Numerical investigation of turbulence models with emphasis on turbulent intensity at low Reynolds number flows

Bashir, Musavir and Parvathy, Rajendran and Khan, Ambareen and Vijayanandh, Raja and Khan, Sher Afghan (2023) Numerical investigation of turbulence models with emphasis on turbulent intensity at low Reynolds number flows. Advances in Aircraft and Spacecraft Science, 10 (4). pp. 1-13. ISSN 2287-528X E-ISSN 2287-5271

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Abstract

The primary goal of this research is to investigate flow separation phenomena using various turbulence models. Also investigated are the effects of free-stream turbulence intensity on the flow over a NACA 0018 airfoil. The flow field around a NACA 0018 airfoil has been numerically simulated using RANS at Reynolds numbers ranging from 100,000 to 200,000 and angles of attack (AoA) ranging from 0° to 18° with various inflow conditions. A parametric study is conducted over a range of chord Reynolds numbers for free-stream turbulence intensities from 0.1 % to 0.5 % to understand the effects of each parameter on the suction side laminar separation bubble. The results showed that increasing the free-stream turbulence intensity reduces the length of the separation bubble formed over the suction side of the airfoil, as well as the flow prediction accuracy of each model. These models were used to compare the modeling accuracy and processing time improvements. The K- SST performs well in this simulation for estimating lift coefficients, with only small deviations at larger angles of attack. However, a stall was not predicted by the transition k-kl-omega. When predicting the location of flow reattachment over the airfoil, the transition k-kl-omega model also made some over-predictions. The Cp plots showed that the model generated results more in line with the experimental findings.

Item Type:	Article (Journal)
Uncontrolled Keywords:	CFD simulation; NACA0018 airfoil; Reynolds number; turbulence model; turbulent intensity
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL780 Rockets
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	25 Sep 2023 12:13
Last Modified:	31 Dec 2023 14:04
URI:	http://irep.iium.edu.my/id/eprint/106075

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