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Simulation of dynamic stall using direct-forcing immersed boundary method at low Reynolds number

Nima Vaziri (Department of Physics, Karaj Branch, Islamic Azad University, Karaj, Iran)
Ming-Jyh Chern (Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan)
Tzyy-Leng Horng (Department of Applied Mathematics, Feng Chia University, Taichung, Taiwan)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 2 August 2018

Issue publication date: 12 September 2018

159

Abstract

Purpose

The purpose of this study is simulation of dynamic stall behavior around the Eppler 387 airfoil in the low Reynolds number flow with a direct-forcing immersed boundary (DFIB) numerical model.

Design/methodology/approach

A ray-casting method is used to define the airfoil geometry. The governing continuity and Navier–Stokes momentum equations and boundary conditions are solved using the DFIB method.

Findings

The purposed method is validated against numerical results from alternative schemes and experimental data on static and oscillating airfoil. A base flow regime and different vortices patterns are observed, in accordance with other previously published investigations. Also, the effects of the reduced frequency, the pitch oscillation amplitude and the Reynolds number are studied. The results show that the reduced frequency has a major effect on the flow field and the force coefficients of the airfoil. On the other hand, the Reynolds number of the flow has a little effect on the dynamic stall characteristics of the airfoil at least in the laminar range.

Practical implications

It is demonstrated that the DFIB model provides an accurate representation of dynamic stall phenomenon.

Originality/value

The results show that the dynamic stall behavior around the Eppler 387 is different than the general dynamic stall behavior understanding in the shedding phase.

Keywords

Citation

Vaziri, N., Chern, M.-J. and Horng, T.-L. (2018), "Simulation of dynamic stall using direct-forcing immersed boundary method at low Reynolds number", Aircraft Engineering and Aerospace Technology, Vol. 90 No. 5, pp. 869-876. https://doi.org/10.1108/AEAT-05-2017-0128

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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