LARGE EDDY SIMULATION PADA NACA 4412 DENGAN MEMPERTIMBANGKAN GROUND EFFECT

Adi Setyanto, Bagus (2023) LARGE EDDY SIMULATION PADA NACA 4412 DENGAN MEMPERTIMBANGKAN GROUND EFFECT. Thesis thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Wing in Ground Effect Aircraft WIG is an aircraft that in operation uses ground effects on water or other flat surfaces. This aircraft relies on aerodynamic lifting forces generated by wings and fuselages that aim to take advantage of ground effects. Ground effect is the phenomenon of increasing the lifting force lift and decreasing the drag force produced by the wing of an aircraft when flying close to a relatively flat surface. This phenomenon can result in increased aerodynamic efficiency in aircraft. In this study, a simulation was carried out to determine the effect of ground effect on aerodynamic characteristics on the NACA 4412 air foil using the LES turbulent model. The results of this study are in the form of coefficient lift CL, coefficient drag CD, mean velocity on the upper leading edge and trailing edge airfoil, eddy viscosity on the upper leading edge and trailing edge airfoil, velocity contour and pressure contour. The discussion focused on the value of mean velocity and eddy viscosity. The CL and CD values are used to perform simulation validation of the experiment. Based on the simulation results, variations in height and angle of attack AOA affect the aerodynamic characteristics of the NACA 4412 airfoil. At 0.2c it has the highest mean velocity value of 0.994 m su at the leading edge and 0.229 m su at the trailing edge at x C = 0 airfoil. This means that at an altitude of 0.2c and AOA=8 the NACA 4412 airfoil has a high coefficient lift CL value. However, at the same time, the eddy viscosity value at the same point has a value of 182.229 x 10−6 m2 s on the trailing edge of the airfoil. The high value of eddy viscosity is due to the large difference in flow velocity on the upper surface and lower surface airfoil that meet at the trailing edge and cause the formation of eddies.

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