THERMAL SCIENCE

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Large eddy simulation of near wall turbulent flow over streamlined riblet-structured surface for drag reduction in a rectangular channel

ABSTRACT
Sharkskin-inspired riblets are widely adopted as a passive method for drag reduction of flow over surfaces. In this research, Large Eddy Simulation of turbulent flow over riblet-structured surface in a rectangular channel domain were performed at various Reynolds numbers, ranging from 4,200 to 10,000, to probe the resultant drag change, compared to smooth surface. The changes of mean streamwise velocity gradient in wall-normal direction at varied locations around riblet structures were also investigated to educe mechanisms of streamlined riblet in reducing drag. The computational model is validated by comparing the simulation results against analytical and experimental data, for both smooth and riblet surfaces. Results indicating that the performance of the proposed streamlined riblet shows 7% drag reduction, as maximum, which is higher than the performance of L-shaped riblet with higher wetted surface area. The mean velocity profile analysis indicates that the streamlined riblet structures help to reduce longitudinal averaged velocity component rate in the normal to surface direction of near wall region which leads to laminarization process as fluid flows over riblet structures.
KEYWORDS
PAPER SUBMITTED: 2019-09-09
PAPER REVISED: 2019-11-25
PAPER ACCEPTED: 2020-01-27
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI190909059A
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