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CFD Analysis Of Centre Air Vents Of Passenger Car
Air conditioning has become one of the primary requirements in most of the vehicles. Passenger thermal comfort is mainly influenced by the inside cabin temperature. A study has been done by our engineers for a given design of Centre air vents of a passenger car.
Objectives of the CFD simulations were as mentioned:
  • To visualize the air flow directivity inside the passenger cabin
  • To study the effect of vent orientation on the flow directivity through air vents
  • To assess the air flow parameters against the target values
        As the blower is not considered for simulation, the mass flow rate is given to HVAC inlet. Flow rate of 6.2 m3/min (372 CMH) is initialized for the simulation. Air Density = 1.225 Kg/m3, Dynamic Viscosity = 1.789 e-5 Kg/m-sec.
As it is difficult to assure that the CFD results for the first run are correct, a grid independence study was done to monitor the results for different grid sizes. Grids consisting of 5, 9, 12 and 15 million tetrahedral cells were used for airflow analysis and the maximum velocities at the mannequin face were compared.
In order to meet the target values, no.s of iterations were done in the design of Air vents to achieve the target values.