Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

De, Manabendra M and Mathur, JS and Vengadesan, S (2019) Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions. Sadhana - Academy Proceedings in Engineering Sciences, 44 (3). pp. 1-17. ISSN 02562499

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Abstract

Global recurrence plots (GRPs) and windowed recurrence quantification analysis (WRQA) are two recurrence paradigms which find wide applications to detect the onset of instability in a dynamic system. The present work reports the attempt to employ these recurrence paradigms to assess the effect of frontal gust on the force patterns of an insect-sized flapping wing in the inclined-stroke plane. Horizontal and vertical forces generated by the flapping wing in the presence of gusts of the form uGuw=u∞uw+(uguw)sin(2πfgfwt) were numerically estimated in the 2D reference frame for Re = 150. Nine gusts with combinations of the ratio of gust frequency to wing’s flapping frequency, fg/fw = 0.1, 0.5 and 1 and ratio of gust velocity amplitude to root mean square averaged flapping velocity, ug/uw = 0.1, 0.5 and 1 were considered. Recurrence studies of the forces were carried out to find out the gusty condition, which would trigger an onset of unstable behaviour. Studies indicated a possible onset of instability in the force patterns for gust with fg/fw = 0.1 and ug/uw = 1. The onset of unstable behaviour was prominently captured by WRQA of the vertical force coefficient based on determinism (DET) and laminarity (LAM) series

Item Type: Article
Uncontrolled Keywords: Insect-sized flapping wing; inclined-stroke plane; frontal gust; global recurrence plots; windowed recurrence quantification analysis
Subjects: ENGINEERING > Engineering (General)
ENGINEERING > Fluid Mechanics and Thermodynamics
ENGINEERING > Mechanical Engineering
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 12 May 2022 10:13
Last Modified: 12 May 2022 10:13
URI: http://nal-ir.nal.res.in/id/eprint/13529

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