design_wind_speed_msnumberdefault: 285–80 (step 1)Design wind speed for structural assessment (m/s)
Wind pressure scales with the square of speed. Increasing from 28 to 40 m/s roughly doubles the structural load. Use national meteorological data or EN 1991-1-4 wind maps for your region.
wind_direction_degnumberdefault: 2700–360 (step 10)Prevailing wind direction for facade orientation analysis
The windward facade receives positive pressure (+0.8 Cp); the leeward facade receives suction (-0.5 Cp). Side facades experience intermediate suction. Direction determines which elevation is most critical.
terrain_categoryselectdefault: suburbanopen | suburban | urban | city-centreTerrain roughness category per EN 1991-1-4
Open terrain (coast, airfield) produces the highest pressures. City-centre terrain benefits from significant sheltering from surrounding buildings, reducing design loads by up to 50%.
return_period_yearsnumberdefault: 501–500 (step 1)Return period for extreme wind event
The standard structural design return period is 50 years. Use 500 years for critical infrastructure or post-disaster buildings. The difference is approximately a 15% increase in design speed.
Default settings represent a 50-year return period event in a suburban context. To explore design scenarios: - Set terrain category to 'open' for coastal or airport-adjacent sites - Increase return period to 500 years for critical facility assessment - Increase design wind speed to match regional wind zone values from your national annex - Inspect the results table and map to identify isolated tall buildings with elevated exposure multipliers