A STUDY OF THE EFFECT OF ELEMENT TYPES ON FLOW AND TURBULENCE CHARACTERISTICS AROUND AN ISOLATED HIGH-RISE BUILDING

M Zahid, Iqbal, Als Chan
2015 Eleventh International Conference on CFD in the Minerals and Process Industries CSIRO   unpublished
Grid generation is a crucial and time-intensive numerical simulation process in which element type and mesh density play a major role. The accuracy and high computational cost of numerical simulations remain an academic and industrial challenge. This study quantitatively assessed the effect of an element type on the flow and turbulence characteristics around an isolated high-rise building through a Reynolds-averaged Navier-Stokes turbulence model. Hexahedral and tetrahedral elements are
more » ... used in computational fluid dynamics (CFD) simulations; however, polyhedral elements are rarely used. Hexahedral, polyhedral, and tetrahedral elements were compared, and in each case, coarse, medium, and fine mesh resolutions were investigated. The effects of an element type on the mean flow and turbulent kinetic energy around an isolated high-rise building were discussed. Furthermore, the results were compared against the wind tunnel experimental data reported in relevant literature. The results showed that polyhedral elements performed more favourably than tetrahedral elements. However, the results of hexahedral element were closer to those of the experiment. In addition, a mean absolute error (MAE) was calculated, and the results showed that polyhedral elements required less computational time than tetrahedral elements did. Using polyhedral elements in CFD was found to be more effective than using tetrahedral elements.
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