Assessment of Local Pressure Coefficient
Over Conventional and Unconventional
Tall Buildings
K. B. Rajasekarababu and G. Vinayagamurthy
Abstract This article provides an overview of local pressure coefficients (Cp) on
conventional and unconventional tall buildings with the application of CFD. Various
modifications in architectural shapes on tall buildings eventually lead to a reduction
in the wind load on building surfaces. The surface pressure on conventional (Square
and rectangular) buildings is relatively different in comparison to unconventional tall
buildings. This study is to assess the surface pressure coefficient over rectangular,
taper and setback buildings. The assessed results show that the taper building has
7% Cp rise at ground level (y/H = 0.225) in the windward face, and 34% Cp fall at
the middle level (y/H = 0.475) in the side face when compared with the rectangular
building. Whereas for the setback building, Cp at ground level near setback (y/H =
0.225) has reduced to about 25% and about 6% at the middle level (y/H = 0.475)
in windward than that in the rectangle building. Also, the side faces of the setback
showed a 15% drop in Cp than other buildings. In leeward face, Cp is reduced to
56% near setback at the top of the building (y/H = 0.725). This assessment of the Cp
on these buildings shows that the effect of setbacks on building reduces the pressure
variation on all faces and the downstream wake vortices.
Keywords Setback · Taper building · Rectangular building · Local pressure
coefficients · Tall buildings · CFD · IDDES · Iso-surface
K. B. Rajasekarababu · G. Vinayagamurthy (B)
Aerodynamics Laboratory, School of Mechanical Engineering, Vellore Institute of Technology
(Chennai Campus), Chennai 600127, India
e-mail: vinayagamurthy.g@vit.ac.in
K. B. Rajasekarababu
e-mail: kb.rajasekarababu2014@vit.ac.in
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Singapore Pte Ltd. 2021
N. Gascoin and E. Balasubramanian (eds.), Innovative Design, Analysis
and Development Practices in Aerospace and Automotive Engineering, Lecture Notes
in Mechanical Engineering, https://doi.org/10.1007/978-981-15-6619-6_35
325
Over Conventional and Unconventional
Tall Buildings
K. B. Rajasekarababu and G. Vinayagamurthy
Abstract This article provides an overview of local pressure coefficients (Cp) on
conventional and unconventional tall buildings with the application of CFD. Various
modifications in architectural shapes on tall buildings eventually lead to a reduction
in the wind load on building surfaces. The surface pressure on conventional (Square
and rectangular) buildings is relatively different in comparison to unconventional tall
buildings. This study is to assess the surface pressure coefficient over rectangular,
taper and setback buildings. The assessed results show that the taper building has
7% Cp rise at ground level (y/H = 0.225) in the windward face, and 34% Cp fall at
the middle level (y/H = 0.475) in the side face when compared with the rectangular
building. Whereas for the setback building, Cp at ground level near setback (y/H =
0.225) has reduced to about 25% and about 6% at the middle level (y/H = 0.475)
in windward than that in the rectangle building. Also, the side faces of the setback
showed a 15% drop in Cp than other buildings. In leeward face, Cp is reduced to
56% near setback at the top of the building (y/H = 0.725). This assessment of the Cp
on these buildings shows that the effect of setbacks on building reduces the pressure
variation on all faces and the downstream wake vortices.
Keywords Setback · Taper building · Rectangular building · Local pressure
coefficients · Tall buildings · CFD · IDDES · Iso-surface
K. B. Rajasekarababu · G. Vinayagamurthy (B)
Aerodynamics Laboratory, School of Mechanical Engineering, Vellore Institute of Technology
(Chennai Campus), Chennai 600127, India
e-mail: vinayagamurthy.g@vit.ac.in
K. B. Rajasekarababu
e-mail: kb.rajasekarababu2014@vit.ac.in
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Singapore Pte Ltd. 2021
N. Gascoin and E. Balasubramanian (eds.), Innovative Design, Analysis
and Development Practices in Aerospace and Automotive Engineering, Lecture Notes
in Mechanical Engineering, https://doi.org/10.1007/978-981-15-6619-6_35
325