Can a flow created by a fan show an Edge effect when hitting a wall?

[256bits]

given the streamline compression

The streamline figures in post 27 can be somewhat deceiving at first glance.

The streamline figure spacing is shown compressed, rather than equally spaced, at near y/D = 0 at location x/D = -2 at the left of the figure, with similar streamline compression with x/D increases. The streamlines are originally compressed likely to show better detail of formation of the 'bubble' at Rcr as the flow velocity increases.
The colored velocity change diagrams are the ones to look at to show the velocity distribution over different edges of the object.

Anyways, the flow is laminar in the study, with low RE, ( inertial << frictional ( viscous ) ) . The curvature of the edge is apparently affecting the velocity flow distribution.

"Flow accelerates as the streamlines compress over the roof and decelerates as they spread downward over the wake on the downwind side of the building."

"For an isolated high-rise building...high wind speed at pedestrian level can be caused by.... the corner streams."

I interpret both of these to be saying higher than freestream.

For a building, depending upon the wind velocity, Re can be anything from to Re 10⁶ for a windy day. Inertial forces dominate at higher Re. At some Re, the wind inertia will cause it to separate from the building surface ( flat roof or sides ) and overshoot upwards as seen in the ASHRAE picture. Re characteristic length would be something involving wetted surface of the H,D, and W of the building, with every building design being different.

I interpret both of these to be saying higher than freestream.
As do I, with a caveat below.
Studies have shown that the amplification can be greater than 1, extreme case up to 1.2, mostly less than that.
Question is "What freestream velocity is, or should be, based upon - the U_T at the undisturbed region, the U_max above the ABL, the U_r at the roof height, or some other U_e, where e is some factor to determine the horizontal, or vertical, distance from the building face based upon building W and H, where the flow velocity has not yet been disturbed by the building as seen in the velocity diagrams in post 27.
U_T nor U_max do not seem to be all that relevant, so we are left with the free stream velocity at building height, or some calculated velocity.

From the original post 1

TL;DR: I want to know whether a flow created by a simple fan will show Edge Effect when hitting a flat and vertical surface.

when an airflow hits the walls of buildings and its velocity will increase. Some market available shroud augmented wind turbine types are claiming that they used this effect to increase the output of their own designed wind turbine

Within the Atmospheric Boundary Layer, the velocity flow distribution will not be so neat as the ASHRAE suggests. There will be a velocity frequency distribution around the mean. We can call a measure of this frequency distribution as the wind's 'gustiness'. And everyone knows that wind gustiness is a bane of most wind turbine designs.
Reason windmills are tall and away from hill, trees, and buildings --> get as high as possible away from ABL effects --> less gustiness and higher wind velocity.[/SUB]

 

[FactChecker]

Decreased pressure means fall in temperature and that means energy is released. That energy is being converted into the kinetic energy.

There are other things going on. Please try to understand Bernoulli's equation, which gives the trade-off between pressure and velocity.

 

[russ_watters]

The equation simply says that as the velocity increases, the pressure decreases. And the decrease in pressure is proportional to the square of the increase in velocity (the gz part can be neglected).

Right. And these are forms of energy: kinetic energy increases, pressure energy decreases. That's the energy that gets traded from one form to another.

Decreased pressure means fall in temperature and that means energy is released. That energy is being converted into the kinetic energy.

That isn't in the equation, is it?