for edge screens later in this application any appropriate means to attach and secure the devices to wall surfaces are allowable if it does not significantly affect or alter the exterior shape of the device in a way that detriments the vortex suppressing function for example a set of cleats and fasteners 80 as illustrated in fig1 can be used for securing the apparatus fig2 shows an alternative configuration of a wall edge cap assembly 20 that functions in a similar fashion as that illustrated in fig1 multiple straight segments can also be used to approximate the curved exterior shape fig3 illustrates a preferred configuration of wall edge screen 30 in a cross sectional top view the perforated face protrudes outwardly from the wall corner 105 preferably along the axis of symmetry the wall edge screen employs a venting mechanism to suppress the vortex formation and vortex induced suction force the perforated face of a wall edge screen generally reduces the flow acceleration around the corner at the same time it facilitates pressure equalization across the screen face and around the wall corner 105 through a u201c bleeding u201d or venting effect which prevents vortex formation around and behind the outer edge of the windscreen it also breaks the flow around the corner down to small random and unorganized eddies and leads to dissipation of kinetic energy optional outer edge serration of the windscreen provides similar effects of flow breakdown and kinetic energy dissipation view 3 a form fig3 is shown in fig3 a to illustrate an example for face perforation and edge serration of a wall edge windscreen fig4 shows an alternative configuration of a wall edge windscreen assembly 40 the perforated faces form an approximately.