AHMAD, Mughees (The Hong Kong Polytechnic University), Li, Boyang (The Hong Kong Polytechnic University)

A Comparative Analysis of Turbulence Models in FLUENT for High-Lift Airfoils at Low Reynolds Number

Scheduled for presentation during the Regular Session "Simulation" (ThB2), Thursday, June 23, 2022, 15:30−15:50, Bokar

2022 International Conference on Unmanned Aircraft Systems (ICUAS), June 21-24, 2022, Dubrovnik, Croatia

This information is tentative and subject to change. Compiled on April 24, 2024

Abstract

At a low Reynolds number, the aerodynamic properties of an airfoil are highly influenced by the viscous shear flow near the wall-bounded region. The flow undergoes a transition from laminar to turbulent forming a laminar separation bubble (LSB). Therefore, to accurately simulate the viscous flows, shear stresses in the boundary layer need to be carefully evaluated. The aim of this research is to identify a turbulence model which can accurately compute aerodynamic force coefficients for high-lift airfoils using the Finite Volume Method in a commercially available software - Ansys FLUENT. We analyzed three different turbulence models: Spalart Allmaras (SA), SST k-ω(γ), and k-kL-ω at a low chord-based Reynolds number for two high-lift airfoils, E423 and S1223. The computation results are compared with results generated by XFoil, which solves viscous flows using the panel method and boundary layer theory, and experimental data. The results show that the SST k-ω(γ) model generates at least 8.6% better results in predicting the coefficient of drag as compared to other turbulence models, and SA model outperforms SST k-ω(γ) in predicting lift coefficient taking into account the computational cost.