SPALART-ALLMARAS TURBULENCE MODEL VALIDATION FOR AIR FLOW AROUND SKYSCRAPER MODEL

Ibrahim A. M. Gad

Abstract


This work presents an experimental-numerical investigation of the flow around tall building
model. Measured data of static surface pressure are compared with the numerical results. The main
objective of the comparison was to obtain information on how well the numerical simulations using
standard turbulence models, were able to reproduce the experimental data. The numerical
predictions for pressure distribution on the building are performed by solving the Reynoldsaveraged
Navier–Stokes (RANS) equations using both the Spalart-Allmaras (SA) and standard k-
(SKE) turbulence models constructed in FLUENT CFD code. It is known from literature that LES
models are more suitable to simulate the behavior of bluff body in a crossed flow with better
accuracy but from an engineering point of view they are high demanding in terms of time and CPU
performances. This paper is to test the faster set of SA and SKE turbulence models and to judge
their accuracy by using experimental data for validation. The results show that SA model
reproduces the experimental data better than SKE. Generally SA model shows reasonable
agreement with the corresponding wind tunnel pressure coefficients in different wind directions

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