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A hydrodynamic method for calculating the wind Load on the leeward slope of a roof and for reducing the pressure jump

O.N. Melnikova , K.V. Pokazeev

Moscow University Physics Bulletin 2015. 15. N 5. P. 423

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Annotation

A hydrodynamic model for calculating the pressure jump on the leeward slope of a roof during a horizontal air flow that is directed to its slope is proposed for the first time. The model takes the formation of vortices in a viscous layer of an air flow that decelerates in the flow direction into account. When a vortex departs from the viscous layer, flow acceleration occurs at the underlying surface, leading to a considerable pressure drop and to tearing the roof off. It is shown that the negative pressure jump at a site that is adjacent to the roof ridge can be decelerated by several percent with a decreased friction factor and an increased length of the portion of the roof where air flows without separation. A method for considerably reducing the pressure drop is proposed for the first time, viz., the installation of expanding air ducts on the roof, within which a compensatory pressure jump occurs. The results are verified by laboratory studies.

Received: 2015 March 17
Approved: 2015 September 14
PACS:
40.00.00 ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
47.20.Ib Instability of boundary layers; separation
47.27.N- Wall-bounded shear flow turbulence
Rissian citation:
О.Н. Мельникова, К.В. Показеев.
Гидродинамический метод расчета ветровой нагрузки на подветренный склон крыши и способ снижения скачка давления.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 2015. № 5. С. 94.
Authors
O.N. Melnikova, K.V. Pokazeev
Department of Physics, Moscow State University, Moscow, 119991 Russia
Issue 5, 2015

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