Computational fluid dynamics analysis of the wind drag force in a typical Mexican screenhouse

J. Flores-Velazquez, A. Arzeta, W. Ojeda, F. Villarreal-Guerrero
In a curve with abrupt changes of direction, such as a greenhouse or a screenhouse roof surface, a phenomenon of separation of the boundary layer, which favors the formation of vortices and causes complex turbulence, may occur. Originally, this phenomenon was analyzed in either water or wind tunnels, by constructing each of the structures to be simulated at scale. However, when the wall is a porous surface, it is very difficult to build a scale model. An alternative for solving such a problem is through numerical methods. The aim of this study was to conduct a numerical analysis of the resistance or drag force a moving fluid exerts on a screenhouse. Two types of pressures are produced, one depending largely on the shape and surface friction and another due to tangential stress on the border. This type of analysis has been conducted mainly in greenhouses to evaluate the efficiency of the ventilation system for climate conditioning; however, for screenhouses, analyses of this kind have been limited. The screenhouse is the most important production system in protected environments. This research evaluates the effect of the size and shape of the screenhouse on the efficiency of the natural ventilation system by computational fluid dynamics.
Flores-Velazquez, J., Arzeta, A., Ojeda, W. and Villarreal-Guerrero, F. (2018). Computational fluid dynamics analysis of the wind drag force in a typical Mexican screenhouse. Acta Hortic. 1227, 99-106
DOI: 10.17660/ActaHortic.2018.1227.12
turbulence model, drag coefficient, horticulture, ventilation, screenhouse

Acta Horticulturae