Abstract
This paper aims to study the wind flow characteristics and to analyze the wind pressure distribution on the surfaces around an irregular octagonal plan shape building model. There is a central open space in plan to provide more surface area around the building for natural ventilation. Plan area of the building is 300 m2(excluding the open space) and height is 50 m. Steady state flow of wind with 5% turbulence (moderate turbulence) under atmospheric boundary layer has been taken in the study. Numerical simulation with standard k-e model using ANSYS (CFX) software has been used for the purpose. Flow characteristics has been studied in terms of flow separation, reattachment of flow, creation of wakes and vortices. The surface pressure generated around the model has been studied in terms of coefficient of pressure. The model is symmetrical about both the axes in plan. Hence, study for different wind angle of attacks from 0° to 90° @ 30° interval has been conducted. The flow characteristics and unusual or critical coefficient of pressure on surfaces of the model observed have been discussed. Doi: 10.28991/cej-2021-03091760 Full Text: PDF
Highlights
Wind pressure is an important factor governing the natural ventilation, pedestrian comfort and design of tall buildings
For understanding the natural ventilation in buildings wind pressure is the primary characteristic whereas the force and moment it exerts on structure may be utilized for structural resistance and stability
ANSYS (CFX) is one of the numerical simulation tools that is used for analysing the wind pressure on tall buildings
Summary
Wind pressure is an important factor governing the natural ventilation, pedestrian comfort and design of tall buildings. Computational Fluid Dynamics (CFD) modelling is a convenient, economic and faster solution to access the wind pressure in tall buildings of various architectural shapes specially during the preliminary stage of finalization of any project. Wind response on tall buildings for structural variables like moments, loads, pressure etc. For understanding the natural ventilation in buildings wind pressure is the primary characteristic whereas the force and moment it exerts on structure may be utilized for structural resistance and stability. ANSYS (CFX) is one of the numerical simulation tools that is used for analysing the wind pressure on tall buildings. In ANSYS (CFX) complex geometry of buildings can be modelled and discretization of geometry into smaller elements for numerical analysis with good quality meshing can be achieved with full control. Changes in the geometry and meshing can be done for parametric studies
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