contributor author | Sharma, Vikas | |
contributor author | Dutta, Sushanta | |
date accessioned | 2023-08-16T18:16:08Z | |
date available | 2023-08-16T18:16:08Z | |
date copyright | 11/23/2022 12:00:00 AM | |
date issued | 2022 | |
identifier issn | 0098-2202 | |
identifier other | fe_145_02_021207.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4291737 | |
description abstract | Flow alteration using the bio-inspired riblet structure is a fascinating field of study resulting in drag benefits. Riblets have no power requirement being a passive method. This work aims to study the effect of riblets on flow and drag behavior using both experimental and numerical analysis. The experiments are performed using a flush mount shear stress probe (FMSSP) and constant temperature anemometry (CTA). FMSSP is a novel technique to measure stress without obstructing the flow. The study is done on longitudinal streamwise sawtooth-shaped riblet with a maximum Reynolds number (Re) of 1.68 × 105. Three-dimensional numerical modeling of the riblet structure over a smooth wall is analyzed to study the mechanism responsible for drag-reducing behavior. A maximum reduction of 13.2% in shear stress is observed in the study. The result infers an upward shift in the velocity profile relative to the smooth wall in the near-wall region. Due to riblets, large-scale structures breakdown near the wall and better mixing are observed above the surface. Near-wall vortices are imparted a movement away from the wall due to the riblet tip, thus mitigating the near-wall fluctuations. Along with this, drag-reducing riblets hamper the cross-flow near the wall, thus further decreasing the turbulence intensity. Results suggest that turbulent kinetic energy (TKE) has a similar trend to the drag reduction characteristic near the wall. The finding ascertains the potential application of the riblets for real-life settings. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Experimental and Numerical Investigation of Bio-Inspired Riblet for Drag Reduction | |
type | Journal Paper | |
journal volume | 145 | |
journal issue | 2 | |
journal title | Journal of Fluids Engineering | |
identifier doi | 10.1115/1.4056185 | |
journal fristpage | 21207-1 | |
journal lastpage | 21207-15 | |
page | 15 | |
tree | Journal of Fluids Engineering:;2022:;volume( 145 ):;issue: 002 | |
contenttype | Fulltext | |