Every time the velocity factor (Ce) is higher than 1.5-2 the wind simulation will be very slow and eventually crash.
On this case (in the picture), our terrain category is 0, therefore our windprofile has been input like this, where the height of our building of 15 m corresponds to a Ce factor of 3.2. In this case the simulation will crash as well. According to the guidelines I found on this forum I think this is a fair method to fill in the velocity factor curve, but maybe I am doing something wrong. Do you have any suggestion?
