm) Air curtain (config. ‘c’ only) Velocity inlet (11.5 m/s) Walls No slip, stationary Tolerance (x) 10−3 Tolerance (y) 10−3 Tolerance (velocity) 10−3 Tolerance (k) 10−3 Tolerance (ω) 10−3 Tolerance (energy) 10−6