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J S Mathur

Bio: J S Mathur is an academic researcher from Council of Scientific and Industrial Research. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

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Journal ArticleDOI
TL;DR: In this article, the effect of frontal gust on the force patterns of an insect-sized flapping wing in the inclined-stroke plane was assessed using global recurrence plots and windowed recurrence quantification analysis (WRQA).
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 $$ \frac{{{\text{u}}_{\text{G}} }}{{{\text{u}}_{\text{w}} }} = \frac{{{\text{u}}_{\infty } }}{{{\text{u}}_{\text{w}} }} + \left( {\frac{{{\text{u}}_{\text{g}} }}{{{\text{u}}_{\text{w}} }}} \right)\sin \left( {2\uppi\frac{{{\text{f}}_{\text{g}} }}{{{\text{f}}_{\text{w}} }}{\text{t}}} \right) $$ 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.

3 citations


Cited by
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01 Jan 1954

4 citations

Journal ArticleDOI
TL;DR: In this article, a 2D inclined stroke plane kinematics of dragonflies was studied for various stroke plane angles using the Immersed Boundary (IB) solver, and the numerical results revealed the dominant lift enhancement mechanisms for this class of flows.

2 citations

Journal ArticleDOI
11 Mar 2021
TL;DR: In this article, the authors studied the entomopter performance under the influence of gust and provided the threshold of the frontal gusty conditions which would lead to the failure of the aircraft.
Abstract: Studies on entomopter’s performance under the influence of gust have received impetus in the past decade. There exists a dire need to ascertain the threshold of the frontal gusty conditions which w...