I cannot guess what is that "0" for software, however I have the remark that under API 650 requirements you cannot consider wind of zero velocity. It is true that it is not forbidden, but technically you cannot say you considered zero velocity as 3-sec gust design wind speed.
Please see API 650, 5.2.1 Loads, point K
Wind (W): The design wind speed (V) shall be 190 km/hr (120 mph), the 3-sec gust design wind speed determined from ASCE 7, Figure 6-1, or the 3-sec gust design wind speed specified by the Purchaser (this specified wind speed shall be for a 3-sec gust based on a 2% annual probability of being exceeded [50-year mean recurrence interval]).
Best regards.