Introductory Of Dimple To Ahmed Body Top Surface As A Drag Reduction Device By Using DoE Appraoches

Beh, Eik Zhen (2017) Introductory Of Dimple To Ahmed Body Top Surface As A Drag Reduction Device By Using DoE Appraoches. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) Introductory Of Dimple To Ahmed Body Top Surface As A Drag Reduction Device By Using DoE Appraoches.pdf - Submitted Version Download (822kB)

Abstract

Buses are one of the important public transport for nowadays.The large size of the bus experienced a large aerodynamics drag when travelling in long distance at high speed.The objectives of this research is to optimize the introductory of dimple on the top surface of Ahmed Body to decrease the drag coefficient by using Design of Experiment (DoE) approaches and to investigate fuel consumption reduction using the parameter analyzed from the optimized drag coefficient.First,a geometry design called Ahmed Body was chosen to simulate in this research because it is a simple 3D bluff body representing a very simplified car (Beaudoin & Aider,2008).A benchmark model of Ahmed Body with some changes of no back slant angle was developed in order to represent the actual geometry of bus and it was simulated in virtual wind tunnel test to obtain the benchmark drag coefficient. In the part of DoE,four factors with each factor has two parameters were listed down.By applying two level factorial design,16 possible combinations of the matrix design were developed and simulated in virtual wind tunnel.The results obtained was been carried out the optimization process in order to determine the best combination design that has the least drag coefficient.The design model with the dimension of dimple shifting of 104.4mm,39.7mm diameter of dimple, 4.06m2 dimple coverage area and the depth of 2mm for the dimple was been selected as the optimized model.The optimized model of Ahmed Body was simulated in virtual wind tunnel and it showed that about 36.5% drag coefficient was reduced and this helped to reduce 18.54% of fuel consumption if the optimized design was applied to real bluff vehicle such as bus.Finally,this research has successful achieved the objectives through adding dimple on the top surface of Ahmed Body.

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