I am pretty new to Butterfly and I am looking at the outdoor airflow at ground level around a height of 1.1 meters. I was originally planning on using the Butterfly example file of outdoor airflow in 2d as the calculation time is significantly shorter than the 3d example. However, when comparing both of them, with the same legend parameters and same windspeed input for the wind tunnel, the results in 2d have blue arrows and lower windspeed around the edges of the left building while the 3d one has different results as you can see in the illustration.
My interpretation of this is that the 2d file is not considering the vertical variable of the wind leading to smaller wind vectors when the wind is directed more vertically. So if I am looking at the ariflow in a park or between these two boxes I need to look at the 3d one which is more reliable, am I right on this ?