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Velocity profile and its magnitude affect greatly to defrosting and demisting in the windshield. In this paper, the three dimensional flow analysis in the defrost nozzle which is geometrically complicated was performed to investigate and predict velocity profile of the nozzle outlet. The three dimensional Navier-Stokes code used in this case was validated by performing Of the generic A/C duct flow analysis successfully. The results of defrost nozzle flow analysis nearly coincided with experimental data. Based on the standard case, design factors were applied. Flow analysis was carried out with three different number of the guide vanes. The angle of the guide vane was applied to the nozzle outlet also. In the flow simulation inside the automotive, inlet velocity was provided by a exit velocity of the defrost nozzle. The investigation of the each case informed us which case could produce the best velocity profile to defrost. Through these procedure, the optimized design factor was found. Further more, this three dimensional incompressible code will be used to predict and compare with any kind of defrost nozzle flow.

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UCI(KEPA) : I410-ECN-0101-2009-556-014008395