Wind Flow Over Roof

Wind is one of the significant forces of nature that must be considered in the design of buildings.

Wind flow over roof.

It is at these locations that wind uplift damage initiates especially with asphalt shingles that are not well bonded fig. Two dimensional wind flow over a building after jensen. Wind flow in these areas is quite turbulent. Flow visualization measurements of velocity and surface pressure around the models placed in wind tunnel were made.

Wind flow over the low rise building models with gabled roofs having different pitch angles. The calculations also provide guidance for undertaking wind. However uplift pressures are not uniform and are highest along the windward corners rakes eaves and ridges fig. Separation at eave causing high suction after jensen.

Air flow over a building creates a positive pressure zone on the upstream side and negative pressure zones cavities or eddy zones on the roof and all other sides as illustrated in fig. Thus it is important that the roof. When a strong wind kicks up the pressure outside drops but there isn t time for air to flow in and out of the house to cause the corresponding drop in the interior pressure. All sorts of turbulent effects occur especially at building corners edges roof eaves.

With air flow perpendicular to the wind ward wall. The actual behavior of wind is influenced not only by the surface or boundary layer conditions but also by the geometry of the building. It is shown that trees can have a significant effect on the mean wind speed and turbulence over the roof and should be included when performing a computational fluid dynamics simulation. Similar to the effect on airplane wings wind flow under a roof pushes upward while wind flow over a roof pulls upward figure 1.

At a critical slope angle maximum suctions occur. How wind forces affect homes. That s why you get a pressure gradient across the roof. Uplift occurs as wind flows over a roof.

3d solutions of the flow fields were obtained with two different. The effect of the local suburban topology on the wind speed and turbulence intensity fields in a given locality is therefore an important determinant of the optimal location of micro wind turbines. The wind flow field above the roof of buildings in this environment is different to that over flat terrain or around isolated buildings. A computational study was performed to investigate the effect of varying upwind tree heights on the wind flow over a 15 m high flat roof building.