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Numerical Parametric Study of Wind-Driven Rain and Overhang Effectiveness on a Mid-Rise Building

Title:

Numerical Parametric Study of Wind-Driven Rain and Overhang Effectiveness on a Mid-Rise Building

Khalilzadeh, Ali (2017) Numerical Parametric Study of Wind-Driven Rain and Overhang Effectiveness on a Mid-Rise Building. Masters thesis, Concordia University.

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Abstract

The question of how wind and wind-accompanied rain are properly predicted, regardless of the method, whether experimental, semi-empirical or numerical is to this day unsettled. Moreover, parametric study of the Wind-Driven Rain (WDR), and consequently its wetting building façades is rather insufficiently dealt with. Due to the destructive repercussions of moisture penetration induced by WDR, façade protection in form of an overhang, which is considered as the most effective means to address the issue with, in regions with high levels of liquid precipitation, is the necessity of this study. Suitable numerical solution, alongside delving into the effect of numerous parameters governing the natural phenomenon, including wind direction and speed, rainfall intensity, and overhang size and shape, is the target of this work. To reach this goal, a MATLAB code controls raindrop injection into pre-solved domain of external flow on stand-alone and surrounded building. Wind flow solution of multiple turbulence schemes is bestowed upon ANSYS Fluent software package. Drag simulation and inlet velocity profiles, are hooked to the solver using User-Defined Functions (UDFs). Validation of wind simulation is done by comparing the predictions to wind-tunnel measurements. Validation of rain simulation on the other hand is performed by comparing the results to real-life conditions on a medium-rise building. Results of validation are rather promising for the upper-half of the windward façade. Proper technique of simulation of wind with conventional two-equation turbulence models, alongside the inlet velocity profiles is found to be boundary-treated Standard k-, wind log-law. Overhang presence and its shape and size are vastly studied and parametrized to find the effect of those parameters on the effectiveness of the overhang. This study shows that although rainfall intensity is faintly influential, the wind speed and direction, alongside overhang size and shape, considerably influence catch ratio and effectiveness of the overhang. The effectiveness decreases by an increase in wind speed and increases for oblique winds. Façade effectiveness of the overhang decreases with an increase in rainfall intensity; although this parameter’s influence on point effectiveness is dependent upon the location of point on the façade. Finally, the wider the overhang, the more effective it is in protecting the façade, as a whole, from rain.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Thesis (Masters)
Authors:Khalilzadeh, Ali
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Mechanical Engineering
Date:August 2017
Thesis Supervisor(s):Ng, Hoi D. and Ge, Hua
Keywords:Wind, Wind-Driven Rain, Overhang, Two-Equation Turbulence Model, Parametric Study, Modeling Validation, Atmospheric Boundary Layer Flow, Mid-Rise Building, Suburban Terrain, Surrounded Building
ID Code:983112
Deposited By: ALI KHALILZADEH
Deposited On:10 Nov 2017 21:28
Last Modified:18 Jan 2018 17:56

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