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ããAnalysis and Optimization on the Drag Reduction Characteristics of Car with Pit-type Non-smooth Surface
ãã[Abstract]Drag reduction characteristic of pit-type non-smooth car body surface is studied in this paper. Firstly the drag reduction effects of rectangle, thombus and equal-different pit arrangement are investigated, and the rectangular arrangement with better drag reduction effect is chosen. Then an optimization by the design of experiment with Latin Hypercube scheme is performed with the diameter and longitudinal and transverse spacing of pit as design variables and minimizing drag as objective. Next, the responses of different sample points are obtained by CFD simulation, and based on which a Kriging metamodel is built. Finally after the confidence of metamodel is verified a global optimization with the metamodel is conducted. The results show that a maximum drag reduction effect up t0 7.62% can be achieved with rectangular pit arrangement.
ããKeywords: car; pit-type non-smooth surface; drag reduction; CFD simulation; Kriging model; optimization
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