Affiliations 

  • 1 Universiti Teknologi MARA
  • 2 Kyushu University
ESTEEM Academic Journal, 2021;17(2):67-77.
MyJurnal

Abstract

Building overhang is an essential element in the construction of terrace
houses in Malaysia to protect occupants from the sunlight, car parking, and
social event purposes. However, there is still a lack of study investigating the
effect of overhang in a windy area of terrace houses despite its effect on the
flow modification around the building. Therefore, in this paper, a series of
computational fluid dynamics (CFD) simulations were performed using
Reynolds Average Navier Stokes(RANS) equations and renormalization
group (RNG) k – ε as the turbulence closure model. Simulations were
conducted on a unity aspect ratio of two-dimensional street canyon
representing the low-rise terrace house area in a flat roof shape and three
different overhang conditions. The protruding overhangs were significantly
modified the in-canyon flow structure as it limited the penetration of the
above flow into the canyon as compared to the without overhang case. In
addition, spatially-averaged ? of the turbulent kinetic energy depicted that
the value decreased within the canyon, demonstrating the independence of
the overhang location. It is recommended to perform a further study on the
ventilation performance of the street canyon through evaluation of
ventilation indices such as ventilation rate, air exchange rate (ACH), and
pollutant exchange rate (PCH).