Rotary Motion

The simulation was for linear motion, but for the idea described here and here, the airfoils are in rotary motion so that the speed of the airfoil at any point depends on the radius of that point.  If we consider two points A and B on the airfoil, one at a radius of 1 and another at radius 5, for example,  the speed at point B will be 5x the speed at point A.  The air pressure above the airfoil at point A will be much greater than the air pressure above the airfoil at point B and will create airflow in the radial direction from point A to point B on one side and from point B to point A on the other side which is probably problematic. 

In order to reduce the effect of radial air motion, fins can be attached to the airfoils as illustrated below.  These are similar to the fins (winglets) attached to many commercial airplane wings at their tip to prevent airflow from below the wing tip to above the wing tip due to the pressure difference below the wing and above the wing.