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Indexed by:期刊论文

Date of Publication:2012-12-01

Journal:ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS

Included Journals:Scopus、SCIE

Volume:6

Issue:4

Page Number:527-540

ISSN No.:1994-2060

Key Words:artificial reef; numerical simulation; particle image velocimetry measurements; RNG k-epsilon model

Abstract:There are studies of the flow fields of artificial reefs by comprehensive 3D numerical investigations in the literature. In this paper, the flow fields within and around a hollow cube artificial reef are investigated. The complicated three-dimensional unsteady turbulent flow simulation is carried out on the basis of Navier-Stokes solver. A one-phase model is embedded with a renormalization group (RNG) k-epsilon turbulence model and sloved using the method of SIMPLEC algorithm. Free water surface is modeled as a wall boundary condition with zero shear force. The flow fields are solved by employing finite volume method (FVM) simulation. In order to validate the simulated results, non-invasive particle image velocimetry (PIV) measurements are conducted to measure the flow patterns. The comparisons shows a good agreement between the numerical and experimental results concerning the scales and characteristics of the major current arising from the artificial reef. Based on the experimental verification, the effects of variation in reef height on the flow field are simulated and analyzed. Unit artificial reef effect is also calculated and analyzed. According to the numerical results, a better unit artificial reef effect is obtained when the ratio of reef height to water-depth is in the vicinity of 0.2.