In the stand alone version of Flow Design, the flow direction is fixed. Air enters through the Front face and exits through the Back face. To change the direction of the flow relative to the model, you can use the Model Orientation tool to reorient the model about the X, Y, and Z axes.
Use the X Angle slider to rotate the model about the axis extending between the Front and Back faces of the wind tunnel:
Use the Y angle slider to rotate the model about the axis between the Right and Left faces of the tunnel:
Use the Z angle to rotate the model about the axis between the Top and Bottom faces of the tunnel:
To update the orientation as you move the sliders, enable Dynamic update.