Experimental Investigation on Laminar Separation Bubble Over an Airfoil � a Review

Somashekar, V; Raj, A. Immanuel Selwyn

doi:10.17485/ijst/2018/v11i11/119288

Cited by 4 publications

(1 citation statement)

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“…Thus, the size of the bubble has significant impact on the aerodynamic performance. Various experimental studies are done to understand the formation and characteristics of LSB was reviewed by Somashekar (8) and Park (9) and therefore are not repeated here. Instead, the current understanding of the characteristics of LSB and the studies validating the capability of RANS based turbulence model in predicting LSB is briefly reviewed.…”

Section: Introductionmentioning

confidence: 99%

Steady and Time Dependent Study of Laminar Separation Bubble (LSB) behavior along UAV Airfoil RG-15

2023

IJM

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The flow around the Unmanned Arial Vehicle (UAV) operating at a low Reynolds number regime of the O(10 5 ) is predominantly laminar and it leads to the formation of Laminar Separation Bubble (LSB). The pressure, shear stress, and heat flux distribution are considerably affected by LSB, which affects lift, drag, and pitching moment values. Most existing RANS (Reynolds-Averaged Navier-Stokes) turbulence models are built on the assumption of fully turbulent flow. Therefore, these models require additional transport equations or reformulations or specific transition information to predict the LSB observed in low Reynolds number transition flows. Steady and transient computational fluid dynamics simulations were done using the RANS based transition turbulence model to study the behavior of LSB on UAV airfoil RG-15. The transition turbulence model can predict the LSB with considerable accuracy. The steady state and time averaged simulation results are matching in the pre stall region but deviates after stalling. High amplitude velocity fluctuations were observed near regions of transition and separation.

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Section: Introductionmentioning

confidence: 99%