I've simulated a case where the wind flow goes through a window opening with certain geometry details. I need to know the mean values of velocity components of the wind exactly after the window plane to use this information in another case where I'm planning to simulate the whole building without the window's geometry details, in order to set the grid mesh easily.

Is there any type of object made especially for the visualization of these kind of results?

Thanks in advance.

If you plot contours in the plane across or just beyond the window, then reduce the plot limits so that the coverage is of the same area and space as the window, the average value will be shown just under the probe value at the top RHS of the screen.