THERMAL SCIENCE

International Scientific Journal

Hussain H. Al-Kayiem

,

Desmond C. Lim

,

Jundika C. Kurnia

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 reduc¬tion 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 4200-10000, 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 reduce 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 in¬dicating 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
drag reduction, large eddy simulation, Near wall velocity profile, Streamlined riblet, Turbulence control, turbulent channel flow
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
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 5, PAGES [2793 - 2808]
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Large eddy simulation of near-wall turbulent flow over streamlined riblet-structured surface for drag reduction in a rectangular channel

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