2D experiments and numerical simulation of the oscillatory shallow flow in an open channel lateral cavity

The paper aims to simulate Tsunami currents around moving and fixed structures using the moving-particle semi-implicit method. An open channel with four different sets of structures is employed in the numerical model. The simulation results for the case with one structure indicate that the flow around the moving structure is faster than that around the fixed structure. The flow becomes more complex for cases with additional structures.

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Direct numerical simulation of intermittent turbulence under stably stratified conditions

Nonlinear Processes in Geophysics Discussions ◽

10.5194/npgd-2-179-2015 ◽

2015 ◽

Vol 2 (1) ◽

pp. 179-241 ◽

Cited By ~ 3

Author(s):

P. He ◽

S. Basu

Keyword(s):

Numerical Simulation ◽

Direct Numerical Simulation ◽

Turbulent Flows ◽

Open Channel ◽

Temporal Evolution ◽

Intermittent Turbulence ◽

Bursting Events ◽

Spatio Temporal ◽

Channel Region ◽

Laminar And Turbulent Flows

Abstract. In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified open-channel flows using direct numerical simulation. Clear signatures of this intriguing phenomenon are observed for a range of stabilities. However, the spatio-temporal characteristics of intermittency are found to be strongly stability-dependent. In general, the bursting events are much more frequent near the bottom wall than in the upper-channel region. A steady coexistence of laminar and turbulent flows is detected at various horizontal planes in very stable cases. This spatially intermittent pattern is found to propagate downstream and strongly correlate with the temporal evolution of intermittency. Last, a long standing hypothesis by Blackadar, i.e., the strong connection between local stability and intermittent turbulence, is corroborated by this modeling study.

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Numerical simulation of turbulent flow in open channel with groynes

River Flow 2014 ◽

10.1201/b17133-91 ◽

2014 ◽

pp. 659-665

Author(s):

Th Koutrouveli ◽

N Fourniotis ◽

A Demetracopoulos ◽

A Dimas

Keyword(s):

Numerical Simulation ◽

Turbulent Flow ◽

Open Channel

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2-D Numerical Simulation of Flow in A Curved Open Channel

Advances in Water Resources and Hydraulic Engineering ◽

10.1007/978-3-540-89465-0_153 ◽

2009 ◽

pp. 871-876 ◽

Cited By ~ 3

Author(s):

Gang Zhou ◽

Hong Wang ◽

Xuejun Shao ◽

Dongdong Jia

Keyword(s):

Numerical Simulation ◽

Open Channel

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Simulation Flows Over Hemisphere at the Bed of an Open Channel by DNS and Immersed Boundary Method

Volume 2: Symposia, Parts A, B, and C ◽

10.1115/fedsm2003-45752 ◽

2003 ◽

Author(s):

T. X. Dinh

Keyword(s):

Numerical Simulation ◽

Turbulent Flows ◽

Immersed Boundary Method ◽

Open Channel ◽

Three Dimensional ◽

Turbulent Channel Flow ◽

Time Dependent ◽

Immersed Boundary ◽

Boundary Method ◽

Finite Different Method

The immediate aim of this study is to check the accuracy of Kajishima’s method (one kind of immersed boundary method) for the direct numerical simulation (DNS) of turbulent channel flow over a complicated bed. In this paper, the simulation of three dimensional, time -dependent turbulent flows over a fixed hemisphere at the bed of an open channel is carried out. A finite different method (FDM) is applied with a staggered Cartesian mesh. The forces, the moments about the center of the hemisphere, and the distribution of pressure on the hemisphere in the plane of symmetry are calculated.

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