Numerical Study on the 3-D Flow of Airfoil-Flat Plate Combination with Gap

Flow through object phenomena is very important subject in aerodynamics. This
phenomenon gave more information towards fluid flow characteristics and its form
formation. The evidence oftwo dimensional history flows was strongly influenced three
dimensional flow characteristics. The complexity of 3-D flow around airfoil-flat plate
combination with gap has attracted many researches. Twotypes of airfoil (symmetrical
and non-symmetrical) and variation of gap thickness clearance be used through the
study. Inlet velocity of 25m/s as initial condition while air density and viscosity is
constant being used. Through pressure coefficient contour, several things being analyze
such as pressure coefficient of the airfoil-flat plate, pressure distribution at the wall,
pressure difference between upper and lower side of airfoil-flat plate, pressure gradient
and where the saddle point form. Fromthe result, it can see that symmetrical airfoil-flat
plate have same pressure distribution between upper and lower side of airfoil-flat plate
while for non-symmetrical airfoil-flat plate, the lower side pose higher pressure
distribution compared to the upper side of the airfoil-flat plate. This cause pressure
difference and strongeradverse pressure gradienthappen at non-symmetrical airfoil-flat
plateeven at angle of attack 0°. Saddle point is formed further away in front of leading
edge and tends to move on pressure side below for non-symmetrical airfoil-flat plate.
The effects of gap become clearer with using non-symmetrical airfoil-flat plate when
the emergence oftip gap vortex especially near the rear tip towards the wall.