The transport of suspended sediment in the wake of a marine hydrokinetic turbine: Simulations via a validated Discrete Random Walk (DRW) model

Javaherchi, Teymour; Aliseda, Alberto

doi:10.1016/j.oceaneng.2016.10.039

The transport of suspended sediment in the wake of a marine hydrokinetic turbine: Simulations via a validated Discrete Random Walk (DRW) model

Journal Article · Sat Nov 05 00:00:00 EDT 2016 · Ocean Engineering

DOI:https://doi.org/10.1016/j.oceaneng.2016.10.039· OSTI ID:1534206

Javaherchi, Teymour ^[1]; Aliseda, Alberto ^[2]

Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering; DOE/OSTI
Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering

The interaction of sediment with Marine Hydrokinetic (MHK) Turbines is studied via turbulent flow simulation coupled with a model for particle dynamics. The Discrete Random Walk (DRW) model is commonly used for simulations of particle dispersion in environmental flows. A method to improve the accuracy of the DRW model in conjunction with RANS simulations of the flow around MHK turbines is presented. A key issues for the use of the DRW model in marine applications is identified, finding the right characteristic eddy lifetime scale, and a simple methodology based on G.I. Taylor's classical dispersion theory is develop to calibrate this physical model parameter. The model is validated against experiments in the literature and the physics of suspended sediment transport in the wake of an MHK turbine is studied with this improved method. The qualitative changes observed in the particle trajectories agree well with theoretical and empirical observations and the quantitive trends allow for comparison of multiple particle cases under different flow conditions, confirming that this implementation of CFD can become a powerful tool to select the most challenging cases, among the thousands of potential studies on the environmental effects of MHK energy, for further study with experiments and pilot projects.

View Accepted Manuscript (DOE)

Research Organization:: Oregon State Univ., Corvallis, OR (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Grant/Contract Number:: FG36-08GO18179

OSTI ID:: 1534206

Alternate ID(s):: OSTI ID: 1416665

Journal Information:: Ocean Engineering, Journal Name: Ocean Engineering Vol. 129; ISSN 0029-8018

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
Discrete Random Walk (DRW)
Marine Hydrokinetic Turbine (MHK)
RANS
eddy time scale constant
particle dispersion
simulation of suspended sediment transport

The transport of suspended sediment in the wake of a marine hydrokinetic turbine: Simulations via a validated Discrete Random Walk (DRW) model

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