Evaluation of wind pressure acting on multi-span greenhouses using CFD technique, Part 2: Application of the CFD model

Revision of greenhouse design standards is required to ensure the structural safety of greenhouses in strong wind environments. The wind pressure coefficients (Cp) of various greenhouses must be evaluated to revise the newly modified greenhouse design standards. In this study, the Cp values of multi-span greenhouses that are typical in South Korea, e.g., wide-span, Venlo, and 1-2W type greenhouses, were estimated using the developed computational fluid dynamics (CFD) model from the first paper. In particular, the CFD-computed Cp values were analysed with consideration of the wind directions, number of spans, and greenhouse design factors, such as the roof slope and roof curvature radius. Based on the analysed results, the CFD-computed Cp values of multi-span greenhouses were suggested for use in structural and cladding designs based on the defined sections of the greenhouse surface, various wind directions, number of spans and design factors. The Cp values for structural design were analysed for wind blowing in the direction perpendicular to the ridge (0°) and in the direction of the ridge (90°). In addition, the maximum Cp values were examined for cladding design with consideration of every wind direction.

[1]  A. Mistriotis,et al.  Airflow through net covered tunnel structures at high wind speeds , 2012 .

[2]  D. Wilcox.  Reassessment of the scale-determining equation for advanced turbulence models , 1988 .

[3]  In-Bok Lee,et al.  Study on Forced Ventilation System of a Piglet House , 2004 .

[4]  Bassam A. Younis,et al.  Geometric parameters that affect wind loads on low-rise buildings: full-scale and CFD experiments , 1993 .

[5]  Antonios Mistriotis,et al.  Numerical estimation of the internal and external aerodynamic coefficients of a tunnel greenhouse structure with openings , 2002 .

[6]  A. P. Robertson,et al.  Wind pressures on permeably and impermeably-clad structures , 2002 .

[7]  Da-Wen Sun,et al.  Applications of computational fluid dynamics (CFD) in the modelling and design of ventilation systems in the agricultural industry: a review. , 2007, Bioresource technology.

[8]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[9]  Edward Henry Mathews,et al.  Computation of wind loads on a semicircular greenhouse , 1988 .

[10]  Josua P. Meyer,et al.  Numerical prediction of wind loads on buildings , 1988 .

[11]  In-Bok Lee,et al.  Evaluation of wind pressure acting on multi-span greenhouses using CFD technique, Part 1: Development of the CFD model , 2017 .

[12]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[13]  James R. McDonald,et al.  Roof corner pressures measured in the field on a low building , 1992 .

[14]  G. M. Richardson.  Full-Scale Wind Load Measurements on a Single-span Film Plastic-Clad Livestock Building , 1993 .

[15]  G.P.A. Bot,et al.  Computational Fluid Dynamics (CFD) as a tool for the analysis of ventilation and indoor microclimate in agricultural buildings , 1997 .

[16]  T. W. Davies,et al.  Computational fluid dynamics simulations and validation of the pressure distribution on the roof of a commercial multi-span Venlo-type glasshouse , 2002 .

[17]  R. P. Hoxey,et al.  Wind loads on film plastic greenhouses , 1983 .

[18]  Edward Henry Mathews,et al.  Numerical Modelling of Wind Loading on a Film Clad Greenhouse , 1987 .

[19]  Eric Savory,et al.  Surface pressures and wake flows associated with highly curved agricultural buildings. , 1990 .

[20]  R. P. Hoxey,et al.  Measurements of wind loads on full-scale film plastic clad greenhouses , 1984 .

[21]  R. P. Hoxey,et al.  Measurements of wind loads on full-scale glasshouses , 1980 .

[22]  P. Richards,et al.  Appropriate boundary conditions for computational wind engineering models using the k-ε turbulence model , 1993 .

[23]  P. Richards,et al.  Wind-tunnel modelling of the Silsoe Cube , 2007 .

[24]  Peter Richards,et al.  Pressures on a cubic building—Part 1: Full-scale results , 2012 .

[25]  T. H. Short,et al.  TWO-DIMENSIONAL NUMERICAL SIMULATION OF NATURAL VENTILATION IN A MULTI-SPAN GREENHOUSE , 2000 .

[26]  Tomoharu Yamaguchi,et al.  Wind Tunnel Study of the Interaction of Two or Three Side-by-Side Pipe-Framed Greenhouses on Wind Pressure Coefficients , 2010 .

[27]  In-Bok Lee,et al.  Evaluation of wind pressure coefficients of single-span greenhouses built on reclaimed coastal land using a large-sized wind tunnel. , 2016 .