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Wind and Structures
  Volume 4, Number 3, June 2001, pages 227-246

A model of roof-top surface pressures produced by conical vortices: Model development
D. Banks and R.N. Meroney(U.S.A.)

    The objective of this study is to understand the flow above the front edge of low-risernbuilding roofs. The greatest suction on the building is known to occur at this location as a result of thernformation of conical vortices in the separated flow zone. It is expected that the relationship between thisrnsuction and upstream flow conditions can be better understood through the analysis of the vortex flowrnmechanism. Experimental measurements were used, along with predictions from numerical simulations ofrndelta wing vortex flows, to develop a model of the pressure field within and beneath the conical vortex.rnThe model accounts for the change in vortex suction with wind angle, and includes a parameter indicatingrnthe strength of the vortex. The model can be applied to both mean and time dependent surface pressures,rnand is validated in a companion paper.
Key Words
    wind; vortex; load; pressure; roof; low-rise; building; flow separation.
D. Banks and R. N. Meroney, Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University(CSU), Fort Collins, CO 80523, U.S.A.

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