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Large-Eddy Simulation of Three-Dimensional Turbulent Free Surface Flow Past a Complex Stream Restoration Structure

Title
Large-Eddy Simulation of Three-Dimensional Turbulent Free Surface Flow Past a Complex Stream Restoration Structure
Author
강석구
Keywords
Free surface flow; Level set method; Immersed boundary method; Large-eddy simulation; Turbulence
Issue Date
2015-10
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
Citation
JOURNAL OF HYDRAULIC ENGINEERING, v. 141, NO 10, Page. 1-11
Abstract
Large-eddy simulation (LES) of a three-dimensional, turbulent free surface flow past a stream restoration structure with arbitrarily complex geometries is presented. The three-dimensional, incompressible, spatially filtered Navier-Stokes and continuity equations are solved in generalized curvilinear coordinates. For the solution of mixed air-water flows, the curvilinear immersed boundary (CURVIB)-level set method developed previously is used and extended to carry out LES. Complex solid geometries are handled by the sharp-interface CURVIB method, and the subgrid scale stress terms arising from the spatial filtering of the Navier-Stokes equations are closed by the dynamic Smagorinsky model. To demonstrate the potential of the CURVIB-LES-level set model for simulating real-life, turbulent free surface flows involving arbitrarily complex geometries, LES is carried out for the flow past a complex rock structure that is fully submerged in water in a laboratory flume. The simulations show that the method is able to predict the time-averaged value as well as the root-mean-square fluctuations of water surfaces with good accuracy. Moreover, it is seen that the free surface flow at a high Froude number causes a significant level of fluctuations of water surface elevation and velocity at the water surface. (C) 2015 American Society of Civil Engineers.
URI
http://ascelibrary.org/doi/10.1061/%28ASCE%29HY.1943-7900.0001034http://hdl.handle.net/20.500.11754/28487
ISSN
0733-9429; 1943-7900
DOI
10.1061/(ASCE)HY.1943-7900.0001034
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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