الفهرس 
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Abstract
The present work is including ten different cases, each case is individually
designed and applied on the selected NACA 4412 airfoil which is commonly
used in high lift wind turbine blades. Every case is simulated using suitable
computational fluid dynamics computer package. Series of calculations are
used on the available resources and information to evaluate the impact of the
standard NACA4412 airfoil modifications on both stall angle and cut-in
speed.
In all cases, chart contours of lift force, drag force, static pressure, pressure
coefficient, and lift to drag ratio are presented. Velocity magnitude
distribution is plotted using both contours and vectors.
The work went through a predefined steps formed the bases of the data
recording, plotting and analyzing towards the final conclusion. Some designs
showed higher performance by about of (5-6%) than non- modified NACA
4412 for high approaching wind speed and (6-12%) for low approaching
wind speed.
The work is performed by using an up to date version of WORKBENCH