TY  - JOUR
T1  - Active Technique by Suction to Control the Flow Structure over a Van Model
AU - , Harinaldi AU - , Budiarso AU - , Warjito AU - Kosasih, Engkos A. AU - Tarakka, Rustan AU - Simanungkalit, Sabar P. 
JO  - Journal of Engineering and Applied Sciences
VL  - 7
IS  - 2
SP  - 215
EP  - 222
PY  - 2012
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2012.215.222
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2012.215.222
KW  - Active flow control
KW  -suction
KW  -aerodynamic drag reduction
KW  -reversed Ahmed body
KW  -load cell
KW  -Indonesia
AB  - Today research trend in car aerodynamics are carried out from the point of view of the durable
development. Some car companies have the objective to develop control solution that enable to reduce the
aerodynamic drag of vehicle. It provides the possibility to modify the flow separation to reduce the
development of the swirling structures around the vehicle. In this study, a family van was modeled with a
modified form of Ahmed’s body by changing the orientation of the flow from its original form
(modified/reversed Ahmed body). This model was equipped with a suction on the rear side to comprehensively
examine the pressure field modifications that occur. The investigation combined computational and experimental
work. The computational simulation used k-epsilon Flow Turbulence Model. The reversed Ahmed body used
in the investigation had slant angle (φ) 35° at the front part. In the computational work, meshing type was
tetra/hybrid element with hex core type and the grid number was >1.7 million in order to ensure detail
discretization and more accurate calculation results. The boundary condition was upstream velocity of
11.1 m sec<sup>-1</sup>. Mean free stream at far upstream region was assumed in a steady state condition and uniform. The
suction velocity was set at 1 m sec<sup>-1</sup>. Meanwhile in the experimental work a reversed Ahmed model was tested
in a controlled wind tunnel experiments. The main measurement was the aerodynamic drag force measurement
at rear of the body of the model using load cell. The results showed that the application of a suction in the rear
part of the van model gave the effect of reducing the wake and the vortex formation. Aerodynamic drag
reduction close to 24% for the computational approach and 14.8% for the experimental approach by introducing
a suction had been obtained.
ER  -