Evaluation of turbulence models for estimating the wake region of artificial reefs using particle image velocimetry and computational fluid dynamics SCIE SCOPUS

Cited 5 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Evaluation of turbulence models for estimating the wake region of artificial reefs using particle image velocimetry and computational fluid dynamics
Author(s)
Kim, Dongha; Jung, Somi; Na, Won-Bae
KIOST Author(s)
Kim, Dong Ha(김동하)
Alternative Author(s)
김동하
Publication Year
2021-03-01
Abstract
Many studies have evaluated the performance of turbulence models used for computational fluid dynamics (CFD) analysis of artificial reefs (ARs), but an optimal model remains elusive, particularly in terms of wake length and areal estimation. Only a few models were used in previous studies and no report has yet investigated wake shape. We compared five turbulence models and verified the CFD results using particle image velocimetry (PIV). A standard k-epsilon model, renormalization group k-epsilon model, k-omega model, shear stress transportation k-omega model, and Reynolds stress model (RSM) were used. A down-scaled half-ball-type AR was devised and CFD and PIV analyses were performed. Three different inlet velocities (three Reynolds numbers, Re) were considered in each model, and the CFD and PIV results were compared. Wake lengths obtained in the PIV experiments were 1.05 L (Re = 2632), 0.90 L (Re = 5655) and 0.85 L (Re = 8782), respectively. The RSM well-reflected this, especially when Re = 2632 (difference +1%) and Re = 5655 (difference -2%). PIV revealed that all wake regions had unique shapes, reflecting flow divergence (local upwelling) from the end of the wake. Considering such divergent flow, the RSM optimally predicted the overall characteristics of the wake region.
ISSN
0029-8018
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40069
DOI
10.1016/j.oceaneng.2021.108673
Bibliographic Citation
OCEAN ENGINEERING, v.223, 2021
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Artificial reef; Wake region; Turbulence model; PIV measurement; CFD analysis
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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