Newsletter  2020.3  Index

Theme : "The Conference of Fluid Engineering Division (March issue)” Preface (T. HASHIMOTO，S. MATSUDA，H.J. PARK) Wind Tunnel Tests for Research and Development of Trains Atsushi IDO (Railway Technical Research Institute) Drag Reduction Effect of Turbulent Pipe Flow with Traveling Wavy Elastic Wall Seiya NAKAZAWA, Takaaki SHIMURA, Akihiko MITSUISHI, Kaoru IWAMOTO and Akira MURATA (Tokyo University of Agriculture and Technology) Growth Process of Vorticity Formed on a Moving Elastic Airfoil Chigusa TONE, Masaki FUCHIWAKI (Kyushu Institute of Technology) Study of identification of large-scale turbulence structures in drag-reducing turbulent boundary layer flow by  means of stereoscopic PIV measurements Makoto HIRANO, Shinji TAMANO, Toru YAMADA and Youhei MORINISHI (Nagoya Institute of Technology) NEW drink Kengo HAMADA (Meisei University)

 

Growth Process of Vorticity Formed on a Moving Elastic Airfoil

Chigusa TONE Masaki FUCHIWAKI Kyushu Institute of Technology

Abstract

The flow field around moving airfoil capable of flexible elastic deformation has become a focus of attention in recent years. These flow fields may be understood as a fluid-structure interaction (FSI) problem, and the motion and deformation of elastic airfoils, as well as the associated vortex flow phenomena in their vicinity, are complicated. Many studies on the flow filed around the elastic moving body have also carried out. The macro scale vortex structure and the dynamic forces acting on the elastic moving airfoil have been understood. However, the growth process of the vorticity in a vicinity of the wall of an elastic airfoil has not been clarified sufficiently. In this study, the authors investigate the growth process of the vorticity in a vicinity of the wall of an elastic airfoil by FSI simulation using ANSYS 17.0 / ANSYS CFX 17.0. Especially, the authors focus on the relationship between the spatial gradient of the wall of the elastic airfoils and the growth process of the vorticity in a vicinity of the wall.

Key words

Vortex, Airfoil, Fluid-Structure-Interaction

Figures

(a) Structure region	(b) Around the airfoil of fluid region
Fig. 1 Numerical mesh of structure and fluid region

Fig. 2 Spatial gradient of wall of a moving elastic airfoil

(a) NACA0010	(b) NACA0020	(c) Flat plate
Fig. 3 Temporal change of spatial gradient of the wall in elastic part

(a) Deforming almost linearly	(b) Deforming only trailing edge	(c) Deforming of trailing edge constantly
Fig. 4 Three kinds of elastic deformation of the elastic part

(a) t/T = 0.65

(b) t/T = 0.75

(c) t/T = 0.85
Fig. 5 Vorticity contour in vicinity of wall of three kinds of airfoils, NACA0010，NACA0020 and flat plate

(a) NACA0010	(b) NACA0020	(c) Flat plate
Fig. 6 Non-dimensional vorticities in the vicinity of the wall of three kinds of airfoils, NACA0010, NACA0020 and flat plate

(a) Deforming almost linearly	(b) Deforming only trailing edge	(c) Deforming of trailing edge constantly
Fig. 7 Pattern diagrams of growth of vorticities on the wall of three kinds of elastic deformation

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Last Update：3.17.2020