3D Numerical Studies on Variable Thrust Propulsion of Rhinoceros Beetle at Creeping Flow Conditions

摘要

The flow physics of insect's flapping is of topical interest due to varieties of industrial applications. This topic has been investigated from biological, biomechanical, morphological and fluid dynamics aspects by several investigators. One such problem of current interest to the aerodynamic industry is to examine various insects' inherent capabilities for the development of propulsive devices for humankind. Although many studies have been carried out on the aerodynamics of various Beetle wings there is no unique model available as on date for understanding the flow physics of small creatures at creeping flow conditions. In this paper, comprehensive aerodynamics of Rhinoceros Beetle at creeping flow condition is studied. The numerical analyses have been carried out with the help of a validated 3D pressure based SST k-ω turbulence model. The detailed analyses are carried out with the multiblock dynamic mesh for understanding the aerodynamic efficiency and the propulsive efficiency of the flapping wing at a flapping frequency of 40 Hz. Through our 3D analyses we have inferred that the lift is generated during the down stroke of Rhinoceros Beetle wing and the forward propulsive force is detected during its upstroke, which have been corroborated with the findings of Richard . Bomphrey et.al., (Nature, Vol. 544, 6 April 2017, pp. 92-95,) and in-Ho im and Chongam im (AIAA ournal, Vol. 49, No. 5, May 2011, pp. 953-968). The experience gained through this 3D analyses prompted us to conclude that for every beetle wing shape there is a particular flap angle to get the maximum lift and thrust during the upstroke and down stroke. We con ectured that the design and the operational parameters of flying vehicles are the key things for maintaining an efficient flying of any biologically inspired robotic vehicles. This study is a pointer towards for the design optimization of beetle wings for the various industrial applications wherein manoeuvres of robotic vehicles plays a ma or role in designing process.